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Cancellation of photothermally induced instability in an optical resonator Optica (IF 10.644) Pub Date : 2022-08-11 Jiayi Qin, Giovanni Guccione, Jinyong Ma, Chenyue Gu, Ruvi Lecamwasam, Ben C. Buchler, and Ping Koy Lam
Optical systems are often subject to parametric instability caused by the delayed response of the optical field to the system dynamics. In some cases, parasitic photothermal effects aggravate the instability by adding new interaction dynamics. This may lead to the possible insurgence or amplification of parametric gain that can further destabilize the system. In this paper, we show that the photothermal
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Observation of a triangular-lattice pattern in nonlinear wave mixing with optical vortices Optica (IF 10.644) Pub Date : 2022-08-04 B. Pinheiro da Silva, G. H. dos Santos, A. G. de Oliveira, N. Rubiano da Silva, W. T. Buono, R. M. Gomes, W. C. Soares, A. J. Jesus-Silva, E. J. S. Fonseca, P. H. Souto Ribeiro, and A. Z. Khoury
Preparation, control, and measurement of optical vortices are increasingly important, as they play essential roles in both fundamental science and optical technology applications. Spatial light modulation is the main approach behind the control strategies, although there are limitations concerning the controllable wavelength. It is therefore crucial to develop approaches that expand the spectral range
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Silicon optical phased array with a 180-degree field of view for 2D optical beam steering Optica (IF 10.644) Pub Date : 2022-08-04 Yong Liu and Hao Hu
Optical phased arrays (OPAs), the optical counterpart of phased arrays at radio frequencies, can electronically steer an optical beam without any moving parts. To achieve a 180° field of view (FOV), the array emitters should be spaced a half-wavelength apart or less. However, a conventional OPA based on a waveguide grating array suffers from strong cross talk between adjacent waveguides when the pitch
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Propagation-invariant space-time supermodes in a multimode waveguide Optica (IF 10.644) Pub Date : 2022-08-04 Abbas Shiri, Scott Webster, Kenneth L. Schepler, and Ayman F. Abouraddy
When an optical pulse is spatially localized in a highly multimoded waveguide, its energy is typically distributed among a multiplicity of modes, thus giving rise to a speckled transverse spatial profile that undergoes erratic changes with propagation. It has been suggested theoretically that pulsed multimode fields in which each wavelength is locked to an individual mode at a prescribed axial wavenumber
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Unbalanced-basis-misalignment-tolerant measurement-device-independent quantum key distribution Optica (IF 10.644) Pub Date : 2022-08-03 Feng-Yu Lu, Ze-Hao Wang, Zhen-Qiang Yin, Shuang Wang, Rong Wang, Guan-Jie Fan-Yuan, Xiao-Juan Huang, De-Yong He, Wei Chen, Zheng Zhou, Guang-Can Guo, and Zheng-Fu Han
Measurement-device-independent quantum key distribution (MDIQKD) is a revolutionary protocol since it is physically immune to all attacks on the detection side. However, the protocol still keeps the strict assumptions on the source side that specify that the four BB84 states must be perfectly prepared to ensure security. Some protocols release part of the assumptions in the encoding system to keep
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Single-pulse, reference-free, spatiospectral measurement of ultrashort pulse-beams Optica (IF 10.644) Pub Date : 2022-08-03 David Goldberger, Jonathan Barolak, Charles S. Bevis, Bojana Ivanic, David Schmidt, Yuhao Lei, Peter Kazansky, Giulia F. Mancini, Charles G. Durfee, and Daniel E. Adams
High-intensity pulse-beams are ubiquitous in scientific investigations and industrial applications ranging from the generation of secondary radiation sources (e.g., high harmonic generation, electrons) to material processing (e.g., micromachining, laser-eye surgery). Crucially, pulse-beams can only be controlled to the degree to which they are characterized, necessitating sophisticated measurement
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Attosecond timing jitter from high repetition rate femtosecond “solid-state fiber lasers” Optica (IF 10.644) Pub Date : 2022-07-28 Ruoao Yang, Minghe Zhao, Xingang Jin, Qian Li, Zhangyuan Chen, Aimin Wang, and Zhigang Zhang
Compact, high repetition rate (∼GHz level) femtosecond fiber lasers are attractive for high-precision, high-speed scientific and engineering fields. However, the noise of such a laser seems far higher than low repetition rate ones, which limits its application. Motivated by this challenge, we combined the solid state and the fiber laser into a novel and highly stable “solid-state fiber laser” operating
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Understanding and suppressing backscatter in optical resonators Optica (IF 10.644) Pub Date : 2022-07-28 Matt Jaffe, Lukas Palm, Claire Baum, Lavanya Taneja, Aishwarya Kumar, and Jonathan Simon
Optical cavities have found widespread use in interfacing to quantum emitters. Concerns about backreflection and resulting loss, however, have largely prevented the placement of optics such as lenses or modulators within high-finesse cavities. In this work, we demonstrate a million-fold suppression of backreflections from lenses within a twisted optical cavity. We achieve this by quantitatively exploring
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Probing neuronal functions with precise and targeted laser ablation in the living cortex: comment Optica (IF 10.644) Pub Date : 2022-07-27 Xiao-Xuan Liang and Alfred Vogel
The paper [Optica 8, 1559 (2021) [CrossRef] ] is devoted to probing neuronal functions by targeted cell ablation in living cortex. It demonstrates the advantage of cell ablation by single high-energy pulses from an amplified femtosecond (fs) laser system, which leaves adjacent structures intact. The single-pulse effects rely on mechanical disruption by laser-induced microcavitation, which goes along
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Probing neuronal functions with precise and targeted laser ablation in the living cortex: reply Optica (IF 10.644) Pub Date : 2022-07-27 Zongyue Cheng, Jianian Lin, Yiyong Han, Bowen Wei, Baoling Lai, Baoming Li, Meng Cui, and Wen-Biao Gan
In their comment on Optica 8, 1559 (2021) [CrossRef] , Liang and Vogel performed a theoretical calculation to show that with a 1.1 NA objective and 140 femtosecond (fs) laser pulses with a single pulse energy of 2.2 nJ and 80 MHz repetition rate, the focal point temperature rises 0.3 K and reaches equilibrium after 100 µs in water [Optica 9, 868 (2022) [CrossRef] ]. They suggest that the damage to
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Flexible method for generating needle-shaped beams and its application in optical coherence tomography Optica (IF 10.644) Pub Date : 2022-07-22 Jingjing Zhao, Yonatan Winetraub, Lin Du, Aidan Van Vleck, Kenzo Ichimura, Cheng Huang, Sumaira Z. Aasi, Kavita Y. Sarin, and Adam de la Zerda
Needle-shaped beams (NBs) featuring a long depth-of-focus (DOF) can drastically improve the resolution of microscopy systems. However, thus far, the implementation of a specific NB has been onerous due to the lack of a common, flexible generation method. Here we develop a spatially multiplexed phase pattern that creates many axially closely spaced foci as a universal platform for customizing various
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Gaussian random field generator for simulating partially coherent undulator radiation Optica (IF 10.644) Pub Date : 2022-07-22 Andrei Trebushinin, Gianluca Geloni, Yakov Rakshun, and Svitozar Serkez
Wavefront propagation codes play pivotal roles in the design of optics at synchrotron radiation sources. However, they usually do not account for the stochastic behavior of the radiation field originating from shot noise in the electron beam. We propose a computationally efficient algorithm to calculate a single statistical realization of partially coherent synchrotron radiation fields at a given frequency
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Deterministic measurement of a Rydberg superatom qubit via cavity-enhanced single-photon emission Optica (IF 10.644) Pub Date : 2022-07-22 Chao-Wei Yang, Jun Li, Ming-Ti Zhou, Xiao Jiang, Xiao-Hui Bao, and Jian-Wei Pan
With Rydberg dipole interactions, a mesoscopic atomic ensemble becomes a superatom that behaves like a single atom but couples collectively with photons. It is potentially a strong candidate as a qubit in quantum information science, especially for quantum networks. In this paper, we report a cavity-enhanced single-photon interface for a Rydberg superatom and demonstrate deterministic qubit readout
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Nonlinear multimode photonics: nonlinear optics with many degrees of freedom Optica (IF 10.644) Pub Date : 2022-07-19 Logan G. Wright, William H. Renninger, Demetri N. Christodoulides, and Frank W. Wise
The overall goal of photonics research is to understand and control light in new and richer ways to facilitate new and richer applications. Many major developments to this end have relied on nonlinear optical techniques, such as lasing, mode-locking, and parametric downconversion, to enable applications based on the interactions of coherent light with matter. These processes often involve nonlinear
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Robust and adaptable quantum key distribution network without trusted nodes Optica (IF 10.644) Pub Date : 2022-07-15 Guan-Jie Fan-Yuan, Feng-Yu Lu, Shuang Wang, Zhen-Qiang Yin, De-Yong He, Wei Chen, Zheng Zhou, Ze-Hao Wang, Jun Teng, Guang-Can Guo, and Zheng-Fu Han
Quantum key distribution (QKD) networks are promising to serve large numbers of users with information-theoretic secure communication. In QKD networks, the detection-safe protocol, termed measurement-device-independent (MDI) QKD, can naturally enhance realistic security by supporting untrusted measurement nodes. However, the environmental disturbances to quantum states degrade the performance of multi-user
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Hybrid training of optical neural networks Optica (IF 10.644) Pub Date : 2022-07-14 James Spall, Xianxin Guo, and A. I. Lvovsky
Optical neural networks are emerging as a promising type of machine learning hardware capable of energy-efficient, parallel computation. Today’s optical neural networks are mainly developed to perform optical inference after in silico training on digital simulators. However, various physical imperfections that cannot be accurately modeled may lead to the notorious “reality gap” between the digital
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Monadic Pavlovian associative learning in a backpropagation-free photonic network Optica (IF 10.644) Pub Date : 2022-07-14 James Y. S. Tan, Zengguang Cheng, Johannes Feldmann, Xuan Li, Nathan Youngblood, Utku E. Ali, C. David Wright, Wolfram H. P. Pernice, and Harish Bhaskaran
Over a century ago, Ivan P. Pavlov, in a classic experiment, demonstrated how dogs can learn to associate a ringing bell with food, thereby causing a ring to result in salivation. Today, it is rare to find the use of Pavlovian type associative learning for artificial intelligence applications even though other learning concepts, in particular, backpropagation on artificial neural networks (ANNs), have
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Coherent and ultrashort soft x-ray pulses from echo-enabled harmonic cascade free-electron lasers Optica (IF 10.644) Pub Date : 2022-07-13 Chao Feng, Tao Liu, Si Chen, Kaishang Zhou, Kaiqing Zhang, Zheng Qi, Duan Gu, Zhen Wang, Zenggong Jiang, Xuan Li, Baoliang Wang, Xingtao Wang, Wenyan Zhang, Lie Feng, Chunlei Li, Taihe Lan, Bin Li, Meng Zhang, Haixiao Deng, Dao Xiang, Bo Liu, and Zhentang Zhao
It is a long-standing challenge for laser technologies to generate intense fully coherent pulses in the x-ray regime. Here, we demonstrate an external seeding mechanism, termed echo-enabled harmonic cascade (EEHC) for generating coherent and ultrashort soft x-ray pulses. The mechanism uses echo-enabled harmonic generation as the first stage, producing intense extreme ultraviolet pulses that seed the
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Three-dimensional structure determination of gold nanotriangles in solution using X-ray free-electron laser single-particle analysis Optica (IF 10.644) Pub Date : 2022-07-11 Miki Nakano, Osamu Miyashita, Yasumasa Joti, Akihiro Suzuki, Hideyuki Mitomo, Yoshiya Niida, Ying Yang, Hirokatsu Yumoto, Takahisa Koyama, Kensuke Tono, Haruhiko Ohashi, Makina Yabashi, Tetsuya Ishikawa, Yoshitaka Bessho, Kuniharu Ijiro, Yoshinori Nishino, and Florence Tama
X-ray free-electron lasers (XFELs) have allowed the imaging of nanoscale samples in near-physiological conditions. To achieve three-dimensional (3D) nanostructural reconstruction, many challenges need to be addressed, such as sample delivery for data collection and data processing of noisy diffraction patterns. Here, we provided a demonstration of the 3D structure reconstruction of a gold nanoparticle
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36 Hz integral linewidth laser based on a photonic integrated 4.0 m coil resonator Optica (IF 10.644) Pub Date : 2022-07-07 Kaikai Liu, Nitesh Chauhan, Jiawei Wang, Andrei Isichenko, Grant M. Brodnik, Paul A. Morton, Ryan O. Behunin, Scott B. Papp, and Daniel J. Blumenthal
Laser stabilization sits at the heart of many precision scientific experiments and applications, including quantum information science, metrology, and atomic timekeeping. Many of these systems narrow the laser linewidth and stabilize the carrier by use of Pound–Drever–Hall (PDH) locking to a table-scale, ultrahigh quality factor (Q), vacuum spaced Fabry–Perot reference cavity. Integrating these cavities
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Fluorescent wavefront shaping using incoherent iterative phase conjugation Optica (IF 10.644) Pub Date : 2022-07-05 Dror Aizik, Ioannis Gkioulekas, and Anat Levin
Wavefront shaping correction makes it possible to image fluorescent particles deep inside scattering tissue. This requires determining a correction mask to be placed in both the excitation and emission paths. Standard approaches select correction masks by optimizing various image metrics, a process that requires capturing a prohibitively large number of images. To reduce the acquisition cost, iterative
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Spatiotemporal sampling of near-petahertz vortex fields Optica (IF 10.644) Pub Date : 2022-07-05 Johannes Blöchl, Johannes Schötz, Ancyline Maliakkal, Natālija Šreibere, Zilong Wang, Philipp Rosenberger, Peter Hommelhoff, Andre Staudte, Paul B. Corkum, Boris Bergues, and Matthias F. Kling
Measuring the field of visible light with high spatial resolution has been challenging, as many established methods only detect a focus-averaged signal. Here, we introduce a near-field method for optical field sampling that overcomes that limitation by employing the localization of the enhanced near-field of a nanometric needle tip. A probe field perturbs the photoemission from the tip, which is induced
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High-speed waveguide Ge/Si avalanche photodiode with a gain-bandwidth product of 615 GHz Optica (IF 10.644) Pub Date : 2022-07-05 Yuluan Xiang, Hengzhen Cao, Chaoyue Liu, Jingshu Guo, and Daoxin Dai
High-sensitivity and high-bandwidth receivers are always demanded for high-speed optical link systems. As a key element, an avalanche photodiode (APD) is often regarded as one of the most attractive options for achieving high sensitivity owing to the potential high internal gain. In this paper, a 48-GHz waveguide Ge/Si avalanche photodiode operating at the O-band (1310 nm) is designed with a lateral
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To what extent can space be compressed? Bandwidth limits of spaceplates Optica (IF 10.644) Pub Date : 2022-07-05 Kunal Shastri, Orad Reshef, Robert W. Boyd, Jeff S. Lundeen, and Francesco Monticone
Spaceplates are novel flat-optic devices that implement the optical response of a free-space volume over a smaller length, effectively “compressing space” for light propagation. Together with flat lenses such as metalenses or diffractive lenses, spaceplates have the potential to enable the miniaturization of any free-space optical system. While the fundamental and practical bounds on the performance
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Photon conservation in trans-luminal metamaterials Optica (IF 10.644) Pub Date : 2022-06-29 J. B. Pendry, E. Galiffi, and P. A. Huidobro
Structures that appear to move at or near the velocity of light contain singular points. Energy generated by motion accumulates at these points into ever-narrowing peaks. In this paper, we show that energy is generated by a curious process that conserves the number of photons, adding energy by forcing photons already present to climb a ladder of increasing frequency. We present both a classical proof
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Real-time two-photon interference from distinct molecules on the same chip Optica (IF 10.644) Pub Date : 2022-06-29 Rocco Duquennoy, Maja Colautti, Ramin Emadi, Prosenjit Majumder, Pietro Lombardi, and Costanza Toninelli
Scalability and miniaturization are hallmarks of solid-state platforms for photonic quantum technologies. Still a main challenge is two-photon interference from distinct emitters on chip. This requires local tuning, integration, and novel approaches to understand and tame noise processes. A promising platform is that of molecular single-photon sources. Thousands of molecules with optically tunable
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Spatially multiplexed single-cavity dual-comb laser Optica (IF 10.644) Pub Date : 2022-06-27 J. Pupeikis, B. Willenberg, S. L. Camenzind, A. Benayad, P. Camy, C. R. Phillips, and U. Keller
Single-cavity dual-comb lasers are a new class of ultrafast lasers that have a wide possible application space including pump–probe sampling, optical ranging, and gas absorption spectroscopy. However, to date, laser cavity multiplexing has usually come with a trade-off in laser performance or relative timing noise suppression. We present a method for multiplexing a single laser cavity to support a
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Relative timing jitter in a counterpropagating all-normal dispersion dual-comb fiber laser Optica (IF 10.644) Pub Date : 2022-06-27 Neeraj Prakash, Shu-Wei Huang, and Bowen Li
The counterpropagating all-normal dispersion (CANDi) fiber laser is an emerging high-energy single-cavity dual-comb laser source. Its relative timing jitter (RTJ), a critical parameter for dual-comb timing precision and spectral resolution, has not been comprehensively investigated. In this paper, we enhance the state-of-the-art CANDi fiber laser pulse energy from 1 nJ to 8 nJ. We then introduce a
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Reconfigurable photon localization by coherent drive and dissipation in photonic lattices Optica (IF 10.644) Pub Date : 2022-06-27 O. Jamadi, B. Real, K. Sawicki, C. Hainaut, A. González-Tudela, N. Pernet, I. Sagnes, M. Morassi, A. Lemaître, L. Le Gratiet, A. Harouri, S. Ravets, J. Bloch, and A. Amo
The engineering of localized modes in photonic structures is one of the main targets of modern photonics. An efficient strategy to design these modes is to use the interplay of constructive and destructive interference in periodic photonic lattices. This mechanism is at the origin of the defect modes in photonic bandgaps, bound states in the continuum, and compact localized states in flat bands. Here
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Brillouin backaction thermometry for modal temperature control Optica (IF 10.644) Pub Date : 2022-06-24 Yu-Hung Lai, Zhiquan Yuan, Myoung-Gyun Suh, Yu-Kun Lu, Heming Wang, and Kerry J. Vahala
Stimulated Brillouin scattering provides optical gain for efficient and narrow-linewidth lasers in high-Q microresonator systems. However, the thermal dependence of the Brillouin process as well as the microresonator frequencies impose strict temperature control requirements for long term frequency-stable operation. Here, we study Brillouin backaction and use it to both measure and phase-sensitively
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Interference of two-photon transitions induced by XUV light Optica (IF 10.644) Pub Date : 2022-06-24 M. Žitnik, A. Mihelič, K. Bučar, Š. Krušič, R. Squibb, R. Feifel, I. Ismail, P. Lablanquie, J. Palaudoux, O. Plekan, M. Di Fraia, M. Coreno, M. Manfredda, A. Simoncig, P. Rebernik Ribič, F. Sottocorona, E. Allaria, K. C. Prince, C. Callegari, and F. Penent
The relative phase of first ({\omega _1} ) and third harmonics ({\omega _3} ) extreme ultraviolet light pulses was varied to control the population of the 2{s^2} state in helium through the interference of {\omega _1} + {\omega _1} and {\omega _3} - {\omega _1} two-photon excitation paths. The population was monitored by observing the total electron yield due to the 2{s^2} autoionization decay. Maximum
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Cloaked near-field probe for non-invasive near-field optical microscopy Optica (IF 10.644) Pub Date : 2022-06-21 Felipe Bernal Arango, Filippo Alpeggiani, Donato Conteduca, Aron Opheij, Aobo Chen, Mohamed I. Abdelrahman, Thomas F. Krauss, Andrea Alù, Francesco Monticone, and Laurens Kuipers
Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit, which has been extensively used in biomedical imaging and nanophotonics. However, when the electromagnetic fields under measurement are strongly confined, they can be heavily perturbed by the presence of the near-field probe itself. Here, taking inspiration from scattering-cancellation invisibility
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Photonic integrated circuits with bound states in the continuum: comment Optica (IF 10.644) Pub Date : 2022-06-21 Jiří Čtyroký and Jiří Petráček
We point out that the electro-optic modulation of the bound state in the continuum in a low-index dielectric-loaded slab LiNbO3 waveguide reported by Yu et al., [Optica 6, 1342 (2019) [CrossRef] ] is treated incorrectly. According to our analysis based on both the perturbation approach and numerical simulation, the electro-optic modulation is more than an order of magnitude less efficient than the
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Photonic integrated circuits with bound states in the continuum: erratum Optica (IF 10.644) Pub Date : 2022-06-21 Zejie Yu, Xiang Xi, Jingwen Ma, Hon Ki Tsang, Chang-Ling Zou, and Xiankai Sun
This erratum corrects typographical errors in our previous paper [Optica 6, 1342 (2019) [CrossRef] ].
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Physics-driven deep learning enables temporal compressive coherent diffraction imaging Optica (IF 10.644) Pub Date : 2022-06-17 Ziyang Chen, Siming Zheng, Zhishen Tong, and Xin Yuan
Coherent diffraction imaging (CDI), as a lensless imaging technique, can achieve a high-resolution image with intensity and phase information from a diffraction pattern. To capture high-speed and high-spatial-resolution scenes, we propose a temporal compressive CDI system. A two-step algorithm using physics-driven deep-learning networks is developed for multi-frame spectra reconstruction and phase
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On-chip meta-optics for semi-transparent screen display in sync with AR projection Optica (IF 10.644) Pub Date : 2022-06-17 Yangyang Shi, Chengwei Wan, Chenjie Dai, Shuai Wan, Yang Liu, Chen Zhang, and Zhongyang Li
On-chip integrated meta-optics could enable high-performance, lightweight, and compact integrated photonic devices for augmented reality (AR). Despite previous endeavors in controlling guided waves for holographic phase control, such devices lack versatile performance with the full optical controllability in both amplitude and phase needed to generate multi-functional displays. Here, we propose and
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Self-healing of multipartite entanglement in optical quantum networks Optica (IF 10.644) Pub Date : 2022-06-16 Xutong Wang, Jing Fu, Shengshuai Liu, Yao Wei, and Jietai Jing
Multipartite entanglement serves as an essential resource for constructing quantum networks and makes it possible to realize multi-user quantum information protocols outperforming their classical counterparts. Unfortunately, multipartite entanglement is fragile when distributed in complex environments. Therefore, it is urgent to address the issue of multipartite entanglement decoherence caused by complex
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Idealized four-wave mixing dynamics in a nonlinear Schrödinger equation fiber system Optica (IF 10.644) Pub Date : 2022-06-16 Anastasiia Sheveleva, Ugo Andral, Bertrand Kibler, Pierre Colman, John M. Dudley, and Christophe Finot
The observation of ideal four-wave mixing dynamics is notoriously difficult to implement experimentally due to the generation of higher-order sidebands and optical loss, which limit the potential interaction distance. Here, we overcome this problem with an experimental technique that uses programmable phase and amplitude shaping to iterate the wave mixing initial conditions injected into an optical
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Spin–orbit photonic diode from biomimetic 3D chiral liquid crystal architectures Optica (IF 10.644) Pub Date : 2022-06-15 Gonzague Agez and Etienne Brasselet
Spin–orbit photonic devices usually rely on 2D (transverse) material structuring and are designed for optimal coupling between the polarization state and the spatial degrees of freedom at a given wavelength. Exploiting the third dimension (longitudinal) provides ways to bypass monochromatic limitations. Within a singular optics framework, here we show that chiral liquid crystals endowed with non-singular
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3D-printed fiber-based zeroth- and high-order Bessel beam generator Optica (IF 10.644) Pub Date : 2022-06-10 Innem V. A. K. Reddy, Andrea Bertoncini, and Carlo Liberale
Bessel beams (BBs) have gained prominence thanks to their diffraction-free propagation and self-healing properties. These beams are conventionally generated using different approaches, namely by transforming a narrow circular beam with a lens, using axicons or holographic beam-shaping techniques. These methods involve space-consuming optics. To overcome this limitation, in the past, efforts have been
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Electric-field-resolved near-infrared microscopy Optica (IF 10.644) Pub Date : 2022-06-09 Mikhail Mamaikin, Yik-Long Li, Enrico Ridente, Wei Ting Chen, Joon-Suh Park, Alexander Y. Zhu, Federico Capasso, Matthew Weidman, Martin Schultze, Ferenc Krausz, and Nicholas Karpowicz
Access to the complete spatiotemporal response of matter due to structured light requires field sampling techniques with sub-wavelength resolution in time and space. We demonstrate spatially resolved electro-optic sampling of near-infrared waveforms, providing a versatile platform for the direct measurement of electric field dynamics produced by photonic devices and sub-wavelength structures both in
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Attosecond investigation of extreme-ultraviolet multi-photon multi-electron ionization Optica (IF 10.644) Pub Date : 2022-06-09 M. Kretschmar, A. Hadjipittas, B. Major, J. Tümmler, I. Will, T. Nagy, M. J. J. Vrakking, A. Emmanouilidou, and B. Schütte
Multi-electron dynamics in atoms and molecules very often occur on sub- to few-femtosecond time scales. The available intensities of extreme-ultraviolet (XUV) attosecond pulses have previously allowed the time-resolved investigation of two-photon, two-electron interactions. Here we study double and triple ionization of argon atoms involving the absorption of up to five XUV photons using a pair of intense
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Additive manufacturing for the development of optical/photonic systems and components Optica (IF 10.644) Pub Date : 2022-06-09 Gregory Berglund, Anna Wisniowiecki, John Gawedzinski, Brian Applegate, and Tomasz S. Tkaczyk
The ambition of this review is to provide an up-to-date synopsis of the state of 3D printing technology for optical and photonic components, to gauge technological advances, and to discuss future opportunities. While a range of approaches have been developed and some have been commercialized, no single approach can yet simultaneously achieve small detail and low roughness at large print volumes and
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Inverse design of spontaneous parametric downconversion for generation of high-dimensional qudits Optica (IF 10.644) Pub Date : 2022-06-06 Eyal Rozenberg, Aviv Karnieli, Ofir Yesharim, Joshua Foley-Comer, Sivan Trajtenberg-Mills, Daniel Freedman, Alex M. Bronstein, and Ady Arie
Spontaneous parametric downconversion (SPDC) in quantum optics is an invaluable resource for the realization of high-dimensional qudits with spatial modes of light. One of the main open challenges is how to directly generate a desirable qudit state in the SPDC process. This problem can be addressed through advanced computational learning methods; however, due to difficulties in modeling the SPDC process
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Computational 3D microscopy with optical coherence refraction tomography Optica (IF 10.644) Pub Date : 2022-06-02 Kevin C. Zhou, Ryan P. McNabb, Ruobing Qian, Simone Degan, Al-Hafeez Dhalla, Sina Farsiu, and Joseph A. Izatt
Optical coherence tomography (OCT) has seen widespread success as an in vivo clinical diagnostic 3D imaging modality, impacting areas including ophthalmology, cardiology, and gastroenterology. Despite its many advantages, such as high sensitivity, speed, and depth penetration, OCT suffers from several shortcomings that ultimately limit its utility as a 3D microscopy tool, such as its pervasive coherent
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Spatiotemporal photonic crystals Optica (IF 10.644) Pub Date : 2022-05-25 Yonatan Sharabi, Alex Dikopoltsev, Eran Lustig, Yaakov Lumer, and Mordechai Segev
We study light propagation in spatiotemporal photonic crystals: dielectric media that vary periodically in both space and time. While photonic crystals (spatially periodic media) are well understood, the combination of periodic change in both time and space poses considerable challenges and requires new analysis methods. We find that the band structure of such systems contains energy gaps, momentum
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Soliton microwave oscillators using oversized billion Q optical microresonators Optica (IF 10.644) Pub Date : 2022-05-16 Lu Yao, Peng Liu, Hao-Jing Chen, Qihuang Gong, Qi-Fan Yang, and Yun-Feng Xiao
Microresonator soliton frequency combs offer unique flexibility in synthesizing microwaves over a wide range of frequencies, while their phase noise is currently limited by thermal noise. Enlarging the mode volume would mitigate thermal noise but also raise power consumption. Here, we fabricate optical microresonators with large mode volumes by lathe machining high-purity fiber preforms. Quality factors
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Silicon microring synapses enable photonic deep learning beyond 9-bit precision Optica (IF 10.644) Pub Date : 2022-05-20 Weipeng Zhang, Chaoran Huang, Hsuan-Tung Peng, Simon Bilodeau, Aashu Jha, Eric Blow, Thomas Ferreira de Lima, Bhavin J. Shastri, and Paul Prucnal
Deep neural networks (DNNs) consist of layers of neurons interconnected by synaptic weights. A high bit-precision in weights is generally required to guarantee high accuracy in many applications. Minimizing error accumulation between layers is also essential when building large-scale networks. Recent demonstrations of photonic neural networks are limited in bit-precision due to cross talk and the high
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Exotic interactions mediated by a non-Hermitian photonic bath Optica (IF 10.644) Pub Date : 2022-05-18 Federico Roccati, Salvatore Lorenzo, Giuseppe Calajò, G. Massimo Palma, Angelo Carollo, and Francesco Ciccarello
Photon-mediated interaction between quantum emitters in engineered photonic baths is an emerging area of quantum optics. At the same time, non-Hermitian (NH) physics is currently thriving, spurred by the exciting possibility to access new physics in systems ruled by non-trivial NH Hamiltonians—in particular, photonic lattices—which can challenge longstanding tenets such as the Bloch theory of bands
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Quantum violation of local causality in an urban network using hybrid photonic technologies Optica (IF 10.644) Pub Date : 2022-05-18 Gonzalo Carvacho, Emanuele Roccia, Mauro Valeri, Francesco Basso Basset, Davide Poderini, Claudio Pardo, Emanuele Polino, Lorenzo Carosini, Michele B. Rota, Julia Neuwirth, Saimon F. Covre da Silva, Armando Rastelli, Nicolò Spagnolo, Rafael Chaves, Rinaldo Trotta, and Fabio Sciarrino
Quantum networks play a crucial role in distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Fundamentally, networks with independent sources allow for new forms of nonlocality, beyond the paradigmatic Bell’s theorem. Here we implement the simplest of such networks—the bilocality scenario—in an urban network connecting
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All-optical nanoscopic spatial control of molecular reaction yields on nanoparticles Optica (IF 10.644) Pub Date : 2022-05-16 Wenbin Zhang, Ritika Dagar, Philipp Rosenberger, Ana Sousa-Castillo, Marcel Neuhaus, Weiwei Li, Sharjeel A. Khan, Ali S. Alnaser, Emiliano Cortes, Stefan A. Maier, Cesar Costa-Vera, Matthias F. Kling, and Boris Bergues
Molecular adsorbate reactions on nanoparticles play a fundamental role in areas such as nano-photocatalysis, atmospheric, and astrochemistry. They can be induced, enhanced, and controlled by field localization and enhancement on the nanoparticle surface. In particular, the ability to perform highly controlled near-field-mediated reactions is key to deepening our understanding of surface photoactivity
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Terahertz-wave decoding of femtosecond extreme-ultraviolet light pulses Optica (IF 10.644) Pub Date : 2022-05-13 I. Ilyakov, N. Agarwal, J.-C. Deinert, J. Liu, A. Yaroslavtsev, L. Foglia, G. Kurdi, R. Mincigrucci, E. Principi, G. Jakob, M. Kläui, T. S. Seifert, T. Kampfrath, S. Kovalev, R. E. Carley, A. O. Scherz, and M. Gensch
In recent years, femtosecond extreme-ultraviolet (XUV) and x-ray pulses from free-electron lasers have developed into important probes to monitor processes and dynamics in matter on femtosecond-time and angstrom-length scales. With the rapid progress of versatile ultrafast x-ray spectroscopy techniques and more sophisticated data analysis tools, accurate single-pulse information on the arrival time
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In vitro and in vivo NIR fluorescence lifetime imaging with a time-gated SPAD camera Optica (IF 10.644) Pub Date : 2022-05-09 Jason T. Smith, Alena Rudkouskaya, Shan Gao, Juhi M. Gupta, Arin Ulku, Claudio Bruschini, Edoardo Charbon, Shimon Weiss, Margarida Barroso, Xavier Intes, and Xavier Michalet
Near-infrared (NIR) fluorescence lifetime imaging (FLI) provides a unique contrast mechanism to monitor biological parameters and molecular events in vivo. Single-photon avalanche diode (SPAD) cameras have been recently demonstrated in FLI microscopy (FLIM) applications, but their suitability for in vivo macroscopic FLI (MFLI) in deep tissues remains to be demonstrated. Herein, we report in vivo NIR
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Resonant and phonon-assisted ultrafast coherent control of a single hBN color center Optica (IF 10.644) Pub Date : 2022-05-09 Johann A. Preuss, Daniel Groll, Robert Schmidt, Thilo Hahn, Paweł Machnikowski, Rudolf Bratschitsch, Tilmann Kuhn, Steffen Michaelis de Vasconcellos, and Daniel Wigger
Single-photon emitters in solid-state systems are important building blocks for scalable quantum technologies. Recently, quantum light emitters have been discovered in the wide-gap van der Waals insulator hexagonal boron nitride (hBN). These color centers have attracted considerable attention due to their quantum performance at elevated temperatures and wide range of transition energies. Here, we demonstrate
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Cascaded nanobeam spectrometer with high resolution and scalability Optica (IF 10.644) Pub Date : 2022-05-05 Jiahui Zhang, Ziwei Cheng, Jianji Dong, and Xinliang Zhang
An on-chip reconstruction spectrometer provides a powerful approach for miniaturized and portable applications. Owing to the cross-correlation and line shape of broadband responses, the reconstruction spectrometer exhibits limited resolution and a fixed bandwidth. Here we demonstrate a cascaded nanobeam spectrometer with assistance of a reconstruction algorithm. The transmissions of tunable Fano-enhanced
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Flat magic window Optica (IF 10.644) Pub Date : 2022-05-05 Felix Hufnagel, Alessio D’Errico, Hugo Larocque, Fatimah Alsaiari, Jeremy Upham, and Ebrahim Karimi
Magic windows (or mirrors) consist of optical devices with a surface deformation or thickness distribution devised in such a way to form a desired image. The associated image intensity distribution has been shown in previous works to be related to the Laplacian of the height of the surface relief. Exploiting the Laplacian theory to calculate the needed phase pattern, we experimentally realize such
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Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation Optica (IF 10.644) Pub Date : 2022-05-04 Christian Heide, Yuki Kobayashi, Amalya C. Johnson, Fang Liu, Tony F. Heinz, David A. Reis, and Shambhu Ghimire
Under strong electromagnetic excitation, electron–hole (e-h) pairs may be generated in solids, which are subsequently driven to high energy and high momentum, producing high harmonics (HH) of the driving field. The HH efficiency depends on the degree of coherence between the driven electron and hole created by the laser field. Here, we disrupt this e-h coherence in an atomically thin semiconductor
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Dipole-spread-function engineering for simultaneously measuring the 3D orientations and 3D positions of fluorescent molecules Optica (IF 10.644) Pub Date : 2022-05-03 Tingting Wu, Jin Lu, and Matthew D. Lew
Interactions between biomolecules are characterized by where they occur and how they are organized, e.g., the alignment of lipid molecules to form a membrane. However, spatial and angular information are mixed within the image of a fluorescent molecule–the microscope’s dipole-spread function (DSF). We demonstrate the pixOL algorithm to simultaneously optimize all pixels within a phase mask to produce
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Quantum phase modulation with acoustic cavities and quantum dots Optica (IF 10.644) Pub Date : 2022-04-29 Poolad Imany, Zixuan Wang, Ryan A. DeCrescent, Robert C. Boutelle, Corey A. McDonald, Travis Autry, Samuel Berweger, Pavel Kabos, Sae Woo Nam, Richard P. Mirin, and Kevin L. Silverman
Fast, efficient, and low-power modulation of light at microwave frequencies is crucial for chip-scale classical and quantum processing as well as for long-range networks of superconducting quantum processors. A successful approach to bridge the gap between microwave and optical photons has been to use intermediate platforms, such as acoustic waves, that couple efficiently to a variety of quantum systems
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Terahertz electrometry via infrared spectroscopy of atomic vapor Optica (IF 10.644) Pub Date : 2022-04-29 Shuying Chen, Dominic J. Reed, Andrew R. MacKellar, Lucy A. Downes, Nourah F. A. Almuhawish, Matthew J. Jamieson, Charles S. Adams, and Kevin J. Weatherill
In recent years, the characterization of radiation falling within the so-called “terahertz (THz) gap” has become an ever more prominent issue due to the increasing use of THz systems in applications such as nondestructive testing, security screening, telecommunications, and medical diagnostics. THz detection technologies have advanced rapidly, yet traceable calibration of THz radiation remains challenging