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Core-shell diamond-graphene needles with silicon-vacancy color centers Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-18 Mariam Maku Quarshie, Sergei Malykhin, and Polina Kuzhir
Color centers in diamond nanostructures open new horizons in biomedicine, offering a biocompatible material platform for sensing temperature, pH, and magnetic field. Covering of the color centers enriched diamonds with graphene shell can essentially extend their application potential. Specifically, under irradiation with ultrashort laser pulses, the highly absorptive graphene shell can be used for
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High-throughput speckle spectrometers based on multifractal scattering media Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-14 Bhupesh Kumar, Yilin Zhu, Luca Dal Negro, and Sebastian A. Schulz
We present compact integrated speckle spectrometers based on monofractal and multifractal scattering media in a silicon-on-insulator platform. Through both numerical and experimental studies we demonstrate enhanced optical throughput, and hence signal-to-noise ratio, for a number of random structures with tailored multifractal geometries without affecting the spectral decay of the speckle correlation
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UV-VIS-NIR absorber to harvest energy for solar thermophotovoltaics Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-14 Sumbel Ijaz, Muhammad Qasim Mehmood, Khaled A. Aljaloud, Rifaqat Hussain, Ali H. Alqahtani, and Akram Alomainy
Ideal ultraviolet-visible-infrared (UV-VIS-NIR) absorbers with consistent performance at elevated temperatures and severe climate conditions are crucial to harvest energy for solar-thermophotovoltaic systems (STPVs). As solar energy promises to fulfill the power demands, its efficient utilization through high-performing light-absorbing devices is inevitable. The requirement of high-temperature durability
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Wavelength-switching performance and thermal lens effect of cryogenic Yb:YAG lasers Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-13 Bing-Tian Lang, Yan-Jie Song, Nan Zong, Zhong-Zheng Chen, Yong Bo, and Qin-Jun Peng
Wavelength-switching performance and thermal lens effect of cryogenic Yb:YAG lasers pumped by a 940 nm laser diode are presented. A maximum continuous wave output power is reached 13.16 W at 80 K with an optic-optic efficiency of 25.6% at an incident pump power of 60 W. The wavelength-switching performance is observed and explained by absorbed pump power threshold behavior as temperature. Moreover
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Temperature measurement and morphological/crystalline differences in the laser-induced carbonization of polydimethylsiloxane Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-14 Masato Kai, Shuichiro Hayashi, Ken Kashikawa, and Mitsuhiro Terakawa
Laser-induced carbonization, which allows for the facile generation of graphitic carbon, is considered a promising technique for fabricating arbitrary conductive microstructures. The morphology and crystallinity of the resulting product are acknowledged to be significantly influenced by laser irradiation conditions. However, unlike discussions pertaining to furnaces where detailed considerations of
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Independently regulating linearly and circularly polarized terahertz wave metasurface Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-11 Jiu-sheng Li, Ruo-tong Huang, and Ri-hui Xiong
We propose a terahertz metasurface that can independently regulate linearly circularly polarized waves. It consists of the top layer “O-O” metal pattern, polyimide layer, middle layer “I” shaped metal pattern, polyimide layer, and metal substrate from top to bottom. By using the phase principle of Pancharatnam Berry (PB) for encoding and arrangement, the metasurface generates vortex beams with different
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Unveiling the potentiality of a self-powered CGT chalcopyrite-based photodetector: theoretical insights Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-12 Md. Islahur Rahman Ebon, Md. Alamin Hossain Pappu, Sheikh Noman Shiddique, and Jaker Hossain
The article demonstrates the design and modelling of CuGaTe2 direct bandgap (1.18 eV) chalcopyrite-based photodetector (PD), which has superb optical and electronic characteristics and shows remarkable performance on the photodetector. The photodetector has been investigated throughout the work by switching width, carrier and defect densities of particular layers and also the interface defect density
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Hybrid Photonics: Integration, Design and Devices feature issue: publisher’s note Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-11 Sébastien Cueff, Joyce Poon, Dries Van Thourhout, and Laurent Vivien
“Invited” was added to the title of a paper [Opt. Mater. Express 14, 862 (2024) [CrossRef] ] in error.
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Narrowband-seeded PPLN non-resonant optical parametric oscillator Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-07 Tugba Temel, Robert T. Murray, Li Wang, Weidong Chen, André Schirrmacher, Ronan A. Battle, and Valentin Petrov
A PPLN non-resonant optical parametric oscillator injection-seeded by narrowband sub-100-mW CW radiation at the signal wavelength produces > 3 W idler average power at 2376 nm for a 20-kHz repetition rate, with a sub-2-nm spectral linewidth. The maximum quantum efficiency reaches 39.5%, roughly 1.4 times higher compared to narrowband operation achieved with a volume Bragg grating at the same pump level
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Random laser emission from dye-doped gain media with optically trapped scattering particles Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-05 Takashi Okamoto, Naomichi Yokoi, and Takashi Kaku
In this study, an optical trapping technique is employed to manipulate the scatterer distribution within a random laser medium. By focusing the trapping beams into small regions within the three-dimensional scattering medium, the scattering particles around them are concentrated in those regions, resulting in an inhomogeneous scatterer distribution. The experimental results show that optical trapping
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Sb2S3 as a low-loss phase-change material for mid-IR photonics Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-04 Adam Biegański, Marko Perestjuk, Rémi Armand, Alberto Della Torre, Capucine Laprais, Guillaume Saint-Girons, Vincent Reboud, Jean-Michel Hartmann, Jean-Hervé Tortai, Antonin Moreau, Julien Lumeau, Thach Nguyen, Arnan Mitchell, Christelle Monat, Sébastien Cueff, and Christian Grillet
We study the mid-IR optical properties of Sb2S3 – a phase-change material (PCM) with high potential for mid-IR integrated photonics. We show that Sb2S3 exhibits a high refractive index contrast Δn ≈ 1 between its two phases and an extinction coefficient k below 10−2 at mid-IR wavelengths (up to ∼10 µm). We study the impact of 100 nm Sb2S3 cladding on SiGe-on-Si waveguides and experimentally show that
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On the applicability of the Maxwell Garnett effective medium model to media with a high density of cylindrical pores Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-05 Julia Brandt, Guido Dittrich, Marc Thelen, Hagen Renner, Patrick Huber, Manfred Eich, and Alexander Petrov
The optical properties of dielectric materials with subwavelength cylindrical pores are commonly described by effective medium models. We compare the Maxwell Garnett and the Bruggeman effective medium models for porous silicon with simulations and experiments for the case of polarization orthogonal to the pore axis. The Maxwell Garnett model matches the results of the simulations even up to very high
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Electro-optical control of polarization in femtosecond-laser written waveguides using an embedded liquid crystal cell Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-04 Kim Lammers, Alessandro Alberucci, Chandroth P. Jisha, Alexander Szameit, and Stefan Nolte
By incorporating a liquid crystal layer into waveguides created through direct laser writing, a tunable waveplate in a fused silica waveguide is successfully realized. In the experiment, a voltage is applied to the birefringent liquid crystal layer, inducing changes in the internal molecular arrangement of the nematic liquid crystal (NLC). Owing to the voltage-induced rotation of the NLC molecules
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Effective medium metasurfaces using nanoimprinting of the refractive index: design, performance, and predictive tolerance analysis Opt. Mater. Express (IF 2.8) Pub Date : 2024-03-04 Matthew Panipinto and Judson D. Ryckman
Production of flat optics incorporating subwavelength features, particularly at visible frequencies, remains a significant challenge. Here, we establish a framework for the design of effective medium metasurfaces (EMM), relying on nanoimprinting of mesoporous silicon to realize a patterned refractive index n(x,y) corresponding to an arbitrary transmitted phase profile ϕ(x,y). The method is used to
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Multiple scattering theory in one dimensional space and time dependent disorder: average field [Invited] Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-29 Alexandre Selvestrel, Julia Rocha, Rémi Carminati, and Romain Pierrat
We theoretically study the propagation of light in one-dimensional space- and time-dependent disorder. The disorder is described by a fluctuating permittivity ε(x, t) exhibiting short-range correlations in space and time, without cross correlation between them. Depending on the illumination conditions, we show that the intensity of the average field decays exponentially in space or in time, with characteristic
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Aperiodicity is more effective than disorder in localizing electromagnetic waves [Invited] Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-29 Luis A. Razo-López, Geoffroy J. Aubry, Felipe A. Pinheiro, and Fabrice Mortessagne
Strong localization of electromagnetic waves in 3D has never been experimentally achieved in uncorrelated disordered systems. By going beyond the paradigm of disordered systems, this goal has been recently reached in deterministic aperiodic planar Vogel spiral arrays in the microwave regime. Here we present a comprehensive description of the experimental details that have been used to observe electromagnetic
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Silicon integrated Bi2TbFe5O12 thin films for O-band nonreciprocal photonic device applications Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-26 Tianchi Zhang, Yucong Yang, Di Wu, Junxian Wang, Zixuan Wei, Wei Yan, and Lei Bi
Silicon photonics for data communication requires key components in the O-band (1260 nm−1310 nm). However, very few studies report silicon integrated magneto-optical thin films operating at this wavelength range. In this study, we report a method to fabricate polycrystalline Bi2Tb1Fe5O12 thin films on silicon substrates for O-band nonreciprocal photonic device applications. The films are fabricated
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Broadband Ag/SiO2/Fe/TiO2 ultrathin planar absorber with a wide acceptance angle from visible to near-infrared regions Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-26 Yuusuke Takashima, Shunsuke Furuta, Kentaro Nagamatsu, Masanobu Haraguchi, and Yoshiki Naoi
We present theoretical and experimental evidences of a broadband ultrathin optical absorber, constructed using Ag(85 nm)/SiO2(70 nm)/Fe(13 nm)/TiO2(60 nm) planar films, with a wide acceptance angle and effective admittance similar to that of air. Calculations show that this system displays near-complete visible to near-infrared absorption owing to admittance matching. The electromagnetic distribution
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GaN/AlN bilayers for integrated photonics Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-28 Nagesh Bhat, Maksym Gromovyi, Moustafa El Kurdi, Xavier Checoury, Benjamin Damilano, and Philippe Boucaud
III-Nitride semiconductors offer a versatile platform for integrated photonic circuits operating from the ultra-violet to the near-infrared spectral range. Either pure AlN or pure GaN waveguiding layers have usually been investigated so far. In this work, we report on the study of GaN/AlN bilayers epitaxially-grown on a sapphire substrate for photonic circuits. Quality factors up to 410,000 are demonstrated
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Photodetection performance of TiS3 nanoribbons studied by optical pump: terahertz probe spectroscopy Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-23 M. I. Paukov, V. V. Bulgakova, Y. G. Goncharov, P. Mishra, A. A. Ushakov, A. V. Syuy, A. A. Arsenin, V. Volkov, K. I. Zaytsev, S. V. Garnov, and M. G. Burdanova
Titanium trisulfide (TiS3) is an important representative of nanomaterials, which are regarded as significant candidates for nanoscale optoelectronics. Due to the promising high intrinsic charge-carrier mobility, it has been proposed as a high performance visible and near-infrared-resistive photodetector with excellent stability. However, the conventional diagnostics of such materials require specific
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Thermally mediated transmission-mode deflection of terahertz waves by lamellar metagratings containing a phase-change material Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-15 Andriy E. Serebryannikov, Akhlesh Lakhtakia, and Ekmel Ozbay
The planewave-response characteristics of simple lamellar metagratings exhibiting thermally mediated transmission-mode deflection (blazing) were numerically investigated, the unit cell of each metagrating containing a phase-change material chosen to be indium antimonide (InSb). Thermal control arises from the use of InSb in its insulator phase and the vicinity of the vacuum state. Metagratings of type
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Structural, chemical, and optical design optimization of an Fe2+-doped chalcogenide fiber for mid-infrared lasing Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-15 Shubham Dawda, Aristide Dogariu, and Kenneth L. Schepler
Optimization of an Fe2+-doped chalcogenide fiber is considered for mid-IR lasing. The concept of using a chalcogenide glass as a fiber matrix to support optically active Fe2+ ions in ZnSe crystal particles requires use of a protective shell to prevent dissolution of the ZnSe particles. Here, we investigate the effect that the shell has on optical scattering and subsequently the relative gain and loss
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Generalized quantum geometric tensor in a non-Hermitian exciton-polariton system [Invited] Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-12 Y.-M. Robin Hu, Elena A. Ostrovskaya, and Eliezer Estrecho
In this work, we review different generalizations of the quantum geometric tensor (QGT) in two-band non-Hermitian systems and propose a protocol for measuring them in experiments. We present the generalized QGT components, i.e., the quantum metric and Berry curvature, for a non-Hermitian hybrid photonic (exciton-polariton) system and show that the generalized non-Hermitian QGT can be constructed from
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Numerical simulation of split ring resonator near-fields and antiferromagnetic magnon hybridization Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-12 Daniel M. Heligman, Alex M. Potts, and R. Valdés Aguilar
We report on the results of finite difference time domain (FDTD) simulations of the terahertz response of a split ring resonator (SRR) metamaterial coupled to a hypothetical antiferromagnetic material (AFM) characterized by a magnon resonance. We find a hybridization of the SRR’s local magnetic field and the magnon, which manifests as an avoided crossing in the far-field transmission spectrum. We show
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Nonlinear refraction and absorption properties of optical materials for high-peak-power long-wave-infrared lasers Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-12 Mikhail N. Polyanskiy, Igor V. Pogorelsky, Marcus Babzien, Konstantin L. Vodopyanov, and Mark A. Palmer
Optical materials transparent in the CO2 laser wavelength range have been evaluated regarding their suitability for components in ultrashort-pulse (≤ a few ps), high-peak-power (≥ a few TW) long-wave infrared (LWIR) lasers. We provide values for the nonlinear refractive index (n2) for seventeen materials, and onsets for nonlinear absorption for eleven materials. Characterizations were performed using
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High-sensitivity tapered fiber relative humidity sensor based on PDMS and GO films Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-12 Heer Yang, Yuanjun Li, Cai Sun, Xuepeng Pan, Shanren Liu, Bo Wang, Mengmeng Gao, Qi Guo, and Yongsen Yu
A new tapered fiber relative humidity (RH) sensor based on polydimethylsiloxane (PDMS) and graphene oxide (GO) film coatings is proposed and demonstrated. Tapered fiber is fabricated in single mode fiber by the tapering machine. The PDMS film is coated on the surface of the fiber using the hydroxide flame sintering technique, while the GO film is deposited using the physical deposition technique. This
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Band structure reconfiguration and surface Faraday rotation in Bi-substituted iron garnets Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-12 Sushree S. Dash, Gregory Odegard, and Miguel Levy
Bismuth-substituted lutetium iron garnets have exhibited a remarkable enhancement in Faraday rotation (FR) for films thinner than 50 nm. A sevenfold amplification in the magneto-optic gyrotropy was found to occur within 2 nm of the air-surface interface at 532 nm wavelength. The present study delves into the underlying physical mechanisms contributing to such amplification. Near-surface changes in
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Iterative technique for computing soliton solutions to periodic nonlinear electrical networks Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-08 Joel Johnson and Cody Scarborough
Solitary waves (solitons) are fundamental modes supported by nonlinear guiding structures and propagate without any distortion due to dispersion. They can be used in the synthesis of waveforms with desired spectral or time-domain characteristics. However, the nonlinearity inherent to solitons complicates their analysis on general guiding structures. This paper proposes an iterative algorithm that can
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Iterative technique for computing soliton solutions to periodic nonlinear electrical networks Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-08 Joel Johnson and Cody Scarborough
Solitary waves (solitons) are fundamental modes supported by nonlinear guiding structures and propagate without any distortion due to dispersion. They can be used in the synthesis of waveforms with desired spectral or time-domain characteristics. However, the nonlinearity inherent to solitons complicates their analysis on general guiding structures. This paper proposes an iterative algorithm that can
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Comparative study on metamaterial-based absorbers made of alloys of titanium powders Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-08 Jing Chen, Anton S. Kupriianov, Vladimir R. Tuz, Orest Ivasishin, and Wei Han
Absorbers are important for many practical applications, from increasing the efficiency of solar cells to aerospace-oriented needs. Among the various types of absorbers, of particular interest are electrically thin absorbers based on metamaterials, suitable for use in harsh environments and being resistant to high temperatures and corrosion. The absorbers made from titanium alloys can satisfy criteria
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Ultraviolet active novel chalcogenides BAlTe2 (B = Rb, Cs): the structural, optoelectronic, mechanical, and vibrational properties for energy harvesting applications through first principles approach Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-07 Rabail Fatima, R. M. Arif Khalil, Muhammad Iqbal Hussain, and Fayyaz Hussain
In this study, ternary aluminum-based chalcogenide materials are discussed since these are found to be very appealing for multifunction devices. Here, the structural, optoelectronic, mechanical, and vibrational properties of RbAlTe2 and CsAlTe2 are observed via density functional theory (DFT). An indirect energy band gap is noted to be increased from 1.33 eV to 1.96 eV for RbAlTe2 and 1.28 eV to 1
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Study of the free carrier characteristics and surface morphology of AlGaAs/GaAs thin films deposited using MOCVD Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-07 Wei Liu, Xiaochuan Ji, Jianglin Dai, Jinlong Zhang, Hongfei Jiao, Xinbin Cheng, and Zhanshan Wang
Ultra-low loss optical thin films find broad applications in fields such as vertical-cavity surface-emitting lasers and optical atomic clocks. The main optical losses in AlGaAs/GaAs distributed Bragg reflectors (DBRs) prepared using metal-organic chemical vapor deposition (MOCVD) arise from absorption loss caused by free carriers within the layers and scattering loss caused by surface roughness. In
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Photonic spheres by microgel templating [Invited] Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-05 Kalpana Manne, Sofia Magkiriadou, Pavel Yazhgur, Ahmet F. Demirörs, and Frank Scheffold
We report on fabricating photonic spheres by combining submicron-sized microgels and silica nanoparticles. By emulsifying the mixture and removing water through solvent drying, we achieve spheres of packed microgels measuring from a few micrometers to tens of micrometers. The highly swollen microgels exert pressure on the surrounding silica nanoparticles, forming a foam-like network within the droplet
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Photonic time crystals: from fundamental insights to novel applications: opinion Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-05 A. Boltasseva, V. M. Shalaev, and M. Segev
In this opinion article, we briefly outline some historical highlights and the most recent developments in the novel and exciting field of photonic time-crystals and present the challenges, disruptive opportunities and potential impact on both the fundamental science of light and on photonic technologies.
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Morphology-dependent terahertz electrical conductivity of liquid-exfoliated graphite Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-30 Harrison Loh, Sunil Gyawali, Konstantinos A. Sierros, and Alan. D. Bristow
Liquid-phase exfoliation (LPE) is a promising and scalable technique to produce low-cost dispersible nanosheets of graphene and nano-graphite for electronic, optoelectronics, and photonics applications. Fundamental information about how LPE affects the electrical properties is lacking. Here, a relationship is provided between the morphology of nano-graphite flakes resulting from LPE and cascade centrifugation
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Giant nonlinear Faraday rotation in iron doped CdMnTe Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-31 Hernando Garcia and Sudhir Trivedi
Polarization rotation is an important parameter in the design of passive and active photonic components (optical isolators, magneto-optical valves, and magnetic field sensors). This effect is particularly important in materials with delocalized electrons and large atomic orbital moments like CdMnTe, which is an excellent candidate due to its large Zeeman splitting that gives rise to large Faraday rotation
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Broadband switchable infrared absorbers using phase-change materials Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-02 Md Tanvir Emrose, Emily L. Payne, Chenglong You, and Georgios Veronis
We introduce multilayer structures with the phase-change material Ge2Sb2Te5 (GST) for use as broadband switchable absorbers in the infrared wavelength range. We optimize both the material composition and the layer thicknesses of the multilayer structures, in order to maximize the difference between the absorption for GST in its crystalline phase and the absorption for GST in its amorphous phase in
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Photonic Materials for THz Light Control: feature issue introduction Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-30 Miguel Navarro-Cía, Juliette Mangeney, Silvia Motti, Teun-Teun Kim, and Igal Brener
We introduce the Optical Materials Express feature issue on Photonic Materials for THz Light Control. This issue comprises a collection of eleven manuscripts and one Opinion on the recent advances in materials, including metamaterials, and the instrumentation to characterize them, for the development of TeraHertz science and engineering.
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Terahertz-capillary electrophoresis (THz-CE) for direct detection of separated substances in solutions Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-29 Keiko Kitagishi, Takayuki Kawai, Masayoshi Tonouchi, and Kazunori Serita
We present a novel technique for capillary electrophoresis (CE) using terahertz (THz) waves, namely “THz-CE,” which enables us to sensitively detect separated substances in a solution flowing in a hollow of capillary whose inner diameter is smaller than 100 µm. Such THz detection could be achieved by utilizing the near-field interaction between a solution filled in a capillary and a point THz source
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Parametric metasurfaces for electromagnetic wave amplification Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-29 Fedor V. Kovalev and Ilya V. Shadrivov
We study parametric amplification of electromagnetic waves using metasurfaces. We design a variable capacitor-loaded metasurface that can amplify incident electromagnetic waves. We analyze various regimes of operation of the system and find that we can achieve a significant gain (over 10 dB) in just one layer of such a structure, and this gain can be controlled by parametric modulation. We study the
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Two-step homogenization of spatiotemporal metasurfaces using an eigenmode-based approach Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-31 Puneet Garg, Aristeidis G. Lamprianidis, Sydur Rahman, Nikolaos Stefanou, Evangelos Almpanis, Nikolaos Papanikolaou, Barbara Verfürth, and Carsten Rockstuhl
Metamaterials are a fascinating class of photonic materials since they allow us to control optical responses (largely) at will. Besides being an intellectual challenge, adding time variations into spatial metamaterials increases the degrees of freedom to tune their effective response, which motivates their exploration. However, to exploit such materials in the future design of functional devices, we
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Trans-reflective tunable color filter using electro-optic material Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-30 Ayesha Kanwal, Ahsan Sarwar Rana, Sadia Noureen, Khaled A. Aljaloud, Ali H. Alqahtani, Rifaqat Hussain, Akram Alomainy, and Muhammad Qasim Mehmood
This research presents designing a tunable trans-reflective color filter utilizing Barium Titanate (BTO) and optimizing its performance by applying an artificial intelligence (AI) based inverse design model. The AI-based color filter design process is efficient and minimizes design challenges. The AI model comprising two sub-blocks is trained using a dataset that correlates geometrical parameters,
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Generation of vector soliton mode-locked Er-doped fiber laser using ZrTe2 as a saturable absorber Opt. Mater. Express (IF 2.8) Pub Date : 2024-02-01 Qiuyan Sheng, Shouqian Tang, Faming Ye, Jinzhe Wang, Yitong Li, Guomei Wang, Caixun Bai, Zhao Li, Cheng Lu, Huanian Zhang, Shenggui Fu, and Wenfei Zhang
We demonstrate a passively mode-locked fiber laser employing zirconium telluride (ZrTe2) as a saturable absorber and illustrate its application for vector soliton generation in erbium-doped fiber lasers. By tuning the pump power and polarization controller, stable mode-locked operations in different operations are obtained with different cavity lengths. In addition, we also further research on characteristics
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Terahertz broadband tunable multifunctional metasurface based on VO2 Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-29 Lingyun Zhuang, Wenjing Zhang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, and Jietao Liu
A switchable multi-function terahertz metasurface employing phase transition material vanadium dioxide (VO2) is presented and investigated. By varying the temperature, the hybrid structure can switch between transmission, absorption, and reflection modes in broadband ranges. When the temperature is below 340 K and VO2 is in the insulating state, perfect polarization conversion is demonstrated. Efficient
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Dual and narrow-band optical filtering and sensing enabled by asymmetric dielectric metagratings Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-26 Aibibula Abudula, Abulizi Abulaiti, Melike Mohamedsedik, Feng Xu, and Paerhatijiang Tuersun
Here, we propose a metagrating structure for dual-and narrow-band optical filtering and sensing in the VIS-NIR regime, comprising two closely spaced, optically thin layers of asymmetric dielectric nanostrip arrays with equal periods but varying nanostrip widths. Based on the numerical simulations, we clarify that the dual-narrow band filtering characteristics in the transmission spectrum is mainly
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Dual and narrow-band optical filtering and sensing enabled by asymmetric dielectric metagratings Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-26 Aibibula Abudula, Abulizi Abulaiti, Melike Mohamedsedik, Feng Xu, and Paerhatijiang Tuersun
Here, we propose a metagrating structure for dual-and narrow-band optical filtering and sensing in the VIS-NIR regime, comprising two closely spaced, optically thin layers of asymmetric dielectric nanostrip arrays with equal periods but varying nanostrip widths. Based on the numerical simulations, we clarify that the dual-narrow band filtering characteristics in the transmission spectrum is mainly
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Optical parameter extraction for metamaterials via robust effective and equivalent medium models Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-26 Ekin Gunes Ozaktas, Sreyas Chintapalli, and Susanna M. Thon
Metamaterials are complex structured mixed-material systems with tailored physical properties that have found applications in a variety of optical and electronic technologies. New methods for homogenizing the optical properties of metamaterials are of increasing importance, both to study their exotic properties and because the simulation of these complex structures is computationally expensive. We
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Evolution of point defects in mechanical cracks of fused silica after CO2 laser melting Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-24 Zhichao Liu, Ting Tan, Feng Geng, Shengfei Wang, Jian Zhang, Hongjun Liu, Qinghua Zhang, Fei Fan, Jian Wang, and Qiao Xu
The traditional polishing method inevitably results in subsurface cracks in the fused silica, which seriously degrades their ultraviolet laser damage resistance. CO2 laser irradiation can melt these cracks and improve their laser induced damage threshold (LIDT). Photoluminescence spectrum and SEM-FIB were employed to investigate the changes in the material microstructure at the crack location with
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Air conditioning for photons [Invited] Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-24 J. B. Pendry
A simple time dependent system is solved analytically taking the form of a moving step-up or step-down in refractive index. We demonstrate that step motion, by a process of compression or expansion, adds or subtracts energy from radiation passing through, so heating or cooling the photons.
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Femtosecond vector vortex laser ablation in tungsten: chiral nano-micro texturing and structuring Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-24 Haruki Kawaguchi, Ryo Yasuhara, Haotian Yang, Chika Hori, Reina Miyagawa, Koji Sugioka, Masato Ota, and Hiyori Uehara
We demonstrate laser-induced periodic surface structure (LIPSS) formation on tungsten with femtosecond vector vortex laser ablation for the first time, and investigate the properties of vector vortex LIPSS by contrasting its properties with Gaussian beam irradiation, and provide some demonstrations of complex microstructuring. The annular intensity profile of vector vortex beams allows LIPSS formation
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Thermo-optic characterization of SU-8 at cryogenic temperature Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-24 Trisha Chakraborty, Oscar A. Jimenez Gordillo, Michael Barrow, Alan R. Kramer, Michal Lipson, Thomas E. Murphy, and Karen E. Grutter
We measured the optical transmission through an SU-8 microring resonator inside a cryostat and analyzed the shift of the resonant wavelengths to determine the thermo-optic behavior around a wavelength of 1600 nm. As the temperature was decreased from room temperature (RT) to 3K, the refractive index of crosslinked SU-8 was measured to increase from 1.571 to 1.584, while the thermo-optic coefficient
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Experimental realization of deep sub-wavelength confinement of light in a topology-optimized InP nanocavity Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-24 Meng Xiong, Rasmus Ellebæk Christiansen, Frederik Schröder, Yi Yu, Laura Nevenka Casses, Elizaveta Semenova, Kresten Yvind, Nicolas Stenger, Ole Sigmund, and Jesper Mørk
We experimentally demonstrate an InP nanocavity with a mode volume of 0.26 (λ/2n)3. This is an order of magnitude smaller than the mode volumes previously demonstrated in photonic crystal point-defect cavities realized in III-V materials and four times smaller than what is often referred to as the diffraction-limited volume, Vλ= (λ/2n)3. The nanocavity is designed using topology optimization, taking
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Investigation on gallium doping Ge-As-S chalcogenide glass and glass ceramics Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-23 Ziqiang Liu, Jierong Gu, Guang Jia, Wenfeng Zheng, Shuangquan Xie, Xiang Shen, and Zijun Liu
In this work, bulk chalcogenide glasses (Ge35As10S55)100-xGax (x = 0,1,3,5,7,9) were prepared using the traditional melt quenching method, and glass ceramics were prepared to improve the mechanical properties through heat treatment. Optical, thermal and mechanical properties of the glass and glass ceramic samples were measured by FTIR, DSC and Vickers hardness analysis. Results indicate that glass
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Modeling and optimization strategies for dye-doped super twisted nematic liquid crystal light valves Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-22 Chien-Tsung Hou, Tsung-Hsien Lin, Xiang-Dong Mi, Mingqian He, and Liang-Chy Chien
This study provides a comprehensive investigation of dye-doped super twisted nematic liquid crystal (DDSTNLC) with the aim of uncovering its potential applications. Using design of experiments (DoE) techniques, we elucidated the relationships between physical variables and constructed a transmission model. We then used Monte Carlo simulations to demonstrate the potential applications of DDSTNLC in
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Intense O + E + S-band emission from Pr3+-doped ZnF2-based glasses Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-22 Jinming Yan, Zhixu Jia, Junjie Wang, Chuanze Zhang, Fangning Wang, Yuting Mei, Fanchao Meng, Yasutake Ohishi, Daming Zhang, Weiping Qin, Fei Wang, and Guanshi Qin
Pr3+-doped ZnF2-based glasses were prepared by using a melt-quenching method in dry N2 atmosphere. Under the excitation of a 588 nm light emitting diode (LED), ultrabroadband emissions ranging from 1245 to 1640 nm were obtained from the Pr3+-doped ZnF2-based glasses, which originate from the transitions 1D2→1G4 (producing E + S-band emission) and 1G4→3H5 (producing O-band emission) of Pr3+. The shape
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Optical activation of implanted lanthanoid ions in aluminum nitride semiconductors by high temperature annealing Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-17 Shin-ichiro Sato, Kanako Shojiki, Ken-ichi Yoshida, Hideaki Minagawa, and Hideto Miyake
Lanthanoid (Ln)-doped aluminum nitride (AlN) semiconductors are one candidate for optoelectric devices and single photon sources, although their optical properties are less understood. We clarify the room temperature optical properties of Ln ion implanted single crystal AlN semiconductors and their changes upon thermal annealing by up to 1700 °C. Photoluminescence (PL), cathodoluminescence (CL), and
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Dry etching of epitaxial InGaAs/InAlAs/InAlGaAs structures for fabrication of photonic integrated circuits Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-17 Sami A. Nazib, Troy A. Hutchins-Delgado, Aadit Sharma, Hosuk Lee, Erum Jamil, Nathan J. Withers, Thomas J. Rotter, Sadhvikas J. Addamane, John Nogan, Anthony R. James, Willard Ross, Douglas V. Pete, Gennady A. Smolyakov, Ganesh Balakrishnan, and Marek Osiński
A dry etching process to transfer the pattern of a photonic integrated circuit design for high-speed laser communications is described. The laser stack under consideration is a 3.2-µm-thick InGaAs/InAlAs/InAlGaAs epitaxial structure grown by molecular beam epitaxy. The etching was performed using Cl2-based inductively-coupled-plasma and reactive-ion-etching (ICP-RIE) reactors. Four different recipes
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Quasi-bound state in the continuum based strong light confinement in graphene metasurfaces Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-17 Mohammad Danaeifar
The bound state in the continuum (BIC) is exploited to metasurfaces for the purpose of arising strong confinement of light and high quality (Q) factor resonances. In this paper, a BIC symmetry-protected metasurface consisting of rectangular graphene patches is synthesized and realistically modeled with intrinsic losses in a far-infrared regime. The quasi-BIC with three asymmetry approaches is applied
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Generation of a sub-wavelength optical needle by wavelength shifting and center masking of a Fresnel zone plate Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-17 Qiang Liu, Yuanhao Deng, Jing Xu, Junli Wang, Wenshuai Liu, and Xiaomin Yao
In this paper, a method to generate a sub-wavelength optical needle is proposed and demonstrated by wavelength shifting and center masking in the Fresnel zone plate (FZP). In theory, the vectorial angular spectrum (VAS) theory combined with genetic algorithm (GA) is used for the design of the center-masking FZP for generating optical needle, and finite-difference time-domain (FDTD) method is used for
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Growth, characterization, and efficient laser operation of Czochralski- and micro-pulling-down-grown Yb3+:YScO3 mixed sesquioxides Opt. Mater. Express (IF 2.8) Pub Date : 2024-01-09 Sascha Kalusniak, Anastasia Uvarova, Ines Arlt, Lena Hülshoff, Patty Eckhof, Philipp Wegener, Mario Brützam, Steffen Ganschow, Christo Guguschev, Hiroki Tanaka, and Christian Kränkel
We report on the growth, spectroscopy and laser operation of Yb3+-doped mixed sesquioxide crystals. Various Yb3+-doped crystals with compositions close to (Y0.5Sc0.5)2O3 have been successfully grown by the Czochralski method and by the micro-pulling down (µ-PD) method. Our spectroscopic investigations reveal broadened stimulated emission and absorption cross-section spectra originating from the structural