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  • A method of depth extension in 3D shape measurement by geometric constraints
    J. Opt. (IF 2.379) Pub Date : 2020-10-30
    Shenzhen Lv, Yuyuan Zhang, Jian Wang and Qiang Sun

    In this paper a new method to extend the measurement depth limited by geometric constraints for objects with large depth variances is presented. This method mainly includes the following steps: (1) using the watershed image segmentation algorithm to extract the correct part of the discontinuous absolute phase distribution obtained by geometric constraints, and making a binary mask of the correspondent

    更新日期:2020-10-30
  • Wolf effect in the scattering of polychromatic radiation by two spheres having parity-time symmetry
    J. Opt. (IF 2.379) Pub Date : 2020-10-30
    R A Vieira and P A Brandão

    It was recently proposed (P A Brandão and S B Cavalcanti 2019 Phys. Rev. A 100 043822) that two small (Dirac) scatterers, one having gain and the other having loss, drastically modifies the spectral density of the scattered radiation field. Here, we extend this previous work by studying the scattering of stochastic radiation by two finite spheres having gain and loss, satisfying the parity-time symmetry

    更新日期:2020-10-30
  • Hybrid real- and reciprocal-space full-field imaging with coherent illumination
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    Po-Nan Li, Soichi Wakatsuki, Piero A Pianetta and Yijin Liu

    We present a novel diffractive imaging method that harnesses a low-resolution real-space image to guide the phase retrieval. A computational algorithm is developed to utilise such prior knowledge as a real-space constraint in the iterative phase retrieval procedure. Numerical simulations and proof-of-concept experiments are carried out, demonstrating our method’s capability of reconstructing high-resolution

    更新日期:2020-10-30
  • High-resolution computer-generated hologram for creating 2D images with kinematic effects of motion
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    Anton Goncharsky and Svyatoslav Durlevich

    A new method is proposed for computing the microrelief of phase diffractive optical elements (DOEs) forming 2D images with kinematic effects of motion. The DOE is subdivided into elementary areas with a size of approximately 50 microns. The synthesis of optical security elements includes the computation of the beam pattern in each elementary area. The beam pattern in each elementary area uniquely defines

    更新日期:2020-10-30
  • Nonlinear control of polarization rotation of hybrid-order vector vortex beams
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    Dajin Luo, Huajie Hu, Churong Pan, Yingxin Zhang, Yan Qin, Haixia Chen, Dong Wei, Hong Gao and Fuli Li

    Vector vortex beams are widely concerned for their application prospects in various fields. Here we study the polarization rotation of hybrid-order vector vortex beam (HVVB) in hot atomic vapor both theoretically and experimentally. In this work, the HVVB is experimentally generated by combining two q-plates with a polarization beam splitter, and this method is verified by analyzing Jones vector based

    更新日期:2020-10-30
  • A ray-trace analysis of x-ray multilayer Laue lenses for nanometer focusing
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    H N Chapman and S Bajt

    Thick diffractive optical elements offer a promising way to achieve focusing or imaging at a resolution approaching 1 nm for x-ray wavelengths shorter than about 0.1 nm. Efficient focusing requires that these are fabricated with structures that vary in period and orientation so that rays obey Bragg’s law over the entire lens aperture and give rise to constructive interference at the focus. Here the

    更新日期:2020-10-30
  • Optical multimodal biometric encryption that uses digital holography
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    Sudheesh K Rajput and Osamu Matoba

    In this paper, we propose an optical multimodal biometric encryption technique which uses digital holography (DH) for multiple biometric recording and successive optical encryption methods, by means of keys generated from biometric data. Physiological biometrics, such as fingerprints or iris scans, along with behavioral biometrics such as voice, are recorded simultaneously as multimodal biometrics

    更新日期:2020-10-30
  • Symmetric and antisymmetric multipole electric-magnetic fano resonances in elliptic disk- nonconcentric split ring plasmonic nanostructures
    J. Opt. (IF 2.379) Pub Date : 2020-10-27
    Xingfang Zhang, Fengshou Liu, Xin Yan, Lanju Liang and Dequan Wei

    A plasmonic nanostructure composed of a displaced elliptical disk in a nonconcentric split ring is proposed and investigated theoretically by the finite difference time domain method. The simulated scattering spectra and electric field distributions reveal that multiple Fano resonances can be formed due to the destructive interference of the longitudinal dipole mode of the disk and multiple multipole

    更新日期:2020-10-30
  • Stability analysis of the optical field and spectrum characteristics inside the dual coupled microcavities
    J. Opt. (IF 2.379) Pub Date : 2020-10-20
    Xin Xu, Xueying Jin, Yang Lu, Haoran Gao, Jie Cheng and Liandong Yu

    For improving the energy conversion efficiency from the pump to the available optical field in the microcavity, the dual coupled microcavities are proposed. Based on the coupled nonlinear Schrödinger equations, the optical field and spectrum characteristics inside the dual coupled microcavities can be studied, and the effect of the each parameter on the field is analyzed. Simulation results indicate

    更新日期:2020-10-30
  • Elementary branching: waves, rays, decoherence
    J. Opt. (IF 2.379) Pub Date : 2020-10-20
    M V Berry

    The ‘elementary particle’ of branched flow is the splitting of waves and rays into localised branches at an individual cusped caustic. Localisation is the result of noise in the incident beam: decoherence for waves, here modelled analytically by random phases, or irregularity in the rays, here modelled by transverse smoothing. The two models coincide as the localisation emerges with increasing noise

    更新日期:2020-10-30
  • Tunable optical metasurfaces enabled by chalcogenide phase-change materials: from the visible to the THz
    J. Opt. (IF 2.379) Pub Date : 2020-10-14
    C Ruiz de Galarreta, S G-C Carrillo, Y-Y Au, E Gemo, L Trimby, J Shields, E Humphreys, J Faneca, L Cai, A Baldycheva, J Bertolotti and C D Wright

    Metasurfaces and nanoantennas are redefining what can be achieved in terms of optical beam manipulation, as they provide a versatile design platform towards moulding the flow of light at will. Yet, once a conventional metasurface is designed and realised, its effect on optical beams is repeatable and stationary, thus its performance is ‘locked-in’ at the fabrication stage. A much wider range of applications

    更新日期:2020-10-16
  • Employing vanadium dioxide nanoparticles for flexible metasurfaces with switchable absorption properties at near-infrared frequencies
    J. Opt. (IF 2.379) Pub Date : 2020-10-14
    Byoungsu Ko, Trevon Badloe, Soo-Jung Kim, Sung-Hoon Hong and Junsuk Rho

    Using the simple interference interactions in a three-layer thin film structure, absorbers in the near infrared with aesthetically pleasing reflective colouration were designed, fabricated, and characterised. By implementing the phase change material, vanadium dioxide (VO 2 ), with its remarkable phase change properties, the absorbers are able to be switched between lower and higher absorption states

    更新日期:2020-10-16
  • Determination of spatial quantum states by using point diffraction interferometry
    J. Opt. (IF 2.379) Pub Date : 2020-10-14
    Quimey Pears Stefano, Lorena Rebón and Claudio Iemmi

    We present a method to reconstruct pure spatial qudits of arbitrary dimension d , which is based on a point diffraction interferometer. In the proposed scheme, the quantum states are codified in the discretized transverse position of a photon field, once they are sent through an aperture consisting in d rectangular regions, with an extra region that provides a phase reference. To characterize these

    更新日期:2020-10-16
  • Quantum optical response of a hybrid optomechanical device embedded with a qubit
    J. Opt. (IF 2.379) Pub Date : 2020-10-14
    Sabur A Barbhuiya and Aranya B Bhattacherjee

    We theoretically investigate the optical response in a hybrid quantum optomechanical system consisting of two optically coupled micro-cavities in which a two-level system (qubit) is coupled with a mechanical membrane. The qubit can either be a defect which interacts with the mechanical oscillator via the linear Jaynes–Cummings interaction or a superconducting charge qubit coupled with the mechanical

    更新日期:2020-10-16
  • Evolution of phase singularities of Laguerre–Gaussian Schell-model vortex beam
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Jiao Wang, Xizheng Ke and Mingjun Wang

    In free space optical communication, the type and quality of the light source are very important. In this paper, we introduce a vortex class of partially coherent sources of Schell type with a Laguerre–Gaussian Schell-model vortex (LGSMV) beam, which is the product of the dark hollow Laguerre–Gaussian Schell-model beam (2013 Opt. Lett. 38 91) passing through a spiral phase modulator. We study the characteristics

    更新日期:2020-10-14
  • Reduction of response time in transmissive optically addressed spatial light modulator using solution-based ZnO NP/PEDOT:PSS heterojunction
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Xin Chang, Jin Li, Pawan Kumar Shrestha, Shunpu Li, Kasia Surowiecka and Daping Chu

    An optically addressed spatial light modulator (OASLM) works by using the intensity of a ‘write’ light to modulate the phase of a ‘read’ light. OASLM using ZnO nanoparticles (NPs) as a photoconductor is important to holographic displays because of its record-high spatial resolution. However, its response time to the write light is long and the switch-off time (τ off ) can take tens of seconds due to

    更新日期:2020-10-14
  • Formation of polarization singularity lattice through dual-phase modulation
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Praveen Kumar, Sushanta Kumar Pal, Naveen K Nishchal and P Senthilkumaran

    In this paper, we demonstrate the generation of different singularity lattices consisting of only V-points or only C-points using a versatile method based on double phase modulation. Overcoming the inherent problems with interferometry, the proposed approach utilizes a spatial light modulator for modulating the phase distributions of evaluated interference field into the light beams. This concept is

    更新日期:2020-10-14
  • Single-frequency, pulsed Yb 3+ -doped multicomponent phosphate power fiber amplifier
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Enkeleda Balliu, Nadia G Boetti, Diego Pugliese, Joris Lousteau, Magnus Engholm, Daniel Milanese and Hans-Erik Nilsson

    High-power, single-frequency, pulsed fiber amplifiers are required in light detection and ranging, coherent laser detection, and remote sensing applications to reach long range within a short acquisition time. However, the power-scaling of these amplifiers is limited by nonlinearities generated in the optical fibers, in particular by stimulated Brillouin scattering (SBS). In this regard, the use of

    更新日期:2020-10-14
  • Hidden singularities in 3D vector fields
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Xiaoyan Pang, Chen Feng, Bujinlkham Nyamdorj and Xinying Zhao

    In this article we show that in a three dimensional (3D) optical vector field there exist two types of hidden singularities, one is spin density (SD) phase singularity and the other is SD vector singularity, which are both unique to 3D fields. The nature of these SD singularities is discussed and their connection with traditional optical singularities is also examined. Especially it is shown that in

    更新日期:2020-10-14
  • Limitations and potentials of generalized Veselago-Pendry lenses
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Hayrettin Odabasi

    We study the imaging performance of anisotropic generalized Veselago–Pendry (GVP) lenses derived via complex transformation optics technique. The derived material tensors of such generalized lenses can be controlled via a complex coordinate transformation parameter resulting in an anisotropic constitutive tensor with loss/gain characteristics. We discuss their limitations and potentials based on the

    更新日期:2020-10-14
  • Diffraction losses of a Fabry-Perot cavity with nonidentical non-spherical mirrors
    J. Opt. (IF 2.379) Pub Date : 2020-10-13
    Mikhail V Poplavskiy, Andrey B Matsko, Hiroaki Yamamoto and Sergey P Vyatchanin

    Optical cavities, with both optimized resonant conditions and high quality factors, are important metrological tools. In particular, they are used for laser gravitational wave (GW) detectors. In order to have high cavity powers in GW detectors, it is necessary to suppress the parametric instability and to reduce the loss in the arm caused by point absorbers by damping the resonant conditions of harmful

    更新日期:2020-10-14
  • Control of surface plasmon-polaritons at interfaces between triple quantum dots and nanocomposites
    J. Opt. (IF 2.379) Pub Date : 2020-10-09
    Habibur Rahman, Iftikhar Ahmad, Rafi Ud Din, Guo-Qin Ge and Hazrat Ali

    Surface plasmon-polariton (SPPs) at the interface between a nanocomposite material and a medium, in which triple quantum dots (QDs) are uniformely embedded, are theoretically investigated. The absorption and dispersion spectra of SPPs are shown to have interesting behavior in the proposed system. The plasmonic spectra can be efficiently controlled via gate voltages applied in the triple QD as well

    更新日期:2020-10-12
  • Single-shot incoherent color digital holographic microscopy system with static polarization-sensitive optical elements
    J. Opt. (IF 2.379) Pub Date : 2020-10-05
    Tatsuki Tahara, Tomoyoshi Ito, Yasuyuki Ichihashi and Ryutaro Oi

    We propose a digital holographic microscope for the single-shot multicolor three-dimensional (3D) image sensing of specimens illuminated by spatially and temporally incoherent white light. The proposed microscope exploits self-interference, single-shot phase-shifting incoherent digital holography, a polarization-imaging color image sensor, and static polarization-sensitive optical elements to generate

    更新日期:2020-10-06
  • An anamorphic time-lens-based optical cryptosystem for protection of time-varying signals
    J. Opt. (IF 2.379) Pub Date : 2020-10-05
    Mingqing Wang and Shuqin Lou

    The similarity between in-plane directions of spatial optics and overlapped time ranges of temporal optics is introduced as a new rule of the space–time duality. Applying this rule, an optical dual random phase encoding (DRPE) cryptosystem in the temporal anamorphic fractional Fourier transform (TAFrFT) domain is proposed for physical-level protection of time-varying signals. The structure of a TAFrFT

    更新日期:2020-10-06
  • Accurate phase analysis of interferometric fringes by the spatiotemporal phase-shifting method
    J. Opt. (IF 2.379) Pub Date : 2020-10-05
    Shien Ri, Taiki Takimoto, Peng Xia, Qinghua Wang, Hiroshi Tsuda and Shinji Ogihara

    Phase-shifting interferometry (PSI) has been widely applied in the field of accurate optical methodology. However, the fluctuation of background and amplitude intensities due to the instability of laser source, and phase-shifting error or vibration are significant problems for the PSI. In this study, the spatiotemporal phase-shifting method (ST-PSM) (Ri S et al 2019 J. Opt. 21 095702), which is a highly

    更新日期:2020-10-06
  • Design and development of laser speckle reduction device using waveguide diffuser and pyramidal cavity for projection imaging
    J. Opt. (IF 2.379) Pub Date : 2020-10-01
    Virendra Kumar, Mayank Gupta, Atul Kumar Dubey, Shilpa Tayal, Veena Singh and Dalip Singh Mehta

    We report the design and development of an efficient speckle reduction device for projection imaging. The device is composed of a combination of a rod-shaped waveguide diffuser and a reflective pyramidal cavity. The simulation results reveal that the pyramidal cavity with waveguide diffuser is a highly efficient light guide comparable to the other conventional light guides. Further, the device was

    更新日期:2020-10-02
  • Optical force acting on a particle in a reverse energy flow near the focus of a gradient lens
    J. Opt. (IF 2.379) Pub Date : 2020-10-01
    Anton G Nalimov, Sergey S Stafeev and Victor V Kotlyar

    We show that if a dielectric nanoparticle (with a diameter of ∼70 nm) is placed on the optical axis near the surface (at a distance of less than 100 nm) of a high-aperture silicon gradient microlens with a refractive index in the form of a hyperbolic secant, and the lens is illuminated by laser radiation with a wavelength of 1.55 μ m, then the particle is attracted to the lens surface with a force

    更新日期:2020-10-02
  • Parity-time symmetry and asymmetric diffraction of light in four-level triple quantum wells
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Rohit Mukherjee and S Konar

    In this paper, we investigate two-dimensional parity-time (PT) symmetry and electromagnetically induced grating (EIG) in four-level asymmetric triple quantum wells (QWs). Here, PT-symmetry and EIG are realized by appropriately varying the detuning value of the probe, and the modulation amplitudes of a coupling field and standing wave (SW) pump. By virtue of its PT symmetry, the EIG asymmetrically diffracts

    更新日期:2020-09-23
  • Scanning microsphere array optical microscope for efficient and large area super-resolution imaging
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Ji Zhou, Zhaoxin Lian, Chengjia Zhou, Shusheng Bi and Yuliang Wang

    Dielectric microsphere based super-resolution imaging is a promising approach to overcome the diffraction limit of imaging in an optical microscope. So far, it still remains as a challenge to efficiently implement super-resolution imaging in a large area in a controlled manner. In this study, a home-designed imaging probe which consists of a microsphere array is applied to implement scanning of sample

    更新日期:2020-09-23
  • A proposal for a multi-functional tunable dual-band plasmonic absorber consisting of a periodic array of elliptical grooves
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Behrokh Beiranvand and Alexander S Sobolev

    In this paper, a tunable plasmonic absorber composed of an elliptically grooved metallic film sandwiched between two dielectric layers is presented. To understand the optical response of the structure, its absorption spectrum and resonance modes profiles are numerically calculated using computer simulation technology microwave studio. It is shown that the proposed device can provide two absorption

    更新日期:2020-09-23
  • Survey of autonomous gas leak detection and quantification with snapshot infrared spectral imaging
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Nathan Hagen

    We survey the current state of the art in industrial gas sensing, explaining how existing sensing techniques estimate gas concentration, column density, total volume, and leak rate. We especially focus on the application of snapshot infrared spectral imaging to gas detection and quantification, as this is the newest of the available techniques. After discussing the strengths and weaknesses of each

    更新日期:2020-09-23
  • Axial resolution and contrast enhancement in digital scanned light-sheet microscopy via stimulated emission depletion
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Suhui Deng, Xianhong Li, Zijun Ding, Yulong Zhang, Mingping Liu, Huilin Zhou and Yuhao Wang

    Integration of stimulated emission depletion (STED) with digital scanned light-sheet microscopy (DSLM) using a Bessel beam achieves fast, high-resolution and large field of view (FOV) imaging. Here, we report on a combination method of DSLM and STED by using a Bessel beam for excitation and a hollow Gaussian beam for depletion. Owing to the advantages of confined axial distribution around the focal

    更新日期:2020-09-23
  • Automatic mode-matching of a Fabry-Pérot cavity with a single photodiode and spatial light modulation
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    D Tarquin Ralph, Paul A Altin, David S Rabeling, David E McClelland and Daniel A Shaddock

    Conventional cavity alignment sensing uses multi-element photodiodes to sense the matching of a laser beam to the mode of a cavity. We present a new approach that uses a single-element photodiode combined with deformable mirrors to modulate orthogonal codes across distinct spatial regions of the laser wavefront. By decoding the photodiode signal it is possible to map the mode mismatch and produce error

    更新日期:2020-09-23
  • A silicon-on-insulator single-arm Mach-Zehnder interferometer (SAMZI) modulator
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    David E Hagan, Jackson Tarlin and Andrew P Knights

    We demonstrate a single-arm Mach-Zehnder interferometer (SAMZI) modulator based on asymmetric long-period gratings for TE 0 -TE 1 mode conversion integrated with a p-n junction doped waveguide for relative phase modulation between these modes via the electro-optic effect. The device consists of two long-period grating sections, with the active waveguide modulator section in-between, and inverse tapers

    更新日期:2020-09-23
  • Complex field sensing in strong scintillations with multi-aperture phase contrast techniques
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Behzad Bordbar and Mikhail A Vorontsov

    A new class of multi-aperture phase contrast (MAPCO) complex field sensor is introduced and analyzed using wave-optics numerical simulations. The presented analysis of the MAPCO technique demonstrates a potential for high-resolution (256 × 256 pixels) complex field sensing under strong input field intensity scintillations with sub-msec phase retrieval frame rates.

    更新日期:2020-09-23
  • High-accuracy inverse optical design by combining machine learning and knowledge-depended optimization
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Shikun Zhang, Liheng Bian and Yongyou Zhang

    With respect to knowledge-dependent approaches (KDAs) that require optimization in the high-dimensional parameter space, data-driven methods (DDMs) show remarkable generalization and diversity but commonly with unsatisfactory accuracy for complex systems. To overcome the imperfections of the KDAs and DDMs, we suggest a composite scheme by combining them, which not only alleviates the optimization burden

    更新日期:2020-09-23
  • Fourth-order moment of the light field in atmosphere
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    R A Baskov and O O Chumak

    The quasiclassical distribution function for photon density in the phase space is obtained from solution of the kinetic equation. This equation describes propagation of paraxial laser beams in the Earth atmosphere where ‘collision integral’ embodies the influence of turbulence. The anisotropy of photon distribution is shown and explained. For long propagation path, the explicit expression for fourth-order

    更新日期:2020-09-23
  • Highly purified transversely polarized optical needle generated by the hybridly polarized vector optical field with hyperbolic symmetry
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Xu-Zhen Gao, Peng-Cheng Zhao, Xue-Feng Sun, Fan Yang, Yue Pan, Yongnan Li, Chenghou Tu and Hui-Tian Wang

    We design and generate a kind of hybridly polarized vector optical field (VOF) with hyperbolic symmetry for the first time. After tightly focusing the new VOF, an optical needle is achieved with sub-wavelength transverse size (∼ 0.3 λ 2 ), and the depth of focus (DOF) is about twice as large as the common optical fields such as linearly, circularly, radially and azimuthally polarized optical fields

    更新日期:2020-09-23
  • Lensless computer-generated hologram with wavelength-order resolution consisting of photon sieves
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Jun-ichiro Sugisaka and Ko Onishi

    We propose a photon-sieve hologram (PSH), a novel computer-generated hologram for generating an image with a resolution of the order of the wavelength. The PSH is designed by synthesising many photon sieves. The PSH has a simple structure that consists of pinholes with the same sizes and depths, and it directly generates images without other optical elements such as masks and imaging optical system

    更新日期:2020-09-23
  • Non-stationary pulses with complex-valued temporal degree of coherence
    J. Opt. (IF 2.379) Pub Date : 2020-09-22
    Yongtao Zhang, Chaoliang Ding, Milo W Hyde IV and Olga Korotkova

    It is shown that fine phase structuring of the temporal degree of coherence of a non-stationary pulse source leads to breaking its average arrival time symmetry on propagation in a linear dispersive medium. We employ the temporal counterpart of a recently proposed sliding function technique ((2018) Opt. Lett. 43 4727) for obtaining several models for the bona fide complex temporal degree of coherence

    更新日期:2020-09-23
  • Addendum: Radiation force and torque of light-sheets (2017 J. Opt. 19 065403 [https://doi.org/10.1088/2040-8986/aa6c73] )
    J. Opt. (IF 2.379) Pub Date : 2020-09-15
    F G Mitri

    The purpose of this Addendum is to provide some clarifications and additional discussions related to the formalism of the generalized Lorenz–Mie theories in two-dimensions presented in the manuscript (Mitri F G 2017 J. Opt. 19 065403). The generalized formalism provides exact mathematical expressions that are used to compute the optical scattering, and time-averaged radiation force and torque of any

    更新日期:2020-09-16
  • Numerical study on the tight focusing of radially polarized beams with polarization-insensitive metalenses
    J. Opt. (IF 2.379) Pub Date : 2020-09-15
    Zhe Shen, Rui Li, Qinnan Chen and Baifu Zhang

    Radially polarized beam (RPB) could be focused to a tighter spot than a spatially homogeneous polarized beam with a high numerical aperture (NA) objective lens. However, the traditional objective lens suffers from high cost and bulky size. In this paper, polarization-insensitive nanopillar metalenses were designed to execute tight focusing without the requirement of the incident beams to be specific

    更新日期:2020-09-16
  • Spatio-temporal characterization of ultrashort laser beams: a tutorial
    J. Opt. (IF 2.379) Pub Date : 2020-09-15
    Spencer W Jolly, Olivier Gobert and Fabien Quéré

    The temporal characterization of ultrafast laser pulses has become a cornerstone capability of ultrafast optics laboratories and is routine both for optimizing laser pulse duration and designing custom fields. Beyond pure temporal characterization, spatio-temporal characterization provides a more complete measurement of the spatially-varying temporal properties of a laser pulse. These so-called spatio-temporal

    更新日期:2020-09-16
  • Cnoidal wave solutions for the optical Benney-Luke equation
    J. Opt. (IF 2.379) Pub Date : 2020-09-15
    Artorix de la Cruz and Michael Cada

    At proper scale of the asymptotic analysis, the optical Benney-Luke equation (OBLE) explains the propagation of a continuous wave (cw) laser beam in a nonlocal non-linear defocusing media. By means of an OBLE and appropriate boundary conditions, we have obtained non-linear periodic wave solutions. The corresponding analytical expressions and numerical plots of the cnoidal waves in the phase plane are

    更新日期:2020-09-16
  • Optical vortex generated with an asymmetric forked grating
    J. Opt. (IF 2.379) Pub Date : 2020-09-09
    M Soskin, M Vasnetsov, V Pas’ko and D Plutenko

    Over 30 years ago a simple laboratory tool for optical-vortex beams generation was reported as a synthesized ‘forked’ diffraction grating. We renew the issue, addressing specific properties of such a grating in the sense of geometrical transformation of the grating shape. Stretching or compressing the grating scale results in the astigmatic optical vortex appearance in the first diffraction order.

    更新日期:2020-09-10
  • Investigation of the optical beam shifts for monolayer MoS 2 using polarimetric technique
    J. Opt. (IF 2.379) Pub Date : 2020-09-09
    Akash Das and Manik Pradhan

    The spatial and angular Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts are examined for fundamental Gaussian beam (633 nm) reflected from a monolayer of MoS 2 using the ‘Stokes polarimetric’ technique. This technique enables us to promptly determine the magnitudes of the reflection coefficients and their relative phase differences which gives the optical beam shifts. The GH and IF shifts are measured

    更新日期:2020-09-10
  • 3D cross-bended metasurfaces with polarization insensitivity and high-Q resonances
    J. Opt. (IF 2.379) Pub Date : 2020-09-09
    Ruhao Pan, Shuo Du, Zhe Liu, Wei Zhu, Ce Li, Changzhi Gu and Junjie Li

    Metasurfaces with high-quality (HQ) resonances are always desired for their potential applications in biomedicine and photonic devices. However, the realization of HQ near-infrared metasurfaces with polarization insensitivity has faced problems with metallic loss, large feature size and limited configurations. In order to build up HQ metasurfaces working at the near-infrared range, we propose a 3D

    更新日期:2020-09-10
  • Evolution and reversal of topological edge states at optical frequencies from a two-dimensional photonic crystal
    J. Opt. (IF 2.379) Pub Date : 2020-09-09
    Yiheng Wu, Xiaoxue Li and Yuntuan Fang

    The nonreciprocal, defect-immune and backscatter suppression of topological waveguides will play an important role in future optical communication systems. For a long time, researchers have studied such waveguides through magneto-optical media. On one hand, for gyromagnetic media, they have a large magneto-optical effect, but also have large losses at high frequencies; on the other hand, for gyroelectric

    更新日期:2020-09-10
  • Effect of coating few-layer WS 2 on the Raman spectra and whispering gallery modes of a microbottle resonator
    J. Opt. (IF 2.379) Pub Date : 2020-09-09
    Shubhayan Bhattacharya, Aneesh V Veluthandath, C C Huang, Ganapathy Senthil Murugan and Prem B Bisht

    Multi-layered tungsten disulfide (WS 2 ) coated silicon/silica (Si/SiO 2 ) substrate and SiO 2 micro-bottle resonators (MBRs) have been prepared by van der Waals epitaxy method. Raman spectra of WS 2 -coated MBR show that the out-of-plane Raman mode is sensitive to the polarization of the excitation laser. The quality factor ( Q ) values of the whispering gallery modes (WGMs) in the transmission spectrum

    更新日期:2020-09-10
  • Topologically protected Mach–Zehnder interferometer
    J. Opt. (IF 2.379) Pub Date : 2020-09-03
    Peilin Yang, Pengpeng Jiang, Xiaowei Guo and Lianping Hou

    As photonic integration continues to evolve, compact and low loss Mach–Zehnder interferometers (MZI) have been an area of significant research in recent years. Here, we propose a valley-Hall effect based topologically protected Mach–Zehnder interferometer (TPMZI). Our simulations show that the TPMZI is efficient and stable even in complex situations. Sharp waveguide bending and defects such as obstructions

    更新日期:2020-09-05
  • Trapping nanospheres within graphene-based heterogeneous plasmonic nano-trench
    J. Opt. (IF 2.379) Pub Date : 2020-09-03
    Noor Uddin, Qing Yang, Guangqing Du, Feng Chen, Dayantha Lankanath, Huijing Li and Xun Hou

    We theoretically investigate a graphene-based heterogeneous plasmonic nano-trench for trapping noble metal and non-metal nanospheres. We propose heterogeneous plasmonic modeling geometry consisting of silver, gold and graphene for functioning plasmonic trapping operating at the near-infrared spectrum. For our designed model, the vertical potential well is 32 times larger than the Brownian motion energy

    更新日期:2020-09-05
  • Multiple-image hybrid encryption based on compressive sensing and diffractive imaging
    J. Opt. (IF 2.379) Pub Date : 2020-09-02
    Abdurrahman Hazer and Remzi Yıldırım

    In this paper, the Hybrid-II method for encrypting multiple images by combining simple modified diffractive imaging-based encoding (SMDIBE) and compressive sensing (CS) algorithm is developed. Separately encrypted images are combined in a single plane with the space multiplexing technique and authorization is provided for different users. The matrix size of the ciphertext is also reduced by a method

    更新日期:2020-09-03
  • Ultra-wide unidirectional infrared absorber based on 1D gyromagnetic photonic crystals concatenated with general Fibonacci quasi-periodic structure in transverse magnetization
    J. Opt. (IF 2.379) Pub Date : 2020-09-02
    Sijia Guo, Caixing Hu and Haifeng Zhang

    In this paper, an ultra-wide multiband unidirectional absorber based on 1D gyromagnetic magnetized photonic crystals (GMPCs) comprising ferrite material and isotropic dielectrics is investigated under transverse magnetization for transverse electric mode within the infrared regime by the transfer matrix method. Due to the Voigt magneto-optical effect, the magnetically modulated absorber possesses multiple

    更新日期:2020-09-03
  • Step-wise homogeneous passive coatings for reduction of electromagnetic scattering from cylindrical metallic bodies
    J. Opt. (IF 2.379) Pub Date : 2020-09-02
    Thtreswar Beeharry, Ana Díaz-Rubio, Viktar Asadchy, Habiba H Ouslimani and and Sergei Tretyakov

    The total scattering cross section (or width) of strongly scattering metallic objects can be reduced by using various cloaks, which are complex structures with a limited frequency bandwidth. In many applications, however, dramatic reduction of total scattering is not always required, for instance, when backscattering reduction is the critical parameter. Moreover, the direction of illumination is sometimes

    更新日期:2020-09-03
  • Compressed off-axis digital holography
    J. Opt. (IF 2.379) Pub Date : 2020-08-26
    Shuhei Yoshida

    The Fourier transform method (FTM), which can reconstruct a wavefront from a single hologram, is widely used in digital holography (DH) as a reconstruction technique. However, the space-bandwidth product (SBP) is limited because of the frequency filtering required. We propose a wavefront reconstruction algorithm based on compressed sensing that can obtain a high SBP for use instead of the FTM. The

    更新日期:2020-08-27
  • A theoretical proposal for the tunable electromagnetically induced transparency with superior properties based on the solid-state plasma
    J. Opt. (IF 2.379) Pub Date : 2020-08-24
    Fenying Li, Tao Zhang, Mingyu Mao and Haifeng Zhang

    Based on the solid-state plasma (SSP), a metamaterial analog of electromagnetically induced transparency (EIT-like) with superior properties is theoretically proposed, including tunability, a large group index, and delay-bandwidth product (DBP), polarization independence, and low-loss. By exciting different specific parts of the SSP, the EIT-like peak frequency switches from 8.518 GHz with 90.92% transmissivity

    更新日期:2020-08-25
  • Plasmonic crystal with independently tunable double resonances
    J. Opt. (IF 2.379) Pub Date : 2020-08-24
    Xinan Xu, Jinwu Dong, Shuai Chen and Xianyu Ao

    This paper reports the design and fabrication of large-area periodic arrays of metal nanostructures that can support dual-wavelength resonance with spatially overlapping hot spots. Gold films with protruding posts arranged in a rectangular lattice are stripped from silicon templates containing shallow hole arrays, defined by laser interference lithography. The plasmonic resonances at the band edges

    更新日期:2020-08-25
  • Photo-tunable terahertz absorber based on intercalated few-layer graphene
    J. Opt. (IF 2.379) Pub Date : 2020-08-24
    M Masyukov, A N Grebenchukov, E A Litvinov, A Baldycheva, A V Vozianova and M K Khodzitsky

    In this paper, we show the ability of usage intercalated few-layer graphene for the development of an optically tunable absorbing metasurface. The geometrical parameters of the metasurface are optimized using the equivalent circuit model theory. Depending on the geometrical parameters, the metasurface shows frequency or absorption level tunability: the first design allows us to achieve the modulation

    更新日期:2020-08-25
  • Adiabatic invariants for surface plasmons on temporally dynamic graphene
    J. Opt. (IF 2.379) Pub Date : 2020-08-20
    M I Bakunov, A V Shirokova and A V Maslov

    For surface plasmons on graphene in an arbitrary dielectric environment, combinations of the plasmon energy and frequency (adiabatic invariants) that are conserved during slow time-variations of the graphene free carrier density are obtained. The invariants allow one to find the plasmon energy changes directly from the frequency shift without solving a dynamic equation. The invariants have a different

    更新日期:2020-08-22
  • Silicon waveguides with graphene: coupling of waveguide mode to surface plasmons
    J. Opt. (IF 2.379) Pub Date : 2020-08-20
    Jiří Čtyroký, Jiří Petráček, Vladimír Kuzmiak, Pavel Kwiecien and Ivan Richter

    Silicon waveguides with graphene layers have been recently intensively studied for their potential as fast and low-power electro-optic modulators with small footprints. In this paper we show that in the optical wavelength range of 1.55 μ m, surface plasmons supported by the graphene layer with the chemical potential exceeding ∼0.5 eV can couple with the guided mode of the silicon waveguide and affect

    更新日期:2020-08-22
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