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  • Speckle denoising techniques in imaging systems
    J. Opt. (IF 2.753) Pub Date : 2020-05-25
    Manoj Kumar, Yassine Tounsi, Karmjit Kaur, Abdelkrim Nassim, Fernando Mandoza-Santoyo and Osamu Matoba

    In digital coherent imaging and measurement systems, the image/fringe pattern quality is severely degraded by multiplicative uncorrelated noise, called speckle, resulting due to the coherent nature of the light source, which restricts the development of several applications of these systems in various fields. Digital holography, holographic interferometry, speckle metrology, and shearography are the

  • Optical states in a 1D superlattice with multiple photonic crystal interfaces
    J. Opt. (IF 2.753) Pub Date : 2020-05-21
    Nicholas J Bianchi and Leonard M Kahn

    Interface states in a 1D photonic crystal heterostructure with multiple interfaces are examined. The heterostructure is a periodic network consisting of two different photonic crystals. In addition, the two crystals themselves are periodic, with one being made of alternating binary layers and the other being a quaternary crystal with a tunable layer. The second crystal can thus be smoothly transformed

  • Analytical analysis of ##IMG## [http://ej.iop.org/images/2040-8986/22/6/065605/toc_joptab8b24ieqn1.gif] and quasi- ##IMG## [http://ej.iop.org/images/2040-8986/22/6/065605/toc_joptab8b24ieqn2.gif] symmetry in thick diffraction gratings using coupled...
    J. Opt. (IF 2.753) Pub Date : 2020-05-20
    Mohammad Sedghi, Asghar Gholami and L Jay Guo

    The concept of parity-time ( ##IMG## [http://ej.iop.org/images/2040-8986/22/6/065605/joptab8b24ieqn3.gif] {$\mathcal{P}\mathcal{T}$} ) symmetry in optics could potentially provide emerging solutions to exploit the benefits of optical gain in optical processing. With this regard, ##IMG## [http://ej.iop.org/images/2040-8986/22/6/065605/joptab8b24ieqn4.gif] {$\mathcal{P}\mathcal{T}$} and quasi- ##IMG##

  • Hybrid cryptosystem based on plaintext related computational ghost imaging encryption and elliptic curve algorithm
    J. Opt. (IF 2.753) Pub Date : 2020-05-19
    Yuanchun Tao, Xiulun Yang, Xiangfeng Meng, Yurong Wang, Yongkai Yin and Guoyan Dong

    A hybrid cryptosystem based on plaintext-related ghost imaging and elliptic curve public-key cryptographic algorithm (ECC) is proposed in this paper. Thereinto, the ECC algorithm is used to protect and distribute session keys and the optical encryption system with session keys is used to encrypt and decrypt images. Thousands of phase-only mask keys can be replaced by parameter keys in this method,

  • Enhanced third harmonic generation from sinusoidal graphene gratings
    J. Opt. (IF 2.753) Pub Date : 2020-05-19
    Yan Zhao, Huawei Liang, Yanyan Huo, Lina Zhao, Qingli Zhou, Baoyuan Man and Tingyin Ning

    We investigate the nonlinear optical third harmonic generation of sinusoidal curved graphene which is placed on the dielectric substrate. Under transverse magnetic polarization, the third harmonic generation (THG) from graphene is dramatically enhanced at fundamental-mode and several higher-order modes of surface plasmon of graphene. The enhancement factor of THG is up to10 6 compared to that from

  • Interplay between strong and weak measurement: comparison of three experimental approaches to weak value estimation
    J. Opt. (IF 2.753) Pub Date : 2020-05-19
    Jan Roik, Karel Lemr, Antonín Černoch and Karol Bartkiewicz

    Weak values are traditionally obtained using a weak interaction between the measured system and a pointer state. It has, however, been pointed out that weak coupling can be replaced by a carefully tailored strong interaction. This paper provides a direct comparison of two strong interaction-based approaches (strong interaction accompanied by either a suitably prepared pointer state or quantum erasure)

  • Color Fourier ptychographic microscopy based on symmetrical illumination and wavelength multiplexing
    J. Opt. (IF 2.753) Pub Date : 2020-05-19
    Muyang Zhang, Di Yang and Yanmei Liang

    Fourier ptychographic microscopy (FPM), by using a LED array as its light source and each LED being lit up sequentially, can recover a high resolution (HR) and large field of view image from a sequence of low resolution (LR) images. It is difficult to obtain a perfect high resolution color image by a monochrome camera because of non-overlapping focal planes of different color channels resulting from

  • A modified pump–probe method for sensitive measurement of optical nonlinearity
    J. Opt. (IF 2.753) Pub Date : 2020-05-19
    Wenfa Zhou, Junyi Yang, Xingzhi Wu, Yu Fang, Lei Shen and Yinglin Song

    We have proposed an effective and convenient technique called coaxial pump–probe technique, which is implemented with two obscuration disks, to investigate the dynamics of nonlinear absorption in materials. Compared to the traditional pump–probe technique, the measurement sensitivity and capability of the system is enhanced by increasing the effective overlap region of pump and probe beams. Moreover

  • Resonant and non-resonant coupling of one-dimensional microcavity mode and optical Tamm state
    J. Opt. (IF 2.753) Pub Date : 2020-05-15
    Pratyusha Das, Subhrajit Mukherjee, Subhajit Jana, Samit Kumar Ray and B N Shivakiran Bhaktha

    Coupling between the optical Tamm states (OTS) and microcavity mode in one-dimensional photonic crystal (1DPhC) structures is investigated experimentally and numerically with the help of transfer matrix method in resonant and non-resonant conditions, as a function of the distance between the 1DPhC-metal interface and the cavity layer (in terms of number of bilayers, N top , between the Tamm cavity

  • Gold nano-urchins for plasmonic enhancement of random lasing in a dye-doped polymer
    J. Opt. (IF 2.753) Pub Date : 2020-05-15
    Venkata Siva Gummaluri, R Gayathri, C Vijayan and Vadakke Matham Murukeshan

    We report our results on a plasmonic random laser with three-dimensional (3D) gold nano-urchins as scatterers distributed in rhodamine 6G dye-doped polymer film. The performance of anisotropic urchin scatterers is first studied using electromagnetic simulations for absorption/scattering cross-section and local field enhancement. This is compared to gold nanospheres of similar size. The simulation results

  • Modification to the Fresnel formulas for amplified or attenuated internal reflection
    J. Opt. (IF 2.753) Pub Date : 2020-05-15
    Takeyuki Kobayashi

    The present study addresses the question of total internal reflection of a plane wave from an amplifying or attenuating medium. Inspection on the expressions for the modal gain or loss of an asymmetric planar waveguide having an amplifying or attenuating cladding has led us to the coefficients for amplified or attenuated internal reflection. The derived formulas suggest an interpretation that the refracted

  • Overcoming the phase-mismatch by fundamental beam modulation
    J. Opt. (IF 2.753) Pub Date : 2020-05-13
    Saeed Ghavami Sabouri

    Providing the phase-matching condition is crucial to achieve efficient frequency conversion in a nonlinear crystal. Birefringence and periodically poled nonlinear crystals are widely used to establish the phase-matching condition. Here, a method is proposed to overcome the phase mismatching between interacting waves in a nonlinear crystal by modulation of the fundamental beam intensity and phase. Accordingly

  • Ghost imaging in a Rician fading channel with additive random noise
    J. Opt. (IF 2.753) Pub Date : 2020-05-10
    Lingying Wu, Wei Tan, Xianwei Huang, Yanfeng Bai and Xiquan Fu

    The stability of the spatial information transmission in communication is very important, and the ghost imaging mechanism has shown advantages in resistance to the external interference factors and in the low-light detection. A Rician fading channel typically describes the environment with a direct path and an infinite number of multi-path scatters, and the channel quality could be directly reflected

  • Diffraction of bessel beams on 2D amplitude gratings—a new branch in the talbot effect study
    J. Opt. (IF 2.753) Pub Date : 2020-05-10
    I A Kotelnikov, O E Kameshkov and B A Knyazev

    In this paper, an analytical theory for the diffraction of a Bessel beam of arbitrary order J l ( κ r ) on a 2D amplitude grating is presented. The diffraction pattern behind the grating turned out to be more complicated in comparison with the classical Talbot effect observed under illumination by a plane wave. In particular, the patterns in the main and fractional Talbot planes under certain conditions

  • Asymmetric propagation of solitons in nonlinear media with gradual nonlocality
    J. Opt. (IF 2.753) Pub Date : 2020-05-04
    Yuanhang Weng, Peijun Chen, Geyu Tang and Hong Wang

    We investigate the propagation of solitons in homogeneous nonlocal nonlinear media and in media with gradual nonlinear nonlocality. We calculate the width and the maximum amplitude of solitons during propagation and demonstrate that solitons will propagate asymmetrically in the medium with gradual nonlinear nonlocality. Moreover, the propagation of solitons in the nonlinear medium with gradual nonlocality

  • Optimization of angular diffractive lenses with extended depth of focus
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    Luis Miguel Sanchez-Brea, Francisco Jose Torcal-Milla, Jesus del Hoyo, Alexander Cuadrado and Jose Antonio Gomez-Pedrero

    Conventional refractive lenses concentrate the incident light at focal distance. A narrow beam waist can be achieved by increasing the lens numerical aperture, but strongly reduces the depth of focus. In this work, we explore diffractive lenses designs, with fast angular variation of the focal distance, that produce both a narrow beam waist and a long depth of focus. We predict the focusing properties

  • Estimation of point spread function of an optical microscope using stochastic minimization of least square errors
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    Satya S Goutam Buddha and Bosanta R Boruah

    In this paper we propose a point spread function (PSF) estimation scheme for an optical microscope. The scheme is based on minimizing the least square error between the image of an arbitrary target and the convolution of a stochastically constructed PSF array with the geometrical-optics predicted image of the target. The proposed scheme is independent of the geometry of the imaging system and will

  • Revealing radiationless sources with multi-harmonic mantle cloaking
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    Giuseppe Labate, Andrea Massaccesi and Santi C Pavone

    A general formula for the scattering suppression of simultaneous cylindrical harmonic waves is reported for a bare dielectric cylinder. A proper surface impedance condition is imposed at the boundary between dielectric and background regions, revealing a parity-time condition for the internal electromagnetic field in order to be nonradiating. Depending on the maximum number ##IMG## [http://ej.iop.

  • Loss compensated extraordinary transmission in hybridized plasmonic nanocavities
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    Bilge Can Yildiz, Alireza R Rashed and Humeyra Caglayan

    Extraordinary optical transmission has been utilized in many optical applications, but the plasmonic losses hinder their full potential. To obtain enhanced transmission, one of the loss compensation methods is to introduce gain. However, an enhanced transmission or even eliminated absorption does not guarantee plasmonic loss compensation. Here, we reveal the distinction between the transmission enhancement

  • Quantum coherence of spatial photonic qudits: experimental measurement and path-marker analysis
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    P Machado and S Pádua

    Discussions about quantum interference, indistinguishability, and superposition between quantum states go back to the beginning of quantum mechanics. However, the theoretical problem, concerning quantitative measures for quantum coherence, was only recently solved by Baumgratz et al (2014 Phys. Rev. Lett. 113 140401). Since then, many works have explored one of the possible coherence measures: the

  • Optimization modulation method for 3D spectral data cube using linear encoding of intrinsic chromatic aberration
    J. Opt. (IF 2.753) Pub Date : 2020-05-03
    Yu Zhao, Yahong Li, Yu Liu, Yan Li and Yuegang Fu

    We develop herein a new optimization modulation method for the three-dimensional (3D) spectral data cube (SDC) based on the use of a linear encoding scheme of the intrinsic chromatic aberration, especially for snapshot multispectral or hyperspectral imaging systems. A mathematical model of the linear chromatic aberration modulation is established that provides theoretical guidelines on the optimal

  • Compressive ghost imaging in scattering media guided by region of interest
    J. Opt. (IF 2.753) Pub Date : 2020-04-30
    Ziqi Gao, Xuemin Cheng, Linfeng Zhang, Yao Hu and Qun Hao

    Compressive ghost imaging (CSGI) combines structured illumination and a bucket detector for obtaining the light intensity signal from an unknown object. Light fluctuations are generated by few measurements and then an image is reconstructed using optimization algorithms such as compressive sensing (CS) by finding its sparse representation. The measured light fluctuations are not sensitive to scattering

  • Direct en-face , speckle-reduced images using angular-compounded Master–Slave optical coherence tomography
    J. Opt. (IF 2.753) Pub Date : 2020-04-25
    René Říha, Manuel J Marques, Michael R Hughes, Adrian Bradu and Adrian Podoleanu

    In this paper, an angular compounding method to achieve speckle contrast reduction in optical coherence tomography (OCT) imaging is explored in detail. The angular compounding approach involves collecting multiple images at different angles of incidence, registering the images to correct for induced distortions, and then incoherently summing the images to reduce speckle. The method was experimentally

  • Polarization transfer from the twisted light to an atom
    J. Opt. (IF 2.753) Pub Date : 2020-04-25
    Andrei Afanasev, Carl E Carlson and Hao Wang

    When polarized light is absorbed by an atom, the excited atomic system carries information about the initial polarization of light. For the light that carries an orbital angular momentum, or the twisted light, the polarization states are described by eight independent parameters, as opposed to three Stokes parameters for plane waves. We use a parameterization of the spin-density matrix of the twisted

  • Lensfree super-resolved imaging based on adaptive Wiener filter and guided phase retrieval algorithm
    J. Opt. (IF 2.753) Pub Date : 2020-04-22
    Cheng Guo, Feilong Zhang, Xiaoqing Zhang, Xingchi Kan, Jiubin Tan, Shutian Liu and Zhengjun Liu

    We present a data-efficient framework to achieve a super-resolved reconstruction in lensfree on-chip microscopy. Instead of using conventional 3D-stack holograms, our method accomplishes a 5 × reduction of data size without the loss of the imaging resolution, in which merely 30 raw holograms are recorded. The experiment of the resolution target demonstrates a half-pitch lateral resolution of 780 nm

  • Substrate-modulated directional far field scattering behavior of individual plasmonic nanorods
    J. Opt. (IF 2.753) Pub Date : 2020-04-19
    Xupeng Zhu, Huimin Shi, Shi Zhang, Peng Dai, Zhiquan Chen, Shuwen Xue, Jun Quan, Jun Zhang and Huigao Duan

    Steering the energy of the incident light into the specific directions by using plasmonic nanostructures plays a key role for future micro-nano photonic integration and optical imaging systems, but the influence of the dielectric substrate on the full-space far-field scattering image of metal nanostructures remains unintuitive. In this paper, the influence of dielectric substrate on the far-field scattering

  • Vortex and cluster solitons in nonlocal nonlinear fractional Schrödinger equation
    J. Opt. (IF 2.753) Pub Date : 2020-04-15
    Qing Wang and Guo Liang

    We discover a series of ring and cluster solitons in the (1+2)-dimensional nonlocal nonlinear fractional Schrödinger equation by iteration algorithm, and verify their robustness by introducing random perturbations during propagations. We obtain the relations between the soliton power, the orbital angular momentum, and the rotation period of phase, which are dependent on the Lévy index α. When the radial

  • Bringing Schrödinger’s cat to life with non-equilibrium respiration
    J. Opt. (IF 2.753) Pub Date : 2020-04-15
    Arash Tirandaz, Hamid Reza Naeij and Afshin Shafiee

    In this study, we have proposed a method based on non-equilibrium effects to generate the superposition of macroscopically distinguishable quantum states, known as Schrödinger cat states, by using a Mach–Zehnder interferometry type experiment. The interaction of the input number state with a Kerr medium in the presence of a couple of heat baths in different temperatures in the interaction picture and

  • Radiation pressure and electrostriction induced enhancement for Kerr-like nonlinearities in a nanoscale silicon pedestal waveguide
    J. Opt. (IF 2.753) Pub Date : 2020-04-15
    Yaojing Zhang, Yifei Yao, Dan Yi and Hon Ki Tsang

    We report an enhancement of effective nonlinear-index coefficient from the combination of radiation pressure and electrostriction in an air-cladding silicon pedestal waveguide. The effective nonlinear-index coefficient was experimentally measured by characterizing spectral broadening with incident pulses in the pedestal waveguide. Larger spectral broadening was observed in the pedestal waveguide compared

  • Multiband reciprocal polarization insensitivity electromagnetically induced transparency in metasurfaces
    J. Opt. (IF 2.753) Pub Date : 2020-04-14
    Yuewu Ma, Dekai Li, Zhenhai Chen, Hongwen Qian and Renxia Ning

    A reciprocal electromagnetically induced transparency (EIT) effect is proposed in the complementary metasurface structure, which is composed of metal orthogonal strips beside a silicon substrate. The EIT effect of reciprocity is obtained whether the incident wave propagates from the positive (+z) or reverse (−z) direction. A multiband EIT window is also obtained in the structure of horizontal strip

  • Local and mean-field approaches for modeling semiconductor spin-lasers
    J. Opt. (IF 2.753) Pub Date : 2020-04-05
    Mariusz Drong, Tibor Fördös, Henri Y Jaffrès, Jan Peřina Jr, Kamil Postava, Jaromír Pištora and Henri-Jean Drouhin

    Electrically and optically pumped spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs) seem to attain improved performance compared to their conventional counterparts. Their dynamical properties are studied mostly in the framework of effective rate equations containing parameters that are difficult to directly relate with fundamental material properties. Consequently, such approaches

  • Optical encryption of hyperspectral images using improved binary tree structure and phase-truncated discrete multiple-parameter fractional Fourier transform
    J. Opt. (IF 2.753) Pub Date : 2020-04-05
    Honglin Li, Xiuying Bai, Mingguang Shan, Zhi Zhong, Lei Liu and Bin Liu

    We present an optical encryption scheme for hyperspectral images using an improved binary tree structure (IBTS) and phase-truncated discrete multiple-parameter fractional Fourier transform (PTdmpFrFT). In the IBTS, the encryption modules based on the phase-truncated fractional Fourier transform represented the branch nodes, while the hyperspectral bands of the plain images were considered as leaf nodes

  • Escape velocity sorting in optical tweezers system using a home-made piezo mirror
    J. Opt. (IF 2.753) Pub Date : 2020-04-05
    Milad Malekmohammadi, Ehsan A Akhlaghi, Jamal Soltani and Faegheh Hajizadeh

    The flow of a fluid around an optically trapped particle forces the particle to move out of its equilibrium position. The particle will escape the trap if the fluid velocity exceeds a certain limit. Accordingly, we propose a novel and accurate method to sort the particles due to a difference in their escape velocities that depends on the size and refractive index of the particles. Here, the influence

  • Effects of electric field coupling on the circular dichroism of composite nanostructures
    J. Opt. (IF 2.753) Pub Date : 2020-04-05
    Ying Li, Zhimin Jing, Yu Bai, Hamad Ullah and Zhongyue Zhang

    Chirality has substantial applications in the fields of medicine, biology, and physics. Previous studies of strong chiral responses mostly involved complex 3D plasmonic nanostructures. In this study, we demonstrate a planar plasmonic composite nanostructure to achieve large circular dichroism (CD) effect by tuning the coupling effect. By introducing a rectangular block to an L-shaped nanostructure

  • Reconstruction of complex-object using edge point referencing
    J. Opt. (IF 2.753) Pub Date : 2020-03-31
    Surya Kumar Gautam, Rakesh Kumar Singh, C S Narayanamurthy and Dinesh N Naik

    For imaging complex-valued objects, generally digital holography is used. In holography, the requirement of a separate reference source could restrict its application. Investigating objects through recording multiple holograms demands a stable platform to keep the reference field the same. Without the reference field, one can obtain only the object autocorrelation term from the far-field intensity

  • A high-accuracy phase shifting retrieval approach based on phase shifts search
    J. Opt. (IF 2.753) Pub Date : 2020-03-25
    Jiaosheng Li, Qinnan Zhang, Hanlin Wang, Liyun Zhong, Jindong Tian and Xiaoxu Lu

    To achieve high measurement accuracy without the restriction of fringe number, a high-accuracy phase shifting retrieval approach based on phase shifts search (PSS) is proposed. Firstly, by setting the search conditions related to the phase shifts and using the PSS method to obtain the phase shifts between the phase shifting interferograms, subsequently, the phase distribution of the sample can be accurately

  • Multispectral analysis tools can increase utility of RGB color images in histology.
    J. Opt. Pub Date : 2019-03-09
    Farzad Fereidouni,Croix Griffin,Austin Todd,Richard Levenson

    Multispectral imaging (MSI) is increasingly finding application in the study and characterization of biological specimens. However, the methods typically used come with challenges on both the acquisition and the analysis front. MSI can be slow and photon-inefficient, leading to long imaging times and possible phototoxicity and photobleaching. The resulting datasets can be large and complex, prompting

  • Interleaved segment correction achieves higher improvement factors in using genetic algorithm to optimize light focusing through scattering media.
    J. Opt. Pub Date : 2018-10-27
    Runze Li,Tong Peng,Yansheng Liang,Yanlong Yang,Baoli Yao,Xianghua Yu,Junwei Min,Ming Lei,Shaohui Yan,Chunmin Zhang,Tong Ye

    Focusing and imaging through scattering media has been proved possible with high resolution wavefront shaping. A completely scrambled scattering field can be corrected by applying a correction phase mask on a phase only spatial light modulator (SLM) and thereby the focusing quality can be improved. The correction phase is often found by global searching algorithms, among which Genetic Algorithm (GA)

  • Hyperspectral imaging solutions for brain tissue metabolic and hemodynamic monitoring: past, current and future developments.
    J. Opt. Pub Date : 2018-06-02
    Luca Giannoni,Frédéric Lange,Ilias Tachtsidis

    Hyperspectral imaging (HSI) technologies have been used extensively in medical research, targeting various biological phenomena and multiple tissue types. Their high spectral resolution over a wide range of wavelengths enables acquisition of spatial information corresponding to different light-interacting biological compounds. This review focuses on the application of HSI to monitor brain tissue metabolism

  • Roadmap on optical sensors.
    J. Opt. Pub Date : 2018-01-30
    Mário F S Ferreira,Enrique Castro-Camus,David J Ottaway,José Miguel López-Higuera,Xian Feng,Wei Jin,Yoonchan Jeong,Nathalie Picqué,Limin Tong,Björn M Reinhard,Paul M Pellegrino,Alexis Méndez,Max Diem,Frank Vollmer,Qimin Quan

    Sensors are devices or systems able to detect, measure and convert magnitudes from any domain to an electrical one. Using light as a probe for optical sensing is one of the most efficient approaches for this purpose. The history of optical sensing using some methods based on absorbance, emissive and florescence properties date back to the 16th century. The field of optical sensors evolved during the

  • Optical quantum memory based on electromagnetically induced transparency.
    J. Opt. Pub Date : 2017-08-23
    Lijun Ma,Oliver Slattery,Xiao Tang

    Electromagnetically induced transparency (EIT) is a promising approach to implement quantum memory in quantum communication and quantum computing applications. In this paper, following a brief overview of the main approaches to quantum memory, we provide details of the physical principle and theory of quantum memory based specifically on EIT. We discuss the key technologies for implementing quantum

  • Photobiomodulation and the brain: a new paradigm.
    J. Opt. Pub Date : 2017-06-06
    Madison Hennessy,Michael R Hamblin

    Transcranial photobiomodulation (PBM) also known as low level laser therapy (tLLLT) relies on the use of red/NIR light to stimulate, preserve and regenerate cells and tissues. The mechanism of action involves photon absorption in the mitochondria (cytochrome c oxidase), and ion channels in cells leading to activation of signaling pathways, up-regulation of transcription factors, and increased expression

  • Roadmap on neurophotonics.
    J. Opt. Pub Date : 2017-04-08
    Yong Ku Cho,Guoan Zheng,George J Augustine,Daniel Hochbaum,Adam Cohen,Thomas Knöpfel,Ferruccio Pisanello,Francesco S Pavone,Ivo M Vellekoop,Martin J Booth,Song Hu,Jiang Zhu,Zhongping Chen,Yoko Hoshi

    Mechanistic understanding of how the brain gives rise to complex behavioral and cognitive functions is one of science's grand challenges. The technical challenges that we face as we attempt to gain a systems-level understanding of the brain are manifold. The brain's structural complexity requires us to push the limit of imaging resolution and depth, while being able to cover large areas, resulting

  • Out-of-Focal Plane Imaging by Leakage Radiation Microscopy.
    J. Opt. Pub Date : 2017-01-01
    Liangfu Zhu,Douguo Zhang,Ruxue Wang,Xiaolei Wen,Pei Wang,Hai Ming,Ramachandram Badugu,Joseph R Lakowicz

    Leakage radiation microscopy (LRM) is used to investigate the optical properties of surfaces. The front-focal plane (FFP) image with LRM reveals structural features on the surfaces. Back-focal plane (BFP) image with LRM reveals the angular distribution of the radiation. Herein we experimentally demonstrate that the out-of-focal plane (OFP) images present a link between the FFP and BFP images and provide

  • In vivo volumetric depth-resolved vasculature imaging of human limbus and sclera with 1μm swept source phase-variance optical coherence angiography.
    J. Opt. Pub Date : 2015-05-20
    Raju Poddar,Robert J Zawadzki,Dennis E Cortés,Mark J Mannis,John S Werner

    We present nnnnnin vivo volumetric depth-resolved vasculature images of the anterior segment of the human eye acquired with phase-variance based motion contrast using a high-speed (100 kHz, 105 A-scans/s) swept source optical coherence tomography system (SSOCT). High phase stability SSOCT imaging was achieved by using a computationally efficient phase stabilization approach. The human corneo-scleral

  • Elastomeric Polymer Resonant Waveguide Grating based Pressure Sensor.
    J. Opt. Pub Date : 2014-11-25
    Fuchuan Song,Antonio Jou Xie,Sang-Woo Seo

    In this paper, we demonstrate an elastomeric polymer resonant waveguide grating structure to be used as a pressure sensor. The applied pressure is measured by optical resonance spectrum peak shift. The sensitivity - as high as 86.74pm/psi or 12.58pm/kPa - has been experimentally obtained from a fabricated sensor. Potentially, the sensitivity of the demonstrated sensor can be tuned to different pressure

  • Polymer waveguide grating sensor integrated with a thin-film photodetector.
    J. Opt. Pub Date : 2014-01-28
    Fuchuan Song,Jing Xiao,Antonio Jou Xie,Sang-Woo Seo

    This paper presents a planar waveguide grating sensor integrated with a photodetector (PD) for on-chip optical sensing systems which are suitable for diagnostics in the field and in-situ measurements. III-V semiconductor-based thin-film PD is integrated with a polymer based waveguide grating device on a silicon platform. The fabricated optical sensor successfully discriminates optical spectral characteristics

  • Polarized light imaging of birefringence and diattenuation at high resolution and high sensitivity.
    J. Opt. Pub Date : 2013-11-26
    Shalin B Mehta,Michael Shribak,Rudolf Oldenbourg

    Polarized light microscopy provides unique opportunities for analyzing the molecular order in man-made and natural materials, including biological structures inside living cells, tissues, and whole organisms. 20 years ago, the LC-PolScope was introduced as a modern version of the traditional polarizing microscope enhanced by liquid crystal devices for the control of polarization, and by electronic

  • Bleed-through correction for rendering and correlation analysis in multi-colour localization microscopy.
    J. Opt. Pub Date : 2013-09-01
    Dahan Kim,Nikki M Curthoys,Matthew T Parent,Samuel T Hess

    Multi-colour localization microscopy has enabled sub-diffraction studies of colocalization between multiple biological species and quantification of their correlation at length scales previously inaccessible with conventional fluorescence microscopy. However, bleed-through, or misidentification of probe species, creates false colocalization and artificially increases certain types of correlation between

  • Photoacoustic spectroscopy of β-hematin.
    J. Opt. Pub Date : 2012-07-31
    Edward B Samson,Benjamin S Goldschmidt,Paul J D Whiteside,Amanda S M Sudduth,John R Custer,Brenda Beerntsen,John A Viator

    Malaria affects over 200 million individuals annually, resulting in 800,000 fatalities. Current tests use blood smears and can only detect the disease when 0.1-1% of blood cells are infected. We are investigating the use of photoacoustic flowmetry to sense as few as one infected cell among 10 million or more normal blood cells, thus diagnosing infection before patients become symptomatic. Photoacoustic

  • Raman spectroscopy of individual monocytes reveals that single-beam optical trapping of mononuclear cells occurs by their nucleus.
    J. Opt. Pub Date : 2011-10-11
    Samantha Fore,James Chan,Douglas Taylor,Thomas Huser

    We show that laser-tweezers Raman spectroscopy of eukaryotic cells with a significantly larger diameter than the tight focus of a single beam laser trap leads to optical trapping of the cell by its optically densest part, i.e. typically the cell's nucleus. Raman spectra of individual optically trapped monocytes are compared with location-specific Raman spectra of monocytes adhered to a substrate. When

  • Full Range Complex Spectral Domain Optical Coherence Tomography for Volumetric Imaging at 47, 000 A Scans per Second.
    J. Opt. Pub Date : 2011-06-07
    Lin An,Molly Hrebesh,Ruikang K Wang

    In this paper, we demonstrate a high speed spectral domain optical coherence tomography (SDOCT) system capable of achieving full range complex imaging at 47 kHz line scan rate. By applying beam-offset method, a constant modulation frequency is introduced into each B-scan that enables reconstruction of the full range complex SDOCT images of in vivo tissue samples. To make use of the full capacity of

  • A modified fractal zone plate with extended depth of focus in spectral domain optical coherence tomography.
    J. Opt. Pub Date : 2011-05-01
    Q Q Zhang,J G Wang,M W Wang,J Bu,S W Zhu,R Wang,Bruce Z Gao,X-C Yuan

    In optical coherence tomography (OCT) systems, there is a trade-off between the depth of focus (DOF) and lateral resolution when conventional lenses are used. We propose a new method that employs a modified fractal generalized zone plate (MFraGZP) combined with a conventional lens to improve the trade-off effect, with an extended DOF of about 2.5 mm (14 times larger) while the lateral resolution is

  • Listening to tissues with new light: recent technological advances in photoacoustic imaging.
    J. Opt. Pub Date : 2019-09-09
    Tri Vu,Daniel Razansky,Junjie Yao

    Photoacoustic tomography (PAT), or optoacoustic tomography, has achieved remarkable progress in the past decade, benefiting from the joint developments in optics, acoustics, chemistry, computing and mathematics. Unlike pure optical or ultrasound imaging, PAT can provide unique optical absorption contrast as well as widely scalable spatial resolution, penetration depth and imaging speed. Moreover, PAT

  • Micromachined Silicon Parallel Acoustic Delay Lines as Time Delayed Ultrasound Detector Array for Real-Time Photoacoustic Tomography.
    J. Opt. Pub Date : 2016-01-06
    Y Cho,C-C Chang,L V Wang,J Zou

    This paper reports the development of a new 16-channel parallel acoustic delay line (PADL) array for real-time photoacoustic tomography (PAT). The PADLs were directly fabricated from single-crystalline silicon substrates using deep reactive ion etching. Compared with other acoustic delay lines (e.g., optical fibers), the micromachined silicon PADLs offer higher acoustic transmission efficiency, smaller

  • Approaching the quantum limit for plasmonics: linear atomic chains.
    J. Opt. Pub Date : 2016-01-01
    Garnett W Bryant

    Optical excitations in atomic-scale materials can be strongly mixed, with contributions from both single-particle transitions and collective response. This complicates the quantum description of these excitations, because there is no clear way to define their quantization. To develop a quantum theory for these optical excitations, they must first be characterized so that single-particle-like and collective

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