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Optical Devices - Science topic

Products or parts of products used to detect, manipulate, or analyze light, such as LENSES, refractors, mirrors, filters, prisms, and OPTICAL FIBERS.
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Publications related to Optical Devices (10,000)
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Cardiac action potential (AP) shape and propagation are regulated by several key dynamic factors such as ion channel recovery and intracellular Ca²⁺ cycling. Experimental methods for manipulating AP electrical dynamics commonly use ion channel inhibitors that lack spatial and temporal specificity. In this work, we propose an approach based on optog...
Article
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Optical devices capable of suppressing diffraction nature of light are of great technological importance to many nanophotonic applications. One important technique to achieve diffractionless optics is to exploit field canalization effect. However, current technological platforms based on metamaterial structures typically suffer from strict loss-con...
Article
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Optical boundaries are basic structures for optical system and they become visible where reflection and refraction occur. The visible boundary is very often presented as a nuisance to optical systems in imaging recording or in display. Harnessing the optical boundaries up to a complete carpeting is scientifically interesting and technologically imp...
Article
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Microlens array (MLA) is a key part of optical element for biomedical inspection, lab-on-a-chip device, and light-field cameras. However, conventional MLAs always have only one focal plane, which makes them difficult to capture targets at different positions. To solve this problem, a planar multi-focus MLA (MF-MLA) was prepared on a polydimethylsil...
Preprint
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In this paper, a differential MOEMS accelerometer based on the Fabry-Perot (FP) micro-cavities is presented. The optical system of the device consists of two FP cavities and the mechanical system is composed of a proof mass that is suspended by four springs. The applied acceleration tends to move the PM from its resting position. This mechanical di...
Article
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Background The main objective is related to the capability of integrating into minimally invasive and ultra-thin disposable micro-endoscopic tool, a modality of realizing high-resolution imaging through scattering medium such as blood while performing medical procedure. In this research we aim for the first time to present a time-multiplexing super...
Preprint
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We provide a complete analysis, from theory to experiment, of the spontaneous emergence of a discretized conical wave of X-type (i.e., a localized 2D+1 space-time wavepacket) when an intense ultrashort pulse nonlinearly propagates in a multimode fiber. In particular, we reveal that this spatiotemporal phenomenon corresponds to broadband intermodal...
Conference Paper
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In this paper, we investigate the feasibility of using subspace system identification techniques for estimating transient Structural-Thermal-Optical Performance (STOP) models of reflective optics. As a test case, we use a Newtonian telescope structure. This work is motivated by the need for the development of model-based data-driven techniques for...
Article
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Achieving aberration correction can improve the imaging quality of an optical system, and reducing the error sensitivity of system can improve the realizability of the system. In order to obtain an off-axis three-mirror optical system with high image quality and low error sensitivity, a design method is proposed which obtains the initial structure...
Article
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Optical imaging through complex media, such as biological tissues or fog, is challenging due to light scattering. In the multiple scattering regime, wavefront shaping provides an effective method to retrieve information; it relies on measuring how the propagation of different optical wavefronts are impacted by scattering. Based on this principle, s...
Article
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Bi³⁺ and Ce³⁺ substituted rare-earth iron garnet is famous magneto-optical material for the application in integrated optical system and microwave devices. Nevertheless, the modulation of Bi³⁺ and Ce³⁺ on the structure and magnetic behavior of terbium iron garnet (TIG) is not very clear, which limits its practical applications. Herein, a series of...
Article
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The twin image problem, well known in Gabor holography, greatly obstructs the output of high-quality holograms. Previous solutions include numerical and instrumental means to eliminate or mitigate the issue. The proposed method demonstrates the feasibility of using the sagitta angle in a spherical reference beam as an intrinsic reference angle with...
Article
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For acoustic roughness monitoring of the railway network at train travelling speed, new direct measurement methods are required. Common direct measurement methods need the blocking of track sections, as they are based on manually operated devices. Indirect measurement methods such as accelerometer or microphone measurements can be installed on the...
Article
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In this paper, we introduce a planar optical Schell-model source correlation function for a Bessel-modulated Gaussian Schell-model beam (QBGSMB) with quadratic radial dependence. Based on the generalized Huygens-Fresnel diffraction integral and the Rytov theory, the spectral density of QBGSMB propagating through a paraxial ABCD optical system in at...
Article
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Detection and classification of nanoparticles in flow at a single particle resolution are becoming extremely important with the progress in materials chemistry, life science, and nanotechnology. Interferometric light scattering has been widely used as a highly sensitive nanoparticle detection technique. However, its application to flow cytometric a...
Article
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We apply the generalized Huygens-Fresnel diffraction integral to investigate propagation of Circular Lorentz-Gaussian beams (referred as CLGBs) through an ABCD optical system and a Spiral Phase Plate (SPP). The conversion of these beams by the considered optical elements permit us the generation of the Superposition of Humbert-Gaussian beams (SHGBs...
Preprint
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In a $\Lambda$CDM universe, most galaxies evolve by mergers and accretions, leaving faint and/or diffuse structures, such as tidal streams and stellar halos. Although these structures are a good indicator of galaxies' recent mass assembly history, they have the disadvantage of being difficult to observe due to their low surface brightness (LSB). To...
Experiment Findings
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In this report we present the results from the diagnostics of plasma density to characterize plasma sources aimed towards usage in Plasma Wake Field Acceleration at Laboratori Nazionali di Frascati (INFN). The strategy we followed to measure the density values relies on the phenomenon of Stark broadening effect. Using Time-Resolved Spectroscopy, we...
Conference Paper
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Measurements performed by disdrometers are often used in order to study and characterize the impact that precipitation induces into electromagnetic waves. This paper presents the 1D-Video-Disdrometer (1DVD). Thanks to the generous measuring area offered by this device, the sampling effect often associated with the disdrometers available on the mark...
Article
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Inspired by plant grafting; grafted vortex beams can be formed through grafting two or more helical phase profiles of optical vortex beams. Recently; grafted perfect vortex beams (GPVBs) have attracted much attention due to their unique optical properties and potential applications. However; the current method to generate and manipulate GPVBs requi...
Preprint
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The quality of quantitative differential phase contrast reconstruction (qDPC) can be severely degenerated by the mismatch of the background of two oblique illuminated images, yielding problematic phase recovery results. These background mismatches may result from illumination patterns, inhomogeneous media distribution, or other defocusing layers. I...
Article
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Numerical simulations are carried out to evaluate the coherence concept's effect on the performance regarding the optical system, when observing and imaging the planet's surface. In numerous optical approaches, the coherence qualities of light sources play an important role. This paper provides an overview about the mathematical formulation of temp...
Article
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Optical multisensor systems are easy-to-use and inexpensive analytical devices. In this work, we propose an optical multisensor system based on the luminescence of Nd(III) and Yb(III) complexes in the near-infrared (NIR) spectral region. The observed emission bands play the role of secondary light sources for further analysis of milk—for the determ...
Preprint
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We experimentally demonstrate the enhanced atmospheric turbulence resiliency in a 137.8 Gbit/s/mode mode-division multiplexing free-space optical communication link through the application of a successive interference cancellation digital signal processing algorithm. The turbulence resiliency is further enhanced through redundant receive channels i...
Article
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In the ABCD optical system, the propagation properties and the radiation forces are obtained by studying the cross spectral density of partially coherent self-shifting cosine-Gaussian beams. A self-shifting phenomenon occurs when the beams propagate in the strongly nonlocal nonlinear medium. The shifting parameters could influence the bend characte...
Article
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The special dispersion and temperature characteristics of diffractive optical element (DOE) make them widely used in optical systems that require both athermalization and achromatic aberrations designs. The multi-layer DOE (MLDOE) can improve the diffraction efficiency of the overall broad waveband, but its diffraction efficiency decreases with cha...
Article
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In this paper, a 220 GHz broadband and high-power staggered double-vane traveling-wave tube has been designed and verified. Firstly, a planar double-beam staggered double-vane slow-wave structure is proposed. By using the double-mode operation scheme, the transmission performance and bandwidth have been almost increased with twice as the single mod...
Article
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The prevalence of myopia is growing at an alarming rate and is associated with axial elongation of the eye. The cause of this undesirable physiological change involves multiple factors. When the magnitude of myopia approaches high levels, this accompanying mechanical effect increases the risk of developing other clinical conditions associated with...
Article
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The concept of infinitesimal elastic deformation and the theory of elastic seismic waves was formed in the first part of the 19th century and was based mainly on the Fermat, Huygens and Snell developments in the theory of optics. At the same time, seismic wave propagation (utilized in geophysical prospecting) and optic wave propagation through defi...
Article
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Additive manufacturing is now regularly used for customised fabrication of parts with complex shapes and geometries. However, the large range of relevant scales, high slopes, step-like transitions, undercuts, alternation between dark and overly bright regions and other complex features present on the surfaces, in particular of metal additive parts,...
Article
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Subreflector misalignment of a large steerable radio telescope induces a pointing error and reduces the gain of the antenna system. To improve the antenna’s operational efficiency, it is necessary to measure and adjust the position and attitude of the subreflector in real time. In this paper, a method based on a position sensitive detector (PSD) an...
Article
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An optimization model for the optical imaging system was established in this paper. It combined the modern design of experiments (DOE) method known as Latin hypercube sampling (LHS), Kriging surrogate model training, and the multi-objective optimization algorithm NSGA-III into the optimization of a triplet optical system. Compared with the methods...
Article
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Abstract Proper use of low vision devices by students with low vision during their daily academic activities is very crucial to enhance residual vision and thereby promote the independence of the students. This study investigated how students with low vision used optical low vision devices during their day-to-day activities. The study was a qual...
Article
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There are differences of spectral characteristics between different types of meat cut, which means the model established using only one type of meat cut for meat quality prediction is not suitable for other meat cut types. A novel portable visible and near-infrared (Vis/NIR) optical system was used to simultaneously predict multiple quality indicat...
Article
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A major challenge in practical quantum computation is the ineludible errors caused by the interaction of quantum systems with their environment. Fault-tolerant schemes, in which logical qubits are encoded by several physical qubits, enable to the output of a higher probability of correct logical qubits under the presence of errors. However, strict...
Article
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In the last few decades, a Significant advance in the laser detection techniques have occurred in a civilian application like optical fiber communication system, lidar system and now satellite communication in the erospace and a military application, one of the most applications in military is the laser guided missiles and bombs encountered high de...
Article
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The generation and propagation of vortex beams in real free space can be distorted by factors such as atmospheric turbulence and imperfections in the optics, resulting in wavefront distortions and negative effects on the interferogram. To correct the wavefront aberration introduced by the errors, an aberration correction method for the interference...
Article
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In this paper, the proficiency of nonlinearity compensation studied on the polarization division multiplexing 0.3 return-to-zero quadrature phase-shift keying (PDM-0.3RZ-QAM) coherent optical system. The considerable nonlinear effect is the self-phase modulation (SPM) in the presence of chromatic dispersion. The nonlinearity mitigation technique ba...
Article
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In this paper, circular Lorentz–Bessel–Gaussian beams (CLBGBs) are introduced as a novel member of the Lorentz-Gaussian beams family. The analytical expression of the propagation of these beams passing through a paraxial optical ABCD system is derived. The generalized Huygens-Fresnel diffraction integral of the form Collins’s formula and the expans...
Article
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Material loss, especially in metal and 2D materials, is the bottleneck for high‐performance integrated optical devices. Here, a novel concept by utilizing the high‐loss materials in a non‐Hermitian system instead of avoiding the loss materials. It is theoretically analyzed how the complex refractive index affects the loss of optical devices based o...
Article
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With the development of science and technology, in the fields of national defense, aerospace, medical treatment, automobile, and so on, the demands for ultra-precision parts and molds with complex surfaces such as aspheric or free-form surface are becoming more and more common and demanding. Bonnet polishing technology, which uses a new polishing t...
Article
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In this work, an analytical treatment for the wavefront propagation in optical systems is proposed. This treatment has taken into account the effects of lateral and radial shear interferograms between wavefronts as well as the order of the wavefront that depends on the incidence angle. Results showed that the wavefront ordinary and magnified deviat...
Preprint
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In the Phase 2 of the AWAKE first experimental run (from May to November 2018), an electron beam was used to probe and test proton-driven wakefield acceleration in a rubidium plasma column. In this work, we analyze the overall charge capture and shot-to-shot reproducibility of the proton-driven plasma wakefield accelerator with various electron bun...
Preprint
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The challenge posted by modern science is to find a way to compute the NP-hard problem. Here we present a coherent computation model based on the whispering-gallery mode micro-resonators. We introduce the optically connected micro-resonators array to simulate the dynamical evolution of the Ising model with full connection while the mode chirality o...
Article
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The optical system that combines imaging and image motion compensation is conducive to the miniaturization of aerial mapping cameras, but the movement of optical element for image motion compensation will cause a decrease in image quality. To solve this problem, reducing the sensitivity of moving optical element is one of the effective ways to ensu...
Article
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Silicon photonics has recently expanded its applications to delivering free-space emissions for detecting or manipulating external objects. The most notable example is the silicon optical phased array, which can steer a free-space beam to achieve a chip-scale solid-state LiDAR. Other examples include free-space optical communication, quantum photon...
Article
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The study and prediction of the structure and hardness in the overlapping area during multi-pass laser heat treatment (LHT) is an important issue for the preparation of the technological process and directly affects the choice of the LHT parameters. The scanner-based laser transformation hardening of the AISI 1045 medium carbon steel and AISI D2 hi...
Article
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In this study, the basics of optical system design are presented. It contains a series of formulations ordered by subject areas or topics representing typical lens design tasks and optical system design tasks. Different aspects are covered, such as the definition of starting systems and the creation, evaluation, and optimization of lenses and syste...
Article
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Optical systems often consist largely of empty space, as diffraction effects that occur through free-space propagation can be crucial to their function. Contracting these voids offers a path to the miniaturisation of a wide range of optical devices. Recently, a new optical element-coined a 'spaceplate'-has been proposed, that is capable of emulatin...
Article
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Aiming at the application of close-up space measurement based on time-of-flight (TOF) cameras, according to the analysis of the characteristics of the space background environment and the imaging characteristics of the TOF camera, a physics-based amplitude modulated continuous wave (AMCW) TOF camera imaging simulation method for space targets based...
Article
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Accurate wavefront measurement using double-grating Ronchi lateral shearing interferometry significantly relies on the accuracy of shear-phase retrieval. Traditional methods cannot effectively suppress the interferences of unwanted diffractions generated by the Ronchi grating at the image plane. In this paper, we propose a method that uses 3N+1 she...
Article
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Microscopy by Achromatic X-rays With Emission of Laminar Light (MAXWELL) is a new X-ray/visible technique with attractive characteristics including isotropic resolution in all directions, large-volume imaging and high throughput. An ultrathin, laminar X-ray beam produced by a Wolter type I mirror irradiates the sample stimulating the emission of vi...
Article
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Sulfide ores are a major source of noble (Au, Ag, and Pt) and base (Cu, Pb, Zn, Sn, Co, Ni, etc.) metals and will, therefore, be vital for the self-sustainment of future Mars colonies. Martian meteorites are rich in sulfides, which is reflected in recent findings for surface Martian rocks analyzed by the Spirit and Curiosity rovers. However, the on...