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Journal articles on the topic 'Optical wavefronts'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Malek, Stephanie C., Adam C. Overvig, Sajan Shrestha, and Nanfang Yu. "Active nonlocal metasurfaces." Nanophotonics 10, no. 1 (2020): 655–65. http://dx.doi.org/10.1515/nanoph-2020-0375.

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AbstractActively tunable and reconfigurable wavefront shaping by optical metasurfaces poses a significant technical challenge often requiring unconventional materials engineering and nanofabrication. Most wavefront-shaping metasurfaces can be considered “local” in that their operation depends on the responses of individual meta-units. In contrast, “nonlocal” metasurfaces function based on the modes supported by many adjacent meta-units, resulting in sharp spectral features but typically no spatial control of the outgoing wavefront. Recently, nonlocal metasurfaces based on quasi-bound states in the continuum have been shown to produce designer wavefronts only across the narrow bandwidth of the supported Fano resonance. Here, we leverage the enhanced light-matter interactions associated with sharp Fano resonances to explore the active modulation of optical spectra and wavefronts by refractive-index tuning and mechanical stretching. We experimentally demonstrate proof-of-principle thermo-optically tuned nonlocal metasurfaces made of silicon and numerically demonstrate nonlocal metasurfaces that thermo-optically switch between distinct wavefront shapes. This meta-optics platform for thermally reconfigurable wavefront shaping requires neither unusual materials and fabrication nor active control of individual meta-units.

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2

Khonina, Svetlana N., Sergey V. Karpeev, and Alexey P. Porfirev. "Wavefront Aberration Sensor Based on a Multichannel Diffractive Optical Element." Sensors 20, no. 14 (2020): 3850. http://dx.doi.org/10.3390/s20143850.

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We propose a new type of a wavefront aberration sensor, that is, a Zernike matched multichannel diffractive optical filter, which performs consistent filtering of phase distributions corresponding to Zernike polynomials. The sensitivity of the new sensor is theoretically estimated. Based on the theory, we develop recommendations for its application. Test wavefronts formed using a spatial light modulator are experimentally investigated. The applicability of the new sensor for the fine-tuning of a laser collimator is assessed.

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3

Trolinger, James D., Amit Lal, Joshua Jo, and Stephen Kupiec. "Programmable Holographic Optical Elements as Adaptive Optics in Optical Diagnostics Devices." Key Engineering Materials 437 (May 2010): 108–12. http://dx.doi.org/10.4028/www.scientific.net/kem.437.108.

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This paper reports a combined, Hartmann/Digital Holographic interferometry inspection system for inspecting optical components that do not easily lend themselves to conventional interferometric or Hartmann inspection. A programmable holographic optical element (HOE) preconditions wavefronts to extend the dynamic range of interferometry measurements and also transforms the same system into a scanning Hartmann operation, which has lower resolution but higher dynamic range. Inspecting aspherical surfaces with existing interferometers requires special, computer generated holographic optical elements to transform the wavefront to within the dynamic range of the interferometer. The Hartmann measurement provides the information required to precondition a reference wave that avails the measurement process to the more precise phase shifting interferometry. The SLM offers yet other benefits including a method for minimizing the effects of speckle on the measurement. The paper provides example measurements, discusses the limitations, and suggests other potential applications.

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4

Singh, Brijesh Kumar, G. Singh, P. Senthilkumaran, and D. S. Mehta. "Generation of Optical Vortex Arrays Using Single-Element Reversed-Wavefront Folding Interferometer." International Journal of Optics 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/689612.

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Optical vortex arrays have been generated using simple, novel, and stable reversed-wavefront folding interferometer. Two new interferometric configurations were used for generating a variety of optical vortex lattices. In the first interferometric configuration one cube beam splitter (CBS) was used in one arm of Mach-Zehnder interferometer for splitting and combining the collimated beam, and one mirror of another arm is replaced by second CBS. At the output of interferometer, three-beam interference gives rise to optical vortex arrays. In second interferometric configuration, a divergent wavefront was made incident on a single CBS which splits and combines wavefronts leading to the generation of vortex arrays due to four-beam interference. It was found that the orientation and structure of the optical vortices can be stably controlled by means of changing the rotation angle of CBS.

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5

Li, Shiqing, Zhuo Wang, Shaohua Dong, et al. "Helicity-delinked manipulations on surface waves and propagating waves by metasurfaces." Nanophotonics 9, no. 10 (2020): 3473–81. http://dx.doi.org/10.1515/nanoph-2020-0200.

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AbstractAlthough many approaches have been proposed to manipulate propagating waves (PWs) and surface waves (SWs), usually each operation needs a separate meta-device, being unfavorable for optical integrations. Here, we propose a scheme to design a single meta-device that can efficiently generate SWs and/or PWs with pre-designed wavefronts, under the excitations of circularly polarized (CP) PWs with different helicity. As a proof of concept, we design and fabricate a microwave meta-device and experimentally demonstrate that it can convert incident CP waves of opposite helicity to SWs possessing different wavefronts and traveling to opposite directions, both exhibiting very high efficiencies. We further generalize our scheme to design a meta-device and numerically demonstrate that it can either excite a SW beam with tailored wavefront or generate a far-field PW with pre-designed wavefront, as shined by CP waves with different helicity. Our work opens the door to achieving simultaneous controls on far- and near-field electromagnetic environments based on a single ultra-compact platform.

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6

Balakshy, Vladimir I. "Acousto-optic visualization of optical wavefronts [Invited]." Applied Optics 57, no. 10 (2018): C56. http://dx.doi.org/10.1364/ao.57.000c56.

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7

Ding, Guowen, Ke Chen, Xinyao Luo, et al. "Direct routing of intensity-editable multi-beams by dual geometric phase interference in metasurface." Nanophotonics 9, no. 9 (2020): 2977–87. http://dx.doi.org/10.1515/nanoph-2020-0203.

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AbstractControlling spin electromagnetic waves by ultra-thin Pancharatnam-Berry (PB) metasurfaces show promising prospects in the optical and wireless communications. One of the major challenge is to precisely control over the complex wavefronts and spatial power intensity characteristics without relying on massive algorithm optimizations, which requires independent amplitude and phase tuning. However, traditional PB phase can only provide phase control. Here, by introducing the interference of dual geometric phases, we propose a metasurface that can provide arbitrary amplitude and phase manipulations on meta-atom level for spin waves, achieving direct routing of multi-beams with desired intensity distribution. As the experimental demonstration, we design two microwave metasurfaces for respectively controlling the far-field and near-field multi-beam generations with desired spatial scatterings and power allocations, achieving full control of both sophisticated wavefronts and their energy distribution. This approach to directly generate editable spatial beam intensity with tailored wavefront may pave a way to design advanced meta-devices that can be potentially used in many real-world applications, such as multifunctional, multiple-input multiple-output and high-quality imaging devices.

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8

Tesch, Jonathan, and Steve Gibson. "Optimal and adaptive control of aero-optical wavefronts for adaptive optics." Journal of the Optical Society of America A 29, no. 8 (2012): 1625. http://dx.doi.org/10.1364/josaa.29.001625.

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9

Jefferys, W. H., G. F. Benedict, R. L. Duncombe, et al. "Current Status of the Astrometric Capabilities of the Hubble Space Telescope Fine Guidance Sensors." International Astronomical Union Colloquium 127 (1991): 68–76. http://dx.doi.org/10.1017/s0252921100063582.

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AbstractThe Fine Guidance Sensors (FGSs) are the instrument of choice for most astrometric measurements with the Hubble Space Telescope (HST). The observed amount of spherical aberration in the Ritchey Chretien optical system does not affect positional measurements with perfectly aligned FGSs because they are interferometers. The FGSs combine wavefronts from points in the exit pupil with other points which are at the same radial distance from the optical axis. Asymmetric aberrations such as coma and astigmatism do affect the measured positions. The current knowledge of the HST wavefront error, the FGS operation and the implications for milliarcsecond relative astrometry are discussed. It is still planned to use the HST to tie the HIPPARCOS and VLBI Reference Frames together at the few milliarcsecond level.

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10

Yang, Jinsheng, Ling Wei, Hongli Chen, Xuejun Rao, and Changhui Rao. "Absolute calibration of Hartmann-Shack wavefront sensor by spherical wavefronts." Optics Communications 283, no. 6 (2010): 910–16. http://dx.doi.org/10.1016/j.optcom.2009.11.022.

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11

Badon, Amaury, Victor Barolle, Kristina Irsch, A. Claude Boccara, Mathias Fink, and Alexandre Aubry. "Distortion matrix concept for deep optical imaging in scattering media." Science Advances 6, no. 30 (2020): eaay7170. http://dx.doi.org/10.1126/sciadv.aay7170.

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In optical imaging, light propagation is affected by the inhomogeneities of the medium. Sample-induced aberrations and multiple scattering can strongly degrade the image resolution and contrast. On the basis of a dynamic correction of the incident and/or reflected wavefronts, adaptive optics has been used to compensate for those aberrations. However, it only applies to spatially invariant aberrations or to thin aberrating layers. Here, we propose a global and noninvasive approach based on the distortion matrix concept. This matrix basically connects any focusing point of the image with the distorted part of its wavefront in reflection. A singular value decomposition of the distortion matrix allows to correct for high-order aberrations and forward multiple scattering over multiple isoplanatic modes. Proof-of-concept experiments are performed through biological tissues including a turbid cornea. We demonstrate a Strehl ratio enhancement up to 2500 and recover a diffraction-limited resolution until a depth of 10 scattering mean free paths.

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12

Tesch, Jonathan, Steve Gibson, and Michel Verhaegen. "Receding-horizon adaptive control of aero-optical wavefronts." Optical Engineering 52, no. 7 (2013): 071406. http://dx.doi.org/10.1117/1.oe.52.7.071406.

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13

Whiteley, Matthew R., David J. Goorskey, and Richard Drye. "Aero-optical jitter estimation using higher-order wavefronts." Optical Engineering 52, no. 7 (2013): 071411. http://dx.doi.org/10.1117/1.oe.52.7.071411.

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14

Nanfang Yu, P. Genevet, F. Aieta, et al. "Flat Optics: Controlling Wavefronts With Optical Antenna Metasurfaces." IEEE Journal of Selected Topics in Quantum Electronics 19, no. 3 (2013): 4700423. http://dx.doi.org/10.1109/jstqe.2013.2241399.

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15

HARRIS, W. F. "Wavefronts and Their Propagation in Astigmatic Optical Systems." Optometry and Vision Science 73, no. 9 (1996): 605–12. http://dx.doi.org/10.1097/00006324-199609000-00007.

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16

Babilotte, Philippe. "Simulation of multiwavelength conditions in laser picosecond ultrasonics." SIMULATION 97, no. 7 (2021): 473–84. http://dx.doi.org/10.1177/0037549721996451.

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Complete numerical simulations are given under SciLab® and MATLAB® coding environments, concerning propagative acoustic wavefronts, for laser picosecond ultrasonics under multiwavelength conditions. Simulations of the deformation field and its propagation into bulk material are given under different wavelength configurations for optical pump and probe beams, which are used to generate and to detect the acoustic signal. Complete insights concerning the dynamics of the acoustic waves are given, considering the absence of carrier diffusions into the material. Several numerical approaches are proposed concerning both the functions introduced to simulate the wavefront ( Heaviside or error) and the coding approach (linear/vectorized/ Oriented Object Programming), under the pure thermo-elastic approach.

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17

Yang, Bo, Zichen Fan, He Yu, Haidong Hu, and Zhaohua Yang. "A New Method for Analyzing Aero-Optical Effects with Transient Simulation." Sensors 21, no. 6 (2021): 2199. http://dx.doi.org/10.3390/s21062199.

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Aero-optical effects reduce the accuracy of optical sensors on high-speed aircraft. Current research usually focuses on light refraction caused by large-scale density structures in turbulence. A method for analyzing photon energy scattering caused by micro-scale structures is proposed in this paper, which can explain the macro image distortion caused by moving molecules in inhomogeneous airflow. Quantitative analysis of the propagation equation indicates that micro-scale structures may contribute more to the wavefront distortion than the widely considered large-scale structures. To analyze the micro mechanism of aero-optical effects, a transient simulator is designed based on the scaling model of transient distorted wavefronts and the artificial vortex structure. The simulation results demonstrate that correct aero-optical phenomena can be obtained from the micro mechanism of photon energy scattering. Examples of using the transient simulator to optimize the parameters of the star sensor on a hypersonic vehicle are provided. The proposed analysis method for micro-scale structures provides a new idea for studying the aero-optical effects.

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18

Barton, David, Jack Hu, Jefferson Dixon, et al. "High-Q nanophotonics: sculpting wavefronts with slow light." Nanophotonics 10, no. 1 (2020): 83–88. http://dx.doi.org/10.1515/nanoph-2020-0510.

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AbstractDensely interconnected, nonlinear, and reconfigurable optical networks represent a route to high-performance optical computing, communications, and sensing technologies. Dielectric nanoantennas are promising building blocks for such architectures since they can precisely control optical diffraction. However, they are traditionally limited in their nonlinear and reconfigurable responses owing to their relatively low-quality factor (Q-factor). Here, we highlight new and emerging design strategies to increase the Q-factor while maintaining control of optical diffraction, enabling unprecedented spatial and temporal control of light. We describe how multipolar modes and bound states in the continuum increase Q and show how these high-Q nanoantennas can be cascaded to create almost limitless resonant optical transfer functions. With high-Q nanoantennas, new paradigms in reconfigurable wavefront-shaping, low-noise, multiplexed biosensors and quantum transduction are possible.

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19

Chambouleyron, V., O. Fauvarque, P. Janin-Potiron, et al. "Pyramid wavefront sensor optical gains compensation using a convolutional model." Astronomy & Astrophysics 644 (November 24, 2020): A6. http://dx.doi.org/10.1051/0004-6361/202037836.

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Context. Extremely large telescopes are overwhelmingly equipped with pyramid wavefront sensors (PyWFS) over the more widely used Shack–Hartmann wavefront sensor to perform their single-conjugate adaptive optics (SCAO) mode. The PyWFS, a sensor based on Fourier filtering, has proven to be highly successful in many astronomy applications. However, this sensor exhibits non-linear behaviours that lead to a reduction of the sensitivity of the instrument when working with non-zero residual wavefronts. This so-called optical gains (OG) effect, degrades the closed-loop performance of SCAO systems and prevents accurate correction of non-common path aberrations (NCPA). Aims. In this paper, we aim to compute the OG using a fast and agile strategy to control PyWFS measurements in adaptive optics closed-loop systems. Methods. Using a novel theoretical description of PyWFS, which is based on a convolutional model, we are able to analytically predict the behaviour of the PyWFS in closed-loop operation. This model enables us to explore the impact of residual wavefront errors on particular aspects such as sensitivity and associated OG. The proposed method relies on the knowledge of the residual wavefront statistics and enables automatic estimation of the current OG. End-to-end numerical simulations are used to validate our predictions and test the relevance of our approach. Results. We demonstrate, using on non-invasive strategy, that our method provides an accurate estimation of the OG. The model itself only requires adaptive optics telemetry data to derive statistical information on atmospheric turbulence. Furthermore, we show that by only using an estimation of the current Fried parameter r0 and the basic system-level characteristics, OGs can be estimated with an accuracy of less than 10%. Finally, we highlight the importance of OG estimation in the case of NCPA compensation. The proposed method is applied to the PyWFS. However, it remains valid for any wavefront sensor based on Fourier filtering subject from OG variations.

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20

Yamanouchi, Yoshio, Yuanna Cheng, Patrick J. Tchou, and Igor R. Efimov. "The mechanisms of the vulnerable window: the role of virtual electrodes and shock polarity." Canadian Journal of Physiology and Pharmacology 79, no. 1 (2001): 25–33. http://dx.doi.org/10.1139/y00-115.

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Vulnerability and defibrillation are mechanistically dependent upon shock strength, polarity, and timing. We have recently demonstrated that shock-induced virtual electrode polarization (VEP) may induce reentry. However, it remains unclear how the VEP mechanism may explain the vulnerable window and polarity dependence of vulnerability. We used a potentiometric dye and optical mapping to assess the anterior epicardial electrical activity of Langendorff-perfused rabbit hearts (n = 7) during monophasic shocks (±100 V and ±200 V, duration of 8 ms) applied from a transvenous defibrillation lead at various coupling intervals. Arrhythmias were induced in a coupling interval and shock polarity dependent manner: (i) anodal and cathodal shocks induced arrhythmias in 33.2 ± 30.1% and 53.1 ± 39.3% cases (P < 0.01), respectively, and (ii) the vulnerable window was located near the T-wave. Optical maps revealed that VEP was also modulated by the coupling interval and shock polarity. Recovery of excitability produced by negative polarization, known as de-excitation, and the resulting reentry was more readily achieved during the relative refractory period than the absolute refractory period. Furthermore, anodal shocks produced wavefronts propagating in an inward direction with respect to the electrode, whereas cathodal shocks propagated in an outward direction. Wavefronts produced by anodal shocks were more likely to collide and annihilate each other than those caused by cathodal shocks. The probability of degeneration of the VEP-induced phase singularity into a sustained arrhythmia depends upon the gradient of VEP and the direction of the VEP-induced wavefront. The VEP gradient depends upon the coupling interval, while the direction depends upon shock polarity; these factors explain the vulnerable window and polarity-dependence of vulnerability, respectively.Key words: defibrillation, stimulation, arrhythmia, cardiac vulnerability, optical mapping.

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21

Faghihi, Azin, Jonathan Tesch, and Steve Gibson. "Identified state-space prediction model for aero-optical wavefronts." Optical Engineering 52, no. 7 (2013): 071419. http://dx.doi.org/10.1117/1.oe.52.7.071419.

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22

Babilotte, Philippe. "A Basic Complete Numerical Toolbox for Picosecond Ultrasonics." Acoustics 1, no. 1 (2019): 137–55. http://dx.doi.org/10.3390/acoustics1010010.

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A complete numerical complete toolbox is proposed concerning the simulation of photo-induced propagative mechanical wave, and concerning the optical reflectometric measured response of the material, which is initially exposed to a first pump laser beam that photo-induces the acoustic wavefronts. The deformation field and its propagation into a bulk material are simulated. Based on this field expression, the complex transient reflectivity is given for a medium considered as homogeneous. The real part of this quantity permits afterwards to propose a numerical simulation of the transient reflectivity, which corresponds to the optical signal measured during experimental works. The frequency acoustic spectrum is simulated and successfully compared to the measured frequency spectrum. For the first time, numerical complete developments are explicitly proposed and fully-developed under the SciLab ® environment, related to the simulation of laser-induced picosecond acoustic wavefront photogenerated through an opto-acoustic transduction process (ultrasonics and pretersonics).

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23

Van Grinsven, Kari L., Alireza Ousati Ashtiani, and Hongrui Jiang. "Flexible Electrowetting-on-Dielectric Microlens Array Sheet." Micromachines 10, no. 7 (2019): 464. http://dx.doi.org/10.3390/mi10070464.

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We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a polydimethylsiloxane (PDMS) substrate, which allows the lens array to operate as a reconfigurable optical system. In particular, we observed a significant increase in the field of view (FOV) of the system to 40.4° by wrapping it on a cylindrical surface as compared to the FOV of 21.5° obtained by the array on a planer surface. We also characterized the liquid lenses of the system, observing a range of focus length from 20.2 mm to 9.2 mm as increased voltage was applied to each EWOD lens. A Shack–Hartmann wavefront sensor (SHWS) was used to measure the wavefront of the lens as it was actuated, and the aberrations of the lens were assessed by reporting the Zernike coefficients of the wavefronts.

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24

Zhang, Cuilian, and Donghe Pei. "Duality between wavefronts and caustics." Optik 230 (March 2021): 166371. http://dx.doi.org/10.1016/j.ijleo.2021.166371.

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25

BLENDOWSKE, RALF, and EVA ACOSTA. "Paraxial Propagation of Astigmatic Wavefronts Through Noncoaxial Astigmatic Optical Systems." Optometry and Vision Science 83, no. 2 (2006): 119–22. http://dx.doi.org/10.1097/01.opx.0000200676.86923.9c.

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26

Ge, Zongtao, Takayuki Saito, Minoru Kurose, Hideo Kanda, Kazuhisa Arakawa, and Mitsuo Takeda. "Precision interferometry for measuring wavefronts of multi-wavelength optical pickups." Optics Express 16, no. 1 (2008): 133. http://dx.doi.org/10.1364/oe.16.000133.

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27

CHASTANG, JEAN-CLAUDE A., and RIDA T. FAROUKI. "The Mathematical Evolution of Wavefronts." Optics and Photonics News 3, no. 1 (1992): 20. http://dx.doi.org/10.1364/opn.3.1.000020.

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28

Min, Wan, and Su Yi. "Turbulence-induced zernike aberrations of optical wavefronts in partial adaptive compensation." Journal of Modern Optics 48, no. 10 (2001): 1559–67. http://dx.doi.org/10.1080/09500340108231784.

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29

Paroli, B., M. Siano, and M. A. C. Potenza. "The local intrinsic curvature of wavefronts allows to detect optical vortices." Optics Express 27, no. 13 (2019): 17550. http://dx.doi.org/10.1364/oe.27.017550.

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30

Cabrera-Rosas, Omar de Jesús, Ernesto Espíndola-Ramos, Salvador Alejandro Juárez-Reyes, et al. "Wavefronts and caustic associated with Durnin’s beams." Journal of Optics 19, no. 1 (2016): 015603. http://dx.doi.org/10.1088/2040-8986/19/1/015603.

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31

Kamali, Seyedeh Mahsa, Ehsan Arbabi, Amir Arbabi, and Andrei Faraon. "A review of dielectric optical metasurfaces for wavefront control." Nanophotonics 7, no. 6 (2018): 1041–68. http://dx.doi.org/10.1515/nanoph-2017-0129.

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AbstractDuring the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here, we review some of these recent developments, with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then, we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome.

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32

Berujon, Sebastien, Eric Ziegler, and Peter Cloetens. "X-ray pulse wavefront metrology using speckle tracking." Journal of Synchrotron Radiation 22, no. 4 (2015): 886–94. http://dx.doi.org/10.1107/s1600577515005433.

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An instrument allowing the quantitative analysis of X-ray pulsed wavefronts is presented and its processing method explained. The system relies on the X-ray speckle tracking principle to accurately measure the phase gradient of the X-ray beam from which beam optical aberrations can be deduced. The key component of this instrument, a semi-transparent scintillator emitting visible light while transmitting X-rays, allows simultaneous recording of two speckle images at two different propagation distances from the X-ray source. The speckle tracking procedure for a reference-less metrology mode is described with a detailed account on the advanced processing schemes used. A method to characterize and compensate for the imaging detector distortion, whose principle is also based on speckle, is included. The presented instrument is expected to find interest at synchrotrons and at the new X-ray free-electron laser sources under development worldwide where successful exploitation of beams relies on the availability of an accurate wavefront metrology.

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33

Hirano, Takashi, Yuki Morioka, Shotaro Matsumura, et al. "Surface Finishing Method Using Plasma Chemical Vaporization Machining for Narrow Channel Walls of X-Ray Crystal Monochromators." International Journal of Automation Technology 13, no. 2 (2019): 246–53. http://dx.doi.org/10.20965/ijat.2019.p0246.

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Channel-cut Si crystals are useful optical devices for providing monochromatic X-ray beams with extreme angular stability. Owing to difficulties in the high-precision surface finishing of narrow-channel inner walls of the crystals, typical channel-cut crystals have considerable residual subsurface crystal damage and/or roughness on their channel-wall reflection surfaces that decrease intensity and distort the wavefronts of the reflected X-rays. This paper proposes a high-precision surface finishing method for the narrow-channel inner walls based on plasma chemical vaporization machining, which is a local etching technique using atmospheric-pressure plasma. Cylinder- and nozzle-shaped electrodes were designed for channel widths of more than 5 and 3 mm, respectively. We optimized process conditions for each electrode using commercial Si wafers, and obtained a removal depth of 10 μm with a surface flatness and roughness of less than 1 μm and 1 nmRMS, respectively, which should allow the damaged layers to be fully removed while maintaining the wavefront of coherent X-rays.

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34

Mitsuhashi, Toshiyuki, Sigenori Hiramatsu, Naoya Takeuchi, Masahide Itoh, and Toyohiko Yatagai. "Activities of optical laboratories 1 and 2 at the Photon Factory." Journal of Synchrotron Radiation 5, no. 3 (1998): 842–44. http://dx.doi.org/10.1107/s0909049597014295.

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Recent activities at optical laboratories 1 and 2 at the Photon Factory are presented. The activities are (i) construction of optical laboratory 1, (ii) reconstruction of optical laboratory 2, (iii) construction of a visible synchrotron radiation beam extraction mirror made of beryllium, (iv) small-beam-profile measurement by means of the image restoration method, (v) application of the adaptive optical system for correction of distorted wavefronts caused by deformation of the extraction mirror, (vi) construction of a synchrotron radiation interferometer for investigation of the spatial coherency of the visible synchrotron radiation beam and its application to the measurement of vertical beam profile and size.

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35

Karasawa, Naoki. "Chirped pulse digital holography for measuring the sequence of ultrafast optical wavefronts." Optics Communications 413 (April 2018): 19–23. http://dx.doi.org/10.1016/j.optcom.2017.12.021.

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36

Breugnot, S., M. Defour, H. Rajbenbach, and J. P. Huignard. "Heterodyne detection of weak optical wavefronts burried in a photorefractive fanning noise." Optics Communications 104, no. 1-3 (1993): 118–22. http://dx.doi.org/10.1016/0030-4018(93)90117-n.

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37

Julián-Macías, Israel, Carolina Rickenstorff-Parrao, Omar de Jesús Cabrera-Rosas, et al. "Wavefronts and caustics associated with Mathieu beams." Journal of the Optical Society of America A 35, no. 2 (2018): 267. http://dx.doi.org/10.1364/josaa.35.000267.

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38

Chen, Yang, Long Li, Cheng Zhu, et al. "Design of wavefronts transformers with complementary media." Microwave and Optical Technology Letters 56, no. 4 (2014): 875–79. http://dx.doi.org/10.1002/mop.28224.

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39

Zhou, Hongqiang, Yongtian Wang, Xiaowei Li, et al. "Switchable active phase modulation and holography encryption based on hybrid metasurfaces." Nanophotonics 9, no. 4 (2020): 905–12. http://dx.doi.org/10.1515/nanoph-2019-0519.

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AbstractMetasurfaces are planar devices containing delicately designed nanoantenna or resonator arrays that allow for beam shaping, super resolution imaging, and holography. Hybrid metasurface – by integrating with tunable materials such as two-dimensional materials and phase change materials (PCMs) – provides a potential platform for active modulation of wavefronts. Specifically, PCMs can flexibly switch between crystalline and amorphous states with nonvolatile property under external stimuli and provide a large refractive permittivity contrast. Using metasurfaces based on PCM to manipulate wavefronts may provide new opportunities for switchable functionalities. Here, we propose two types of metasurface devices based on whole PCM films to realize switchable holography and simultaneous phase and interference encryption. This feature can be used to encrypt information in a switched state and store camouflage information in the other state by simply applying external thermal stimuli to the entire metasurface. This method can be applied in areas such as beam shaping, optical encryption, and anti-counterfeiting.

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Janipour, Mohsen, and Kürşat Şendur. "Enhancing Spectral Reflection through Controlled Phase Distribution Using Doped Polar-Dielectric Metasurfaces." Materials 13, no. 9 (2020): 2007. http://dx.doi.org/10.3390/ma13092007.

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Controlling the phase distribution of wavefronts using optical metasurfaces has led to interesting optical properties and applications. Here, we explore the control of phase distribution through polar-dielectric metasurfaces composed of doped SiC nanosphere arrays. We investigate the impact of doping concentration on the optical properties of SiC nano-spheres. Our results indicate that increasing the doping of SiC nanoparticles influenced electric dipolar resonances, whereas it did not change the dipolar resonances. Using this concept, we numerically studied the extension of this idea to form metasurface arrays of single, dimer and linear trimers of the doped SiC nano-spheres. Using different doping schemes, we studied the improvement of the reflectivity at frequencies greater than the longitudinal optical phonon frequency.

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Aguirre, Roberto C., and Haris J. Catrakis. "Aero-Optical Wavefronts and Scale-Local Characterization in Large-Reynolds-Number Compressible Turbulence." AIAA Journal 42, no. 10 (2004): 1982–90. http://dx.doi.org/10.2514/1.548.

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Fuerst, Martin E., Ernst Csencsics, Nikolaus Berlakovich, and Georg Schitter. "Automated Measurement of Highly Divergent Optical Wavefronts With a Scanning Shack–Hartmann Sensor." IEEE Transactions on Instrumentation and Measurement 70 (2021): 1–9. http://dx.doi.org/10.1109/tim.2020.3038002.

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Zhang Xinyu, 张新宇, 李记赛 Li Jisai, 季安 Ji An, and 谢长生 Xie Changsheng. "Emitting Complex Wavefronts by Refractive Micro-Optics Structures." Chinese Journal of Lasers 35, no. 8 (2008): 1156–60. http://dx.doi.org/10.3788/cjl20083508.1156.

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Diaz Meza, Carlos Fernando, Yezid Torres Moreno, and Cristian Hernando Acevedo Caceres. "Superposition of two optical vortices with opposite integer or non-integer orbital angular momentum." Ingeniería e Investigación 36, no. 1 (2016): 79–84. http://dx.doi.org/10.15446/ing.investig.v36n1.43948.

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<p>This work develops a brief proposal to achieve the superposition of two opposite vortex beams, both with integer or non-integer mean value of the orbital angular momentum. The first part is about the generation of this kind of spatial light distributions through a modified Brown and Lohmann’s hologram. The inclusion of a simple mathematical expression into the pixelated grid’s transmittance function, based in Fourier domain properties, shifts the diffraction orders counterclockwise and clockwise to the same point and allows the addition of different modes. The strategy is theoretically and experimentally validated for the case of two opposite rotation helical wavefronts.</p>

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Normatov, Alexander, Boris Spektor, and Joseph Shamir. "The quadratic phase factor of tightly focused wavefronts." Optics Communications 283, no. 19 (2010): 3585–90. http://dx.doi.org/10.1016/j.optcom.2010.05.057.

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Tsvetkov, A. D., and N. I. Potapova. "'Spekforms' — sintered components for shaping laser radiation wavefronts." Quantum Electronics 24, no. 1 (1994): 78–80. http://dx.doi.org/10.1070/qe1994v024n01abeh000024.

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Abdollahramezani, Sajjad, Omid Hemmatyar, and Ali Adibi. "Meta-optics for spatial optical analog computing." Nanophotonics 9, no. 13 (2020): 4075–95. http://dx.doi.org/10.1515/nanoph-2020-0285.

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AbstractRapidly growing demands for high-performance computing, powerful data processing, and big data necessitate the advent of novel optical devices to perform demanding computing processes effectively. Due to its unprecedented growth in the past two decades, the field of meta-optics offers a viable solution for spatially, spectrally, and/or even temporally sculpting amplitude, phase, polarization, and/or dispersion of optical wavefronts. In this review, we discuss state-of-the-art developments, as well as emerging trends, in computational metastructures as disruptive platforms for spatial optical analog computation. Two fundamental approaches based on general concepts of spatial Fourier transformation and Green’s function (GF) are discussed in detail. Moreover, numerical investigations and experimental demonstrations of computational optical surfaces and metastructures for solving a diverse set of mathematical problems (e.g., integrodifferentiation and convolution equations) necessary for on-demand information processing (e.g., edge detection) are reviewed. Finally, we explore the current challenges and the potential resolutions in computational meta-optics followed by our perspective on future research directions and possible developments in this promising area.

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Holsteen, Aaron L., Ahmet Fatih Cihan, and Mark L. Brongersma. "Temporal color mixing and dynamic beam shaping with silicon metasurfaces." Science 365, no. 6450 (2019): 257–60. http://dx.doi.org/10.1126/science.aax5961.

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Metasurfaces offer the possibility to shape optical wavefronts with an ultracompact, planar form factor. However, most metasurfaces are static, and their optical functions are fixed after the fabrication process. Many modern optical systems require dynamic manipulation of light, and this is now driving the development of electrically reconfigurable metasurfaces. We can realize metasurfaces with fast (>105 hertz), electrically tunable pixels that offer complete (0- to 2π) phase control and large amplitude modulation of scattered waves through the microelectromechanical movement of silicon antenna arrays created in standard silicon-on-insulator technology. Our approach can be used to realize a platform technology that enables low-voltage operation of pixels for temporal color mixing and continuous, dynamic beam steering and light focusing.

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He, Yuchu, and George V. Eleftheriades. "Rotated infrared antenna transmitarray for the manipulation of circularly polarized wavefronts." EPJ Applied Metamaterials 1 (2014): 8. http://dx.doi.org/10.1051/epjam/2015002.

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An IR optical transmitarray is presented based on Antenna Array Sheet (AAS) for the manipulation of circularly polarized light. The unit cell of the transmitarray comprises three layers of metallic elliptical patches. Complete phase control is achieved through the local rotation of each unit cell. Thin refraction and focusing transmitarrays of this sort are demonstrated at infrared frequencies. Moreover, a new concept for realizing a polarization-discriminating device is introduced based on a flat refracting lens. These devices are compatible with current fabrication technology and can become crucial for the integration with other IR and nano-photonic devices.

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Mah, Merlin L., and Joseph J. Talghader. "Decomposition of aberrated or turbulent wavefronts into a spatial mode spectrum using optical cavities." Applied Optics 58, no. 16 (2019): 4288. http://dx.doi.org/10.1364/ao.58.004288.

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