Results 51 to 60 of about 6,059 (275)

Ellipticity‐Controlled Exceptional Points and Cross‐Polarized Phase Singularities in Multi‐Layer Silicon Guided Mode Resonant Metasurfaces

Advanced Optical Materials, EarlyView.
Omni‐polarizers that pull all input polarization states to an elliptical or linear polarization can be made using highly resonant bi‐layer metasurfaces. The ellipticity of the selected polarization can be controlled by choosing the layer separation.
Ben Goldberg, Shuang Zhang, Mark Lawrence   +2 more
wiley   +1 more source

Adaptive particle image velocimetry based on sharpness metrics

Journal of the European Optical Society-Rapid Publications, 2018
Background Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive ...
M. Teich, J. Grottke, H. Radner, L. Büttner, J. W. Czarske   +4 more
doaj   +1 more source

Topology Optimization Enables Freeform Matrix Fourier Optics

Advanced Optical Materials, EarlyView.
A topology‐optimized freeform metasurface is designed and fabricated to realize matrix Fourier optics, enabling the diffraction of multiple polarization states into distinct far‐field orders. By combining forward design with gradient‐based inverse optimization, high polarization contrast of up to 98.7% is achieved.
Yu‐Tzu Liu, Yun‐Chien Wu, Chang‐Yi Lin, Huan‐Teng Su, Yu‐Qi Zhou, Yao‐Wei Huang   +5 more
wiley   +1 more source

High‐Isolation LCoS‐Based Optical Switch with Phase Hologram Parameter Optimization

Advanced Photonics Research, EarlyView.
A 1 × 9 liquid crystal on silicon (LCoS)‐based optical switch is experimentally demonstrated, revealing that the worst‐case port isolation exceeds 37 dB within the wavelength range of 1460–1540 nm. This work offers an alternative route for the development of optical switches with a large number of ports and high isolation, applicable to large‐capacity ...
Linbojie Huang, Zichen Liu, Lin Wu, Zhongyi Li, Juan Chen, Chao Li, Jin Tao, Zhixue He, Shaohua Yu   +8 more
wiley   +1 more source

Wavefront Derived Refraction and Full Eye Biometry in Pseudophakic Eyes. [PDF]

PLoS ONE, 2016
To assess wavefront derived refraction and full eye biometry including ciliary muscle dimension and full eye axial geometry in pseudophakic eyes using spectral domain OCT equipped with a Shack-Hartmann wavefront sensor.Twenty-eight adult subjects (32 ...
Xinjie Mao, James T Banta, Bilian Ke, Hong Jiang, Jichang He, Che Liu, Jianhua Wang   +6 more
doaj   +1 more source

High‐Numerical‐Aperture, 3D‐Printed All‐Dielectric Harmonic Diffraction Metalens in the Sub‐THz Frequency Range

Advanced Photonics Research, EarlyView.
Herein, a compact all‐dielectric metalens operating at dual sub‐THz frequencies is presented, addressing key challenges in terahertz device miniaturization. Utilizing commercial 3D printing, the metalens achieves high numerical aperture and broadband functionality.
Kobi Ben Atar, Jacob Engelberg, Uriel Levy   +2 more
wiley   +1 more source

Wavefront sensor and wavefront corrector matching in adaptive optics

Optics Express, 2007
Matching wavefront correctors and wavefront sensors by minimizing the condition number and mean wavefront variance is proposed. The particular cases of two continuous-sheet deformable mirrors and a Shack-Hartmann wavefront sensor with square packing geometry are studied in the presence of photon noise, background noise and electronics noise.
openaire   +3 more sources

Switchable Terahertz Beam Steering with Near‐Perfect Ordinary Transmission

Advanced Photonics Research, EarlyView.
This study introduces a reconfigurable metasurface that enables switchable terahertz beam steering upon actuation by a global temperature change. At room temperature, it achieves a true “OFF” state with nearly 100% transmission, behaving as if the metasurface is not present, thereby not distorting incoming light.
Zhixiang Huang, Jie Ji, Ke Ma, Eric Herrmann, Riad Yahiaoui, S M Jahadun Nobi, Fei Ding, Peter Uhd Jepsen, Thomas A. Searles, Binbin Zhou, Zizwe Chase, Xi Wang   +11 more
wiley   +1 more source

Incoherent Digital Holography Empowered by Wavefront and Information Engineering: A Review

Advanced Photonics Research, EarlyView.
Advancements in incoherent digital holography (IDH) have been achieved via wavefront engineering (using spatial light modulators, diffractive optics, and metasurfaces) and information engineering (using compressive sensing and deep learning). This paper presents an overview of IDH with wavefront and information engineering, paving the way toward its ...
Teruyoshi Nobukawa
wiley   +1 more source

Object wave reconstruction by speckle illumination and phase retrieval [PDF]

Journal of the European Optical Society-Rapid Publications, 2009
An innovative setup for the speckle-based phase retrieval method is proposed. In the conventional setup, a plane wave illuminates the test object and the transmitted wavefront is incident on a diffuser aperture generating a speckle field.
Almoro P. F., Hanson S. G.
doaj   +1 more source