Results 101 to 110 of about 82,170 (356)

Femtosecond Pulse Shaping with Semiconductor Huygens' Metasurfaces

Advanced Optical Materials, EarlyView.
Spatially variant silicon Huygens' metasurfaces enable femtosecond pulse shaping by tailoring the spectral phase and amplitude of incident pulses. Two key functionalities are demonstrated: temporal stretching and pulse splitting of an input Gaussian pulse.
Katsuya Tanaka, Dennis Arslan, Maximilian Weissflog, Nils Geib, Kristin Gerold, Adriana Szeghalmi, Mario Ziegler, Falk Eilenberger, Thomas Pertsch, Roland Schiek, Isabelle Staude   +10 more
wiley   +1 more source

Angle‐ and Polarization‐Tolerant Metasurface Designs Based on the Aperiodic Tiling

Advanced Optical Materials, EarlyView.
A novel aperiodic metasurface design is introduced to mitigate the inherent angle and polarization sensitivity of conventional metasurfaces. By employing a recently discovered aperiodic tiling approach, identical elliptical scatterers are arranged with systematic variations in their spacing and orientation, effectively minimizing spectral reflectance ...
Minyeul Lee, Suwan Jeon, Jonghwa Shin
wiley   +1 more source

Rapid Electro‐Thermal Micro‐Actuation of Flat Optics Enabled by Laser‐Induced Graphene on Colorless Polyimide Substrates

Advanced Optical Materials, EarlyView.
Laser‐induced graphene (LIG) on a colorless polyimide (CPI) substrate functions as both an electrical heater and a heat spreader, enabling rapid electro‐thermo‐optic actuation. The system achieves reflective beam scanning up to 2 kHz and diffractive beam steering with 0.5‐millidegree resolution and a 0.9 s response time, showcasing LIG‐CPI as a soft ...
Byunggi Kim, Younggeun Lee, Dongwook Yang, Kazuyoshi Fushinobu, Young‐Jin Kim, Masahiro Nomura   +5 more
wiley   +1 more source

Effect of Core Geometry on Frequency Correlations and Channel Capacity of a Multimode Optical Fiber

Advanced Photonics Research, EarlyView.
Structured wavefronts focused at the output of multimode fibers reveal a distinct spatial dependence of frequency correlation bandwidth between circular and rectangular cores. Unlike conventional circular‐core fibers, rectangular‐core fibers maintain uniform bandwidth across all transverse locations, enabling over a 20% increase in channel capacity for
Henry C. Hammer, Ravitej Uppu
wiley   +1 more source

Photochromic Organic–Inorganic Material for Focusable Adaptive Lenses Fabrication

Advanced Photonics Research, EarlyView.
This study investigates a zirconia‐based hybrid organic–inorganic material incorporating dithienylethene molecules for adaptive optics. It offers excellent photochromic properties, thermal stability, and adjustable thickness, enabling effective refractive index modulation.
Giorgia Franchin, Veronica Torresan, Alessandro Gandin, Rossella Castagna, Chiara Bertarelli, Stefano Bonora, Giovanna Brusatin   +6 more
wiley   +1 more source

Spatially Controlled Optical Vortex Generation Using Low‐Loss Antimony Telluride Metasurfaces

Advanced Photonics Research, EarlyView.
The spatially varying vortex beams with the customizable propagation trajectory and the controllable topological charge evolution are demonstrated using the Sb2Te3‐based plasmonic metasurfaces. Benefiting from the dispersion‐free property of the Pancharatnam–Berry phase and the broadband response of polarization conversion efficiency of the nanobrick ...
Chengsen Yang, Shuguang Zhu, Huishan Ma, Weiwei Tang, Yiming Yu, Zexing Zheng, Jie Hong, Changlong Liu, Songyuan Ding, Jiale He, Guanhai Li, Xiaoshuang Chen   +11 more
wiley   +1 more source

Extraction of Inherent Amplitude Mode from a Light Beam

Advanced Photonics Research, EarlyView.
Mode extraction is the inverse process of the double‐beam superposition principle in classical optics. While polarization mode extraction has been successfully demonstrated using an m‐order vector vortex beam, this article demonstrates the amplitude mode extraction of a light beam.
Zhiyang Xia, Xiaoyu Weng, Liwei Liu, Jun He, Changrui Liao, Yiping Wang, Junle Qu   +6 more
wiley   +1 more source

Two-photon lensless micro-endoscopy with in-situ wavefront correction. [PDF]

Optics Express, 2018
Multi-core fiber-bundle endoscopes provide a minimally-invasive solution for deep tissue imaging and opto-genetic stimulation, at depths beyond the reach of conventional microscopes.
Uri Weiss, O. Katz
semanticscholar   +1 more source

Wavefront sensing based on the inverted Hartmann sensor [PDF]

arXiv, 2019
The classic Hartmann test consists of an array of holes to reconstruct the wavefront from the local deviation of each focal spot, and Shack-Hartmann sensor improved that with an array of microlenses. This array of microlenses imposes practical limitations when the wavefront is not into of visible wavelengths, e.g., the fabrication of these. Instead, we
arxiv  

Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing [PDF]

arXiv, 2020
Laser guide stars (LGS) are used in many adaptive optics systems to extend sky coverage. The most common wavefront sensor used in combination with a LGS is a Shack-Hartmann wavefront sensor (SHWFS). The Shack-Hartmann has a major disadvantage for extended source wavefront sensing because it directly samples the image.
arxiv