Results 61 to 70 of about 556,769 (269)

Silicon metasurfaces for third harmonic geometric phase manipulation and multiplexed holography [PDF]

Nano Letters (2019), 2019
Nonlinear wavefront control is a crucial requirement in realizing nonlinear optical applications with metasurfaces. Numerous aspects of nonlinear frequency conversion and wavefront control have been demonstrated for plasmonic metasurfaces. However, several disadvantages limit their applicability in nonlinear nanophotonics, including high dissipative ...
arxiv   +1 more source

Wavefront reconfigurable metasurface through graphene micro-ribbons with resonant strategy

Results in Physics, 2023
The majority of metasurfaces are static in their optical properties due to the principles of their construction. For the effect of wavefront reconfigurable, graphene provides the opportunity for adjustability via gate biasing.
Kai He, Tigang Ning, Jing Li, Li Pei, Jingjing Zheng, Jianshuai Wang, Bing Bai   +6 more
doaj  

Rebuilding ships while at sea—Character individuality, homology, and evolutionary innovation

Journal of Morphology, Volume 284, Issue 1, January 2023., 2023
Building on a previous account of evolutionary innovation, I propose here that evolutionary novelties are those individualized characters that are not homologous to any characters in the ancestor. Integrating functional and structural perspectives, I argue that functional as well as structural considerations are important for character ...
Gerhard Schlosser
wiley   +1 more source

Multifunctional Nonlocal Metasurfaces [PDF]

Phys. Rev. Lett. 125, 017402 (2020), 2020
Diffractive photonic devices manipulate light via local and nonlocal optical modes. Local devices, such as metasurfaces, can shape a wavefront at multiple selected wavelengths, but inevitably modify light across the spectrum; nonlocal devices, such as grating filters, offer great frequency selectivity but limited spatial control.
arxiv   +1 more source

Broadband Spin-Selective Wavefront Manipulations with Generalized Pancharatnam–Berry Phase Metasurface

Photonics
Metasurfaces can flexibly manipulate electromagnetic waves by engineering subwavelength structures, which have attracted enormous attention in holography, cloaking, and functional multiplexing. For structures with n-fold (n > 2) rotational symmetry, they
Shiming Gan, Tianci Zhao, Xiuzhuang Mei, Tingting Zhang, Zhiqi Wang, Hongyu Gao, Gensen Yang, Jixiang Cai, Fuzhong Bai   +8 more
doaj   +1 more source

Controlling single-photon Fock-state propagation through opaque scattering materials [PDF]

, 2012
The control of light scattering is essential in many quantum optical experiments. Wavefront shaping is a technique used for ultimate control over wave propagation in multiple-scattering materials by adaptive manipulation of incident waves. We control the propagation of single-photon Fock states in opaque scattering materials by phase modulation of the ...
arxiv   +1 more source

Omnidirectional Transmissive Acoustic Metasurfaces Based on Goldberg Polyhedra

Advanced Functional Materials, EarlyView.
This study introduces omnidirectional acoustic metasurfaces capable of manipulating wavefronts in multiple arbitrary directions simultaneously. A full‐stack pipeline for design, optimization, and fabrication is presented to construct near‐spherical holograms based on Goldberg polyhedra.
Andrea Achilleos, James Hardwick, Ryuji Hirayama, Sriram Subramanian   +3 more
wiley   +1 more source

All‐Dielectric Multichannel Terahertz Metasurface Empowering Independent Wavefront Manipulation

Annals of Physics, 2023
Metasurfaces have demonstrated unprecedented capabilities in modulating the polarization and phase of electromagnetic waves and formed an emerging field of research, driving the exploitation of versatile compact devices.
Zhen Yue, Jitao Li, Jing Li, Chenglong Zheng, Binbin Lu, Jingyu Liu, Fan Yang, Hui Li, Yan Zhang, Yating Zhang, Xiaofei Zang, Jianquan Yao   +11 more
semanticscholar   +1 more source

Engineering wavefronts with machine learned structured polarization [PDF]

arXiv, 2022
Optical approaches for wavefront shaping traditionally rely on phase modulation through holographic techniques. Shaping the phase determines a wave's diffraction and hence its intensity distribution in space. We instead show that shaping the polarization introduces a novel framework that permits the spatial modulation of polarization to control ...
arxiv  

Enhancing Ultrasound Power Transfer: Efficiency, Acoustics, and Future Directions

Advanced Materials, EarlyView.
Implantable devices significantly enhance healthcare but are limited by battery life. Ultrasound power transfer technology offers a promising solution for sustainable operation. This review addresses gaps in current research, particularly in sound field analysis and energy efficiency optimization.
Yi Zheng, Zhuomin Zhang, Yanhu Zhang, Qiqi Pan, Xiaodong Yan, Xuemu Li, Zhengbao Yang   +6 more
wiley   +1 more source