Results 71 to 80 of about 7,053 (306)

Millisecond‐Switching Dual‐Band/Dual‐Polarization Ka‐Band Wavefront Control Enabled by a Complementary Liquid‐Crystal Metasurface

Advanced Materials Technologies, EarlyView.
An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim, Donggeun An, Hyunjae Shin, Youngno Youn, Wonbin Hong   +4 more
wiley   +1 more source

Silicon-on-Nitride Waveguide With Ultralow Dispersion Over an Octave-Spanning Mid-Infrared Wavelength Range

IEEE Photonics Journal, 2012
The proposed silicon-on-nitride (SON) waveguide exhibits an ultrabroadband (4200 nm), low chromatic dispersion in the mid-infrared (MIR) wavelength region from 2430 to 6630 nm. It has two zero-dispersion wavelengths within the span.
Yang Yue, Lin Zhang, Hao Huang, Raymond G. Beausoleil, Alan E. Willner   +4 more
doaj   +1 more source

Field Structures and Singularities in Subwavelength Optics

Vestnik Moskovskogo Universiteta, Seriya 3: Fizika, Astronomiya
A brief overview of the current state of the problem of electromagnetic field singularities arising from the refraction and scattering of light by material objects is given. The discussion begins with caustics arising from ray tracing in geometric optics and consistently moves toward increasing the accuracy of consideration and decreasing the scale ...
Tribelsky, M. I., Luk'yanchuk, B. S.
openaire   +2 more sources

Design and Fabrication of High Dielectric GRIN Lens for a Directive Antenna Using a Hybrid Filled Voxel Additive Manufacturing Technique

Advanced Materials Technologies, EarlyView.
Hybrid‐filled voxel AM enables integration of high‐permittivity materials into additively manufactured devices. Using this approach, a graded refractive index (GRIN) lens is demonstrated, achieving a 50% antenna size reduction with enhanced directivity.
Qianfang Zheng, Anna Radkovskaya, Kailun Xu, Ekaterina Shamonina, Patrick S. Grant   +4 more
wiley   +1 more source

Dynamically Electrically Tunable Broadband Absorber Based on Graphene Analog of Electromagnetically Induced Transparency

IEEE Photonics Journal, 2016
A broadband absorber, which is composed of graphene analog of electromagnetically induced transparency (EIT) and a metal ground plane spaced by a thin SiO 2 dielectric layer, is proposed and investigated.
Gang Yao, Furi Ling, Jin Yue, Chunya Luo, Qin Luo, Jianquan Yao   +5 more
doaj   +1 more source

Complex Band Structure for Subwavelength Evanescent Waves

Studies in Applied Mathematics
ABSTRACTWe present the mathematical and numerical theory for evanescent waves in subwavelength bandgap materials. We begin in the one‐dimensional case, whereby fully explicit formulas for the complex band structure, in terms of the capacitance matrix, are available.
Yannick De Bruijn, Erik Orvehed Hiltunen
openaire   +2 more sources

Terahertz Chiral Metamaterials Enabling Broadband Polarization Conversion Using Polarization Guiding Effect

Advanced Materials Technologies, EarlyView.
A broadband terahertz polarization rotator consisting of twistingly stacked silicon–air metagratings is designed based on the polarization guiding effect and experimentally shown to achieve 90° linear polarization rotation for both TE and TM incidences.
Yun‐Seok Choi, Tae Gwan Park, Antoinette J. Taylor, Hou‐Tong Chen, Abul K. Azad   +4 more
wiley   +1 more source

Photonic Hybrid Integration: Strategies and Promises of Advanced Additive Manufacturing

Advanced Optical Materials, EarlyView.
Heterogeneous photonic integration combines wafer bonding, transfer printing, and advanced multi‐photon lithography to realize compact, adaptable photonic systems. This review highlights breakthroughs in hybrid materials, metrology, and 4D printing, revealing how the convergence of traditional and emerging fabrication unlocks scalable, high‐performance
Zhitian Shi, Huiyu Huang, Richard Penty, Qixiang Cheng   +3 more
wiley   +1 more source

Sub‐THz Multifunctional Metasurfaces for Independent Transmission or Reflection Phase Manipulation

Advanced Optical Materials, EarlyView.
This article presents a rigorous analysis, design, and characterization of a novel sub‐THz metalens and reflective metasurface. Unlike bulky optical systems, the proposed thin, planar metasurface enables dual‐band full‐space wavefront control, via low‐loss transmission and reflection phase tuning, offering compact integration and improved ...
Bilal Ouardi, Orestis Koutsos, Olivier de Sagazan, Malo Robin, Ronan Sauleau, Antonio Clemente   +5 more
wiley   +1 more source

Responsive Visible‐Wavelength Metasurfaces from Porous Silicon Based on Fano Guided‐Mode Resonance

Advanced Optical Materials, EarlyView.
The article introduces mesoporous silicon metasurfaces (pSi‐MS) supporting Fano guided‐mode resonances in the visible regime. By combining top‐down lithographic patterning of 2D gratings with bottom‐up electrochemical porosification, the approach realizes a new class of responsive metasurfaces, enabling highly sensitive and portable platforms for small
Tomoshree Dash, Saddam Gafsi, Estevao Marques Dos Santos, Ivan Kravchenko, Judson D. Ryckman   +4 more
wiley   +1 more source