Results 101 to 110 of about 9,186 (292)

Chiral Metal Halide Perovskites for Spin‐Polarized Light‐Emitting Diodes

Advanced Materials, EarlyView.
Chiral metal–halide perovskites offer a route to circularly polarized light without external polarizers. This Perspective compares two spin‐light emitting diode concepts: intrinsically chiral emissive layers and chiral spin‐filter interlayers that inject spin‐polarized carriers into efficient achiral emitters.
Ashish Gaurav, Jihyun Kim, Nadesh Fiuza‐Maneiro, Hongki Kim, Hae‐Jun Seok, Sergio Gómez Grana, Robert L. Z. Hoye, Lakshminarayana Polavarapu, Matthew J. Fuchter   +8 more
wiley   +1 more source

Waveform-Dependent Absorbing Metasurfaces [PDF]

Physical Review Letters, 2013
We present the first use of a waveform-dependent absorbing metasurface for high-power pulsed surface currents. The new type of nonlinear metasurface, composed of circuit elements including diodes, is capable of storing high power pulse energy to dissipate it between pulses, while allowing propagation of small signals.
Wakatsuchi, Hiroki, Kim, Sanghoon, Rushton, Jeremiah J, Sievenpiper, Daniel F   +3 more
openaire   +6 more sources

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Recent Advances in Dielectric Chiral Metasurfaces

Advanced Physics Research
Natural chiral materials commonly possess weak chirality. Strong chirality can be achieved using chiral metasurfaces or metamaterials consisting of atom‐like subwavelength units. Chiral metasurfaces, as a surface layer of subwavelength units, have gained
Zhipeng Hu, Yuwei Sun, Hongguang Dong, Houxin Fan, Kaige Ding, Yi Jin, Sailing He   +6 more
doaj   +1 more source

Spin-Selective Transmission and Devisable Chirality in Two-Layer Metasurfaces

Scientific Reports, 2017
Chirality is a nearly ubiquitous natural phenomenon. Its minute presence in most naturally occurring materials makes it incredibly difficult to detect.
Zhancheng Li, Wenwei Liu, Hua Cheng, Shuqi Chen, Jianguo Tian   +4 more
doaj   +1 more source

A true metasurface antenna [PDF]

2016 IEEE International Symposium on Antennas and Propagation (APSURSI), 2016
AbstractWe present a true metasurface antenna based on electrically-small resonators. The resonators are placed on a flat surface and connected to one feed point using corporate feed. Unlike conventional array antennas where the distance between adjacent antennas is half wavelength to reduce mutual coupling between adjacent antennas, here the distance ...
Mohamed El Badawe, Thamer S. Almoneef, Omar M. Ramahi   +2 more
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

Liquid crystal-integrated metasurfaces for an active photonic platform

Opto-Electronic Advances
Metasurfaces have opened the door to next-generation optical devices due to their ability to dramatically modulate electromagnetic waves at will using periodically arranged nanostructures.
Dohyun Kang, Hyeonsu Heo, Younghwan Yang, Junhwa Seong, Hongyoon Kim, Joohoon Kim, Junsuk Rho   +6 more
doaj   +1 more source

Active Switching of Orbital Angular Momentum of Light Using Metasurfaces Incorporating Vanadium Dioxide. [PDF]

Nanophotonics
This work presents a novel design strategy for active metasurfaces that actively switches OAM modes. The metasurface integrates VO2 within MIM meta‐atoms. Operating at 1500 nm, the designed platform enables large leaps in topological charge. For instance, the reflected beam can be switched from a topological charge of −1 in the insulating (M1) phase to
Lyu Q, Yan Q, Fu Y, Hu X, Gong Q.
europepmc   +2 more sources

Cross‐Phase Modulation via Time‐Varying Epsilon‐Near‐Zero Metasurfaces

Advanced Optical Materials, EarlyView.
Time‐varying epsilon‐near‐zero metasurfaces are shown to enable cross‐phase modulation beyond conventional ENZ excitation. By engineering dual absorption bands and exploiting oblique ultrafast pumping, large and broadband frequency translations are achieved at low pump energies.
Rakesh Dhama, Md Imran Hossain, Jesse Pietila, Thomas Fordell, Humeyra Caglayan   +4 more
wiley   +1 more source