scholarly journals Perfect Absorption by an Atomically Thin Crystal

2020 ◽  
Vol 14 (2) ◽  
Author(s):  
Jason Horng ◽  
Eric W. Martin ◽  
Yu-Hsun Chou ◽  
Emmanuel Courtade ◽  
Tsu-chi Chang ◽  
...  
Keyword(s):  
Perfect Absorption ◽  
Atomically Thin Crystal ◽  
Thin Crystal

Simple fabrication method for atomically-thin crystal devices with polymer passivation

2016 ◽  
Vol 216 ◽  
pp. 98-102
Author(s):  
Yong Hyeon Kim ◽  
So Young Kim ◽  
Youngwook Kim ◽  
Jong Mok Ok ◽  
Changil Kwon ◽  
...  
Keyword(s):  
Fabrication Method ◽  
Atomically Thin Crystal ◽  
Thin Crystal

scholarly journals Wave impedance of an atomically thin crystal

2015 ◽  
Vol 23 (24) ◽  
pp. 31602 ◽  
Author(s):  
Michele Merano
Keyword(s):  
Wave Impedance ◽  
Atomically Thin Crystal ◽  
Thin Crystal

scholarly journals Publisher Correction: Bosonic condensation of exciton–polaritons in an atomically thin crystal

2021 ◽  
Author(s):  
Carlos Anton-Solanas ◽  
Maximilian Waldherr ◽  
Martin Klaas ◽  
Holger Suchomel ◽  
Tristan H. Harder ◽  
...  
Keyword(s):  
Exciton Polaritons ◽  
Atomically Thin Crystal ◽  
Thin Crystal

Observation of Bloch-Siegert Shift in an Atomically Thin Crystal

2018 ◽  
Author(s):  
Edbert J. Sie ◽  
C. H. Lui ◽  
Yi-Hsien Lee ◽  
Liang Fu ◽  
Jing Kong ◽  
...  
Keyword(s):  
Atomically Thin Crystal ◽  
Thin Crystal

Friedel'S law breakdown and interpretation of stacking fault images in tetrahedral semiconductors

1987 ◽  
Vol 45 ◽  
pp. 318-319
Author(s):  
Rob. W. Glaisher ◽  
A.E.C. Spargo
Keyword(s):  
Relative Phase ◽  
Point Group ◽  
Binary Compound ◽  
Stacking Fault ◽  
Fold Axis ◽  
Atom Pair ◽  
Tetrahedral Semiconductors ◽  
Group Symmetries ◽  
Thin Crystal ◽  
Phase Differences

Images of <11> oriented crystals with diamond structure (i.e. C,Si,Ge) are dominated by white spot contrast which, depending on thickness and defocus, can correspond to either atom-pair columns or tunnel sites. Olsen and Spence have demonstrated a method for identifying the correspondence which involves the assumed structure of a stacking fault and the preservation of point-group symmetries by correctly aligned and stigmated images. For an intrinsic stacking fault, a two-fold axis lies on a row of atoms (not tunnels) and the contrast (black/white) of the atoms is that of the {111} fringe containing the two-fold axis. The breakdown of Friedel's law renders this technique unsuitable for the related, but non-centrosymmetric binary compound sphalerite materials (e.g. GaAs, InP, CdTe). Under dynamical scattering conditions, Bijvoet related reflections (e.g. (111)/(111)) rapidly acquire relative phase differences deviating markedly from thin-crystal (kinematic) values, which alter the apparent location of the symmetry elements needed to identify the defect.

Self-Assembly Optical Components

2003 ◽  
Vol 771 ◽  
Author(s):  
Pavel I. Lazarev ◽  
Michael V. Paukshto ◽  
Elena N. Sidorenko
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Crystalline State ◽  
Liquid Crystalline ◽  
Film Deposition ◽  
X Ray Diffraction ◽  
Optical Components ◽  
Crystal Film ◽  
Solid Film ◽  
Thin Crystal

AbstractWe report a new method of Thin Crystal Film deposition. In the present paper we describe the method of crystallization, structure, and optical properties of Bisbenzimidazo[2,1-a:1',2',b']anthra[2,1,9-def:6,5,10-d'e'f']-diisoquinoline-6,9-dion (mixture with cis-isomer) (abbreviated DBI PTCA) sulfonation product. The Thin Crystal Film has a thickness of 200-1000 nm, with anisotropic optical properties such as refraction and absorption indices. X-ray diffraction data evidences a lyotropic liquid crystalline state in liquid phase and crystalline state in solid film. Anisotropic optical properties of the film make it useful in optical devices, e.g. liquid crystal displays.

scholarly journals Plasmonic hot-electron photodetection with quasi-bound states in the continuum and guided resonances

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenhao Wang ◽  
Lucas V. Besteiro ◽  
Peng Yu ◽  
Feng Lin ◽  
Alexander O. Govorov ◽  
...  
Keyword(s):  
Bound States ◽  
Structural Parameters ◽  
Hybrid Structure ◽  
Fine Tuning ◽  
Hot Electrons ◽  
Hot Electron ◽  
Perfect Absorption ◽  
High Loss ◽  
Guided Mode ◽  
The Continuum

Abstract Hot electrons generated in metallic nanostructures have shown promising perspectives for photodetection. This has prompted efforts to enhance the absorption of photons by metals. However, most strategies require fine-tuning of the geometric parameters to achieve perfect absorption, accompanied by the demanding fabrications. Here, we theoretically propose a Ag grating/TiO2 cladding hybrid structure for hot electron photodetection (HEPD) by combining quasi-bound states in the continuum (BIC) and plasmonic hot electrons. Enabled by quasi-BIC, perfect absorption can be readily achieved and it is robust against the change of several structural parameters due to the topological nature of BIC. Also, we show that the guided mode can be folded into the light cone by introducing a disturbance to become a guided resonance, which then gives rise to a narrow-band HEPD that is difficult to be achieved in the high loss gold plasmonics. Combining the quasi-BIC and the guided resonance, we also realize a multiband HEPD with near-perfect absorption. Our work suggests new routes to enhance the light-harvesting in plasmonic nanosystems.

The exceptional points of non-Hermitian optical systems: Scattering matrix definition, coherent perfect absorption, and lasing

2020 ◽  
Author(s):  
Denis V. Novitsky ◽  
Alexander S. Shalin ◽  
Andrey V. Novitsky
Keyword(s):  
Scattering Matrix ◽  
Optical Systems ◽  
Perfect Absorption ◽  
Exceptional Points ◽  
Coherent Perfect Absorption

scholarly journals Independently Tunable Multipurpose Absorber with Single Layer of Metal-Graphene Metamaterials

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 284
Author(s):  
Chen Han ◽  
Renbin Zhong ◽  
Zekun Liang ◽  
Long Yang ◽  
Zheng Fang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Fermi Level ◽  
Potential Application ◽  
Single Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Unit Cell ◽  
Perfect Absorption ◽  
Solar Energy Harvesting ◽  
Band Absorption

This paper reports an independently tunable graphene-based metamaterial absorber (GMA) designed by etching two cascaded resonators with dissimilar sizes in the unit cell. Two perfect absorption peaks were obtained at 6.94 and 10.68 μm with simple single-layer metal-graphene metamaterials; the peaks show absorption values higher than 99%. The mechanism of absorption was analyzed theoretically. The independent tunability of the metamaterial absorber (MA) was realized by varying the Fermi level of graphene under a set of resonators. Furthermore, multi-band and wide-band absorption were observed by the proposed structure upon increasing the number of resonators and resizing them in the unit cell. The obtained results demonstrate the multipurpose performance of this type of absorber and indicate its potential application in diverse applications, such as solar energy harvesting and thermal absorbing.

scholarly journals Plasmonically induced perfect absorption in graphene/metal system

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Cheng Hu ◽  
Qi Lin ◽  
Xiang Zhai ◽  
Mengting Wen ◽  
Lingling Wang
Keyword(s):  
Metal System ◽  
Perfect Absorption
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