Diamond-shaped hole array as a fishnet metamaterial for negative refraction

2013 ◽  
Author(s):  
C. Sabah ◽  
A. Yilmaz
Keyword(s):  
Negative Refraction ◽  
Hole Array ◽  
Shaped Hole

scholarly journals Gourd-shaped hole array germanium (Ge)-on-insulator photodiodes with specific detectivity superior to that of bulk Ge photodiodes

2021 ◽  
Author(s):  
Bongkwon Son ◽  
Hao Zhou ◽  
Yiding Lin ◽  
Kwang Hong Lee ◽  
Chuan Seng Tan
Keyword(s):  
Hole Array ◽  
Shaped Hole ◽  
Specific Detectivity

scholarly journals Photonic bands, superchirality, and inverse design of a chiral minimal metasurface

Nanophotonics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 2291-2301 ◽  
Author(s):  
Simone Zanotto ◽  
Giacomo Mazzamuto ◽  
Francesco Riboli ◽  
Giorgio Biasiol ◽  
Giuseppe C. La Rocca ◽  
...  
Keyword(s):  
Singular Value ◽  
Inverse Design ◽  
Hole Array ◽  
Dielectric Slab ◽  
Design Technique ◽  
Cell Geometry ◽  
Chiral Structures ◽  
Shaped Hole ◽  
Value Decomposition ◽  
Photonic Band

AbstractPhotonic band structures are a typical fingerprint of periodic optical structures, and are usually observed in spectroscopic quantities such as transmission, reflection, and absorption. Here we show that the chiro-optical response of a metasurface constituted by a lattice of non-centrosymmetric, L-shaped holes in a dielectric slab shows a band structure, where intrinsic and extrinsic chirality effects are clearly recognized and connected to localized and delocalized resonances. Superchiral near-fields can be excited in correspondence to these resonances, and anomalous behaviors as a function of the incidence polarization occur. Moreover, we have introduced a singular value decomposition (SVD) approach to show that the above mentioned effects are connected to specific fingerprints of the SVD spectra. Finally, by means of an inverse design technique we have demonstrated that the metasurface based on an L-shaped hole array is a minimal one. Indeed, its unit cell geometry depends on the smallest number of parameters needed to implement arbitrary transmission matrices compliant with the general symmetries for 2d-chiral structures. These observations enable more powerful wave operations in a lossless photonic environment.

Broadband mid-IR antireflective Reuleaux-triangle-shaped hole array on germanium

2019 ◽  
Vol 17 (12) ◽  
pp. 122401 ◽  
Author(s):  
Haijuan Cheng ◽  
Miao Dong ◽  
Qinwen Tan ◽  
Linghai Meng ◽  
Yi Cai ◽  
...  
Keyword(s):  
Hole Array ◽  
Reuleaux Triangle ◽  
Shaped Hole

Towards focusing using photonic crystal flat lens

2006 ◽  
Vol 14 (3) ◽  
Author(s):  
N. Fabre ◽  
S. Fasquel ◽  
C. Legrand ◽  
X. Mélique ◽  
M. Muller ◽  
...  
Keyword(s):  
Indium Phosphide ◽  
Negative Refraction ◽  
Negative Refractive Index ◽  
Semiconductor Layer ◽  
Hole Array ◽  
Deep Reactive Ion Etching ◽  
Second Stage ◽  
Main Emphasis ◽  
Key Issues ◽  
Flat Lens

AbstractWe report on the numerical simulation and fabrication of a two-dimensional flat lens based on negative refraction in photonic crystals. The slab acting as a lens is made of an hole array (operating at the wavelength of 1.5 μm) etched in a InP/InGaAsP/InP semiconductor layer. We first study the key issues for the achievement of a negative refractive index taking advantage of folding of dispersion branches with main emphasis in dispersion properties rather than the opening of forbidden gaps. The diffraction and refraction regimes are analysed according to the comparison of the wave-vector with respect to the relevant dimensions of the hole array. In the second stage, we illustrate technological challenges in terms of e-beam lithography on a sub-micron scale and deep reactive ion etching for an indium phosphide based technology.

Filling the Bank-Shaped Hole

CFA Digest ◽  
2013 ◽  
Vol 43 (1) ◽  
pp. 14-15
Author(s):  
Nitin Joshi
Keyword(s):  
Shaped Hole

Discussion on Negative Refraction and Perfect Lens

PIERS Online ◽  
2005 ◽  
Vol 1 (1) ◽  
pp. 34-36 ◽  
Author(s):  
Long Gen Zheng ◽  
Wenxun Zhang
Keyword(s):  
Negative Refraction ◽  
Perfect Lens
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