Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/103491
Title: Broad-band polarization-insensitive all-dielectric metalens enabled by intentional off-resonance waveguiding at mid-wave infrared
Authors: Tanriover, Ibrahim
Demir, Hilmi Volkan
Keywords: DRNTU::Science::Physics
Mid-Wave Infrared
Nanomaterials
Issue Date: 2019
Source: Tanriover, I., & Demir, H. V. (2019). Broad-band polarization-insensitive all-dielectric metalens enabled by intentional off-resonance waveguiding at mid-wave infrared. Applied Physics Letters, 114(4), 043105-. doi:10.1063/1.5063967
Series/Report no.: Applied Physics Letters
Abstract: Metasurfaces are promising candidates to take the place of conventional optical components as they enable wavefront engineering at sub- and near-wavelength distances along both lateral and vertical directions. Plasmonic metasurfaces containing sub-wavelength metallic structures constitute initial examples of this concept. However, plasmonic metasurfaces cannot achieve satisfactory efficiencies in the transmission mode due to their intrinsic losses. The low efficiencies of transmissive plasmonic metasurfaces motivated solutions using dielectric ones. Such high-efficiency all dielectric metasurfaces depend on either resonance tuning or Pancharatnam–Berry (geometrical) phase approaches. However, these approaches are limited to either narrow operation bands or suffer polarization dependency. Here, we propose and show high-index dielectric nanopillars operated as cylindrical waveguides deliberately in the off-resonance regime to achieve polarization independent wavefront control over wide spectral bands. As a proof-of-concept structure, we demonstrated a focusing metalens operating at wavelengths from 4.0 to 4.6 μm under both s- and p-polarized illuminations. The designed lens maintains the focusing operation with a maximum of 4% focal distance shift having a relative efficiency of >94% and an absolute efficiency of >67% all over the defined spectral band of 600 nm, which outperforms the previously reported metalenses in terms of wide-band operation with high performance.
URI: https://hdl.handle.net/10356/103491
http://hdl.handle.net/10220/47790
ISSN: 0003-6951
DOI: 10.1063/1.5063967
Rights: © 2018 Authors. All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Authors.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

Google ScholarTM

Check

Altmetric

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.