Optical Sensing Using Hybrid Multilayer Grating Metasurfaces with Customized Spectral Response

Author:

Elshorbagy Mahmoud H.12ORCID,Cuadrado Alexander3ORCID,Alda Javier2ORCID

Affiliation:

1. Physics Department, Faculty of Science, Minia University, El-Minya 61519, Egypt

2. Grupo Complutense de Optica Aplicada, Departamento de Optica, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Av. Arcos de Jalón, 118, 28037 Madrid, Spain

3. Escuela de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Móstoles, Spain

Abstract

Customized metasurfaces allow for controlling optical responses in photonic and optoelectronic devices over a broad band. For sensing applications, the spectral response of an optical device can be narrowed to a few nanometers, which enhances its capabilities to detect environmental changes that shift the spectral transmission or reflection. These nanophotonic elements are key for the new generation of plasmonic optical sensors with custom responses and custom modes of operation. In our design, the metallic top electrode of a hydrogenated amorphous silicon thin-film solar cell is combined with a metasurface fabricated as a hybrid dielectric multilayer grating. This arrangement generates a plasmonic resonance on top of the active layer of the cell, which enhances the optoelectronic response of the system over a very narrow spectral band. Then, the solar cell becomes a sensor with a response that is highly dependent on the optical properties of the medium on top of it. The maximum sensitivity and figure of merit (FOM) are SB = 36,707 (mA/W)/RIU and ≈167 RIU−1, respectively, for the 560 nm wavelength using TE polarization. The optical response and the high sensing performance of this device make it suitable for detecting very tiny changes in gas media. This is of great importance for monitoring air quality and thecomposition of gases in closed atmospheres.

Funder

Ministerio de Economía y Competitividad

Comunidad de Madrid

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

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