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Nanomaterials 2019, 9(4), 603; https://doi.org/10.3390/nano9040603

Transmit-Array, Metasurface-Based Tunable Polarizer and High-Performance Biosensor in the Visible Regime

School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
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Received: 2 March 2019 / Revised: 4 April 2019 / Accepted: 4 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Nanoscale Optical Sensing)
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Abstract

There are two types of metasurfaces, reflect-array and transmit-array,—which are classified on the basis of structural features. In this paper, we design a transmit-array metasurface for y-polarized incidence which is characterized by having a transmission spectrum with a narrow dip (i.e., less than 3 nm). Furthermore, a tunable polarizer is achieved using linear geometric configurations, realizing a transmittivity ratio between x- and y-polarized incidence ranging from 0.031% to 1%. Based on the narrow-band polarization sensitivity of our polarizer, a biosensor was designed to detect an environmental refractive index ranging from 1.30 to 1.39, with a factor of sensitivity S = 192 nm/RIU and figure of merit (FOM) = 64/RIU. In the case of a narrow-band feature and dips in transmission spectrums close to zero, FOM* can have a value as large as 92,333/RIU. This unique feature makes the novel transmit-array metasurface a potential market candidate in the field of biosensors. Moreover, transmit-array metasurfaces with lossless materials offer great convenience by means of detecting either the reflectance spectrum or the transmission spectrum.
Keywords: metamaterials; metasurfaces; biosensors; polarizers; splitter; Mie resonances metamaterials; metasurfaces; biosensors; polarizers; splitter; Mie resonances
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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He, K.; Liu, Y.; Fu, Y. Transmit-Array, Metasurface-Based Tunable Polarizer and High-Performance Biosensor in the Visible Regime. Nanomaterials 2019, 9, 603.

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