1-D Metal-Dielectric-Metal Grating Structure as an Ultra-Narrowband Perfect Plasmonic Absorber in the Visible and Its Ap
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1-D Metal-Dielectric-Metal Grating Structure as an Ultra-Narrowband Perfect Plasmonic Absorber in the Visible and Its Application in Glucose Detection Sandeep Kumar Chamoli 1,2,3 & Subhash C. Singh 1,2,3 & Chunlei Guo 1,2,3 Received: 26 December 2019 / Accepted: 22 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The need for an easy to fabricate perfect and narrowband light absorber in the visible range of electromagnetic (EM) spectrum has always been in demand for many scientific and device applications. Here, we propose a metal-dielectric-metal (MDM) 1-D grating plasmonic structure as a perfect narrow band light absorber in the visible and its application in glucose detection. The proposed structure consists of a 1- D grating of gold on the top of a dielectric layer on a gold film. Optimization for dielectric grating index (n), grating thickness (t), grating width (W), and grating period (P) has been done to improve the performance of plasmonic structure by calculating its quality factor and figure-of-merit (FOM). The optimized plasmonic structure behaves as a perfect narrowband light absorber. The flexibility to work at a specific wavelength is also offered by the proposed structure through an appropriate selection of the geometrical parameters and refractive index of the dielectric grating. The equivalent RC model is used to understand different components of the proposed structure on the optical response. The absorption response of the structure is invariant to the incident angle. Moreover, the calculated absorbance of the proposed plasmonic structure is ~ 100% with a narrow full-width half maxima (FWHM) of ~ 2.8 nm. We have numerically demonstrated a potential application of the proposed MDM absorber as a plasmonic glucose sensor in the visible range with detection sensitivity in the range of 140 to 195 nm/RIU. Keywords Optical sensors . Plasmons . Optical detectors . Glucose detection . Metal-dielectric-metal . LC equivalent circuit
Introduction Recently, plasmonic metamaterials have attracted significant research interest due to their ability to control, alter, and magnify properties of incident electromagnetic radiation. These surfaces have promising applications in confining light in
* Subhash C. Singh [email protected] * Chunlei Guo [email protected] 1
The Guo China-US Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, University of Chinese Academy of Science, Changchun 130033, China
2
University of Chinese Academy of Science, Beijing 100039, China
3
The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
sub-wavelength dimensions [1–3], in enhanced light transmission [4, 5], in optical couplers and waveguides [6], in optical sensing [1, 6], and so on. Moreover, plasmonic metamaterials have been recently used in photonic modulators [7–9], photodetectors [10, 11], thermal imaging [12], microbolometers [13], and so on. It has
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