Journal
PLASMONICS
Volume 15, Issue 5, Pages 1339-1350Publisher
SPRINGER
DOI: 10.1007/s11468-020-01161-3
Keywords
Optical sensors; Plasmons; Optical detectors; Glucose detection; Metal-dielectric-metal; LC equivalent circuit
Funding
- National Key RAMP
- D Program of China [2017YFB1104700]
- National Natural Science Foundation of China [11674178]
- Jilin Provincial Science AMP
- Technology Development Project [20180414019GH]
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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 similar to 100% with a narrow full-width half maxima (FWHM) of similar to 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.
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