Tunable Split-Disk Metamaterial Absorber for Sensing Application

We present four designs of tunable split-disk metamaterial (SDM) absorbers. They consist of a bottom gold (Au) mirror layer anchored on Si substrate and a suspended-top SDM nanostructure with one, two, three, and four splits named SDM-1, SDM-2, SDM-3, and SDM-4, respectively. By tailoring the geomet...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-02, Vol.11 (3), p.598
Main Authors: Zhang, Yusheng, Lin, Peng, Lin, Yu-Sheng
Format: Article
Language:English
Subjects:
Absorbers
Absorbers (materials)
Absorption
Absorption spectra
Biosensors
Boundary conditions
Correlation coefficient
Correlation coefficients
Gas sensors
Gases
metal-insulator-metal absorber
Metamaterials
plasmonic sensor
Refractivity
Residual stress
Sensitivity
Sensors
Silicon substrates
tunable metamaterial
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Summary:We present four designs of tunable split-disk metamaterial (SDM) absorbers. They consist of a bottom gold (Au) mirror layer anchored on Si substrate and a suspended-top SDM nanostructure with one, two, three, and four splits named SDM-1, SDM-2, SDM-3, and SDM-4, respectively. By tailoring the geometrical configurations, the four SDMs exhibit different tunable absorption resonances spanning from 1.5 µm to 5.0 µm wavelength range. The resonances of absorption spectra can be tuned in the range of 320 nm, and the absorption intensities become lower by increasing the gaps of the air insulator layer. To increase the sensitivity of the proposed devices, SDMs exhibit high sensitivities of 3312 nm/RIU (refractive index unit, RIU), 3362 nm/RIU, 3342 nm/RIU, and 3567 nm/RIU for SDM-1, SDM-2, SDM-3, and SDM-4, respectively. The highest correlation coefficient is 0.99999. This study paves the way to the possibility of optical gas sensors and biosensors with high sensitivity.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11030598