Infrared thermal source or perfect absorber sensor based on silver 2D grating

We design and numerically investigate the spectral properties of two kinds of 2D Ag structured surfaces. The first structure is composed of Ag achieving a maximum absorption of 90% with the optimal structured parameters. The insertion of a metal layer between the grating layer and the substrate impr...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2020-09, Vol.126 (9), Article 675
Main Authors: Sassi, Imed, Mghaieth, Ridha
Format: Article
Language:English
Subjects:
Absorbers
Absorption
Applied physics
Biosensors
Characterization and Evaluation of Materials
Condensed Matter Physics
Directivity
Figure of merit
Infrared detectors
Machines
Manufacturing
Materials science
Nanotechnology
Numerical analysis
Optical and Electronic Materials
Parameters
Physics
Physics and Astronomy
Processes
Q factors
Refractivity
Sensors
Silver
Substrates
Surfaces and Interfaces
Thin Films
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Summary:We design and numerically investigate the spectral properties of two kinds of 2D Ag structured surfaces. The first structure is composed of Ag achieving a maximum absorption of 90% with the optimal structured parameters. The insertion of a metal layer between the grating layer and the substrate improved not only the absorption (greater than 95%) but also the sensor performance. Numerical computation is conducted to obtain the spectral distribution of powers with different structural parameters using the rigorous coupled-wave analysis method. Thus, we have demonstrated that any considered silver structure behaves either as a thermal source or a plasmonic sensor in the infrared range. The degree of directivity of each thermal source studied depends on several geometric and optical parameters. The best directivity is characterized by a narrow band of the full width at half maximum equal to 10.46 mrad with a nearly perfect absorption. Then, the performance of this source is identified by a quality factor ( Q ) equal to 176.52. The proposed structure as a perfect absorber sensor gives a maximum sensitivity of 4000 nm/RIU , a maximum absorption of 100 % (demonstrated by strong fields distribution), and a maximum value of figure of merit equal to 52.71 RIU - 1 for analyte refractive index ranging from 1.33 to 1.4. The proposed structures have great potential as biosensors.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-020-03854-2