Constrained multi-objective optimization problem model to design multi-band terahertz metamaterial absorbers

The multi-band metamaterial absorbers studied today offer optimal sensing performance by maximizing the absorption at resonance frequencies. A constrained multi-objective optimization problem (CMOP) model is proposed to intelligently obtain the optimized geometrical parameters of the designed MA for...

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Bibliographic Details
Published in:Optical materials express Vol. 13; no. 3; p. 739
Main Authors: Ma, Limin, Wang, Zhenghua, Feng, Linghua, Dong, Wende, Guo, Wanlin
Format: Journal Article
Language:English
Published: Washington Optical Society of America 01.03.2023
Subjects:
Absorbers
Absorbers (materials)
Absorption
Design optimization
Figure of merit
Force reflection
Metamaterials
Multiple objective analysis
Refractivity
Resonance
Sensitivity
Terahertz frequencies
ISSN:2159-3930, 2159-3930
Online Access:Get full text
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Summary:The multi-band metamaterial absorbers studied today offer optimal sensing performance by maximizing the absorption at resonance frequencies. A constrained multi-objective optimization problem (CMOP) model is proposed to intelligently obtain the optimized geometrical parameters of the designed MA for optimal multi-band absorption. The proposed multi-band terahertz metamaterial absorber is formed by a patterned metallic patches (symmetric snowflake-shaped resonators) layer and a continuous metallic layer separated by a dielectric layer. The simulation results show that there are three discrete narrow resonance peaks with the absorption of 99.1%, 90.0%, and 99.9% in the range of 0.5–2 THz after being optimized by the proposed CMOP model. The reflection loss of all resonance modes is improved significantly compared with the conventional brute-force approach. Specifically, reflection loss at the highest resonance frequency is suppressed from -6.76 dB to -28.17 dB. Consequently, the reported MA design can be used as a refractive index sensor with the highest sensitivity of 495 GHz/RIU and the figure of merit (FoM) of 8.9 RIU −1 through a refractive index ranging from 1.0 to 1.6 at the analyte thickness of 18.5 μm. It is worth noting that most of the liquid samples have a refractive index ranging from 1.0 to 1.6. Therefore, the reported sensor can be used for liquid detection with high sensitivity.
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ISSN:2159-3930
2159-3930
DOI:10.1364/OME.478544