Application of terahertz metamaterials for low-concentration sensing of premium explosives like RDX and TNT

Rajesh Koalla; Anil Kumar Chaudhary; Dibakar Roy Chowdhury

doi:10.1117/12.3025309

18 June 2024 Application of terahertz metamaterials for low-concentration sensing of premium explosives like RDX and TNT

Rajesh Koalla, Anil Kumar Chaudhary, Dibakar Roy Chowdhury

Author Affiliations +

Proceedings Volume 12994, Terahertz Photonics III; 129940J (2024) https://doi.org/10.1117/12.3025309
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

In the present study, we have studied the applicability of terahertz (THz) metamaterials for sensing low concentrations of premium explosives like RDX and TNT. A parallel metal-pair-based metamaterial has been investigated. The structure exhibits a Fano resonance at 0.627 THz in reflection geometry within the 0.1 to 1 THz range. The unit cell of the metamaterial comprises two asymmetric aluminium rod-like structures on an intrinsic silicon wafer with dimensions of 100 μm and 80 μm, respectively, and a silicon wafer thickness of 40 μm. The structure's periodicity is 120 μm along the x and y directions. We have also performed COMSOL-based simulations of metamaterial structures with different analyte thicknesses in conjunction with experimental verification. In the experiment, for an analyte thickness of 0.5 μm, the structure exhibits a refractive index-dependent sensitivity (S) of 5.1 GHz/RIU. For explosives, resonance peak shifts of 0.031 THz for TNT (refractive index 1.61) and 0.043 THz for RDX (refractive index 1.85) were observed from their respective resonance positions at 0.627 THz. These findings underscore the efficacy of THz metamaterials for detecting trace amounts of explosives.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Rajesh Koalla, Anil Kumar Chaudhary, and Dibakar Roy Chowdhury "Application of terahertz metamaterials for low-concentration sensing of premium explosives like RDX and TNT", Proc. SPIE 12994, Terahertz Photonics III, 129940J (18 June 2024); https://doi.org/10.1117/12.3025309

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