High-quality factor mid-wave infrared metasurface for methane detection applications

Shuhao Wu; Khue Tian Lai; Vincenzo Pusino; David R. S. Cumming

doi:10.1117/12.3030932

1 November 2024 High-quality factor mid-wave infrared metasurface for methane detection applications

Shuhao Wu, Khue Tian Lai, Vincenzo Pusino, David R. S. Cumming

Proceedings Volume 13200, Electro-Optical and Infrared Systems: Technology and Applications XXI; 132000F (2024) https://doi.org/10.1117/12.3030932
Event: Security + Defence, 2024, Edinburgh, United Kingdom

Abstract

Metasurface analogues of Electromagnetically Induced Transparency (EIT) can achieve high quality factor (Q factor) resonance transmission peaks, making them suitable for sensing applications including refractive index sensing and gas detection. We propose a displacement-driven symmetry-breaking EIT metasurface operating in the mid-wave infrared range, which consists of a tri-atom germanium nano brick array. By geometrically introducing a displacement to the central atom, an EIT transmission window can be generated. Ten EIT metasurfaces were designed with peak transmission wavelengths regularly distributed between 3.3 and 3.4 μm at intervals of 20 nm so as to target an important methane infrared absorption resonance. The transmission characteristics of the metasurfaces were studied using Rigorous Coupled-Wave Analysis (RCWA) simulations. The origin and contribution of the toroidal dipole to the EIT effect was explained through Finite-Difference Time-Domain (FDTD) simulation. Successful fabrication of precisely defined Ge nano bricks using electron beam lithography and reactive ion etching was achieved. Q-factors greater than 100 were experimentally obtained with resonant peak full-width-at-half-maxima of less than 30 nm.

Conference Presentation

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

Citation Download Citation

Shuhao Wu, Khue Tian Lai, Vincenzo Pusino, and David R. S. Cumming "High-quality factor mid-wave infrared metasurface for methane detection applications", Proc. SPIE 13200, Electro-Optical and Infrared Systems: Technology and Applications XXI, 132000F (1 November 2024); https://doi.org/10.1117/12.3030932

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