Multi-Band Terahertz Metamaterial Absorber Integrated with Microfluidics and Its Potential Application in Volatile Organic Compound Sensing

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Abstract
In this study, a terahertz microfluidic multi-band sensor was designed. Unlike previous microfluidic absorption sensors that rely on dipole resonance, the proposed sensor uses a physical mechanism for absorption by exciting higher-order lattice resonances in microfluidic structures. With a Fabry–Perot cavity, the sensor can form an absorption peak with a high quality factor (Q) and narrow full width at half maximum (FWHM). A high Q value and a narrow FWHM are valuable in the field of sensing and provide strong support for high-precision sensing. On this basis, the sensing performance of the device was investigated. The simulation results clearly show that the absorption sensor has ultra-high sensitivity, which reaches 400 GHz/Refractive Index Unit (RIU). In addition, the sensor generates three absorption peaks, overcoming the limitations of a single frequency band in a composite resonance mode and multidimensional frequency response, which has potential application value in the field of volatile organic compound (VOC) sensing.
Funding Information
  • the Yangtze River Delta Innovation and Entrepreneurship Joint Carrier Demonstration Project (23002430100, K20241036, 61903159, BK20190617)
  • the Wuxi science and technology development fund project (23002430100, K20241036, 61903159, BK20190617)
  • The National Natural Science Foundation of China (23002430100, K20241036, 61903159, BK20190617)
  • The Natural Science Foundation of Jiangsu Province (23002430100, K20241036, 61903159, BK20190617)

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