| Citation: | XU Ze-kun, LI Xiang-jun, YAN De-xian. Enhancement of terahertz absorption spectrum by stacking one-dimensional photonic crystal defect cavities[J]. Chinese Optics. doi: 10.37188/CO.2025-0106
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Terahertz (THz) spectroscopy technology has demonstrated great application value in the field of organic and biological macromolecule detection. However, the traditional sample pressing method cannot be applied in the actual detection of trace analytes, and additional structures are required to enhance the interaction between the analytes and THz waves. To solve this problem, this paper proposes a terahertz absorption spectrum enhancement structure based on stacked one-dimensional photonic crystal (One-dimensional photonic crystals, 1D-PCs) defect cavities. The structure employs metal parallel-plate waveguides to separate a series of one-dimensional photonic crystals (1D-PCs) with defect cavities of varying widths, and coats the sample film on a substrate that penetrates all defect cavities. The incident broadband terahertz wave can simultaneously excite multiple resonant peaks at different frequencies corresponding to the photonic crystal defect modes in different layers. The enhanced terahertz absorption spectrum of the analyte can be obtained by linking the envelope formed by these resonant absorption peaks. The simulation results show that a 0.1 μm α-lactose sample can accomplish an absorption enhancement factor of approximately 303 times in the frequency range of 0.49 to 0.57 THz. This method offers fast measurement speed and maintains a relatively low sample amount, providing an effective strategy for the enhancement detection of trace analytes by terahertz absorption spectrum.
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