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- Title
Enhancement of the terahertz absorption spectroscopy based on the stretchable dielectric metasurface.
- Authors
Li, Xiangjun; Wu, Hang; Yan, Dexian; Zhang, Le; Zhao, Yang
- Abstract
Though the terahertz fingerprint spectroscopy enables the fast and unique detection and identification of organic or bio-molecules, it remains a challenge to acquire broad terahertz absorption spectra of trace-mount samples. In this paper, a strategy is proposed to boost terahertz absorption spectroscopy of organic film on a stretchable metasurface. The metasurface substrate and unit cell structures are constructed using polydimethylsiloxane (PDMS) material. The resonance peak frequency of the metasurface absorption corresponding to different stretching factors can cover the frequency range of 0.48–0.58 THz. When the metasurface surface is covered with a 0.2 μm thickness α-lactose film, the envelop absorption formed by the peak values of the metasurface absorption spectrum, with stretching factors ranging from 100% to 124%, can significantly enhance the absorption of the same thickness film by over 101 times. The investigation results demonstrate that the stretchable metasurface can obviously strengthen the terahertz absorption of the tiny sample. By optimizing the unit cell design of the metasurface, it may be possible to identify other small volume organic compounds with diverse characteristic peaks.
- Subjects
TERAHERTZ spectroscopy; ABSORPTION spectra; UNIT cell; DIELECTRICS; CELL anatomy; ORGANIC compounds
- Publication
Applied Physics A: Materials Science & Processing, 2024, Vol 130, Issue 1, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-023-07205-9