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Fig. 5 | PhotoniX

Fig. 5

From: Ultra-wideband terahertz fingerprint enhancement sensing and inversion model supported by single-pixel reconfigurable graphene metasurface

Fig. 5

Ultra-wideband THz fingerprint retrieval of trace disease marker GABA molecule under the synchronous voltage tuning scheme. An ultra-thin molecular coating with a thickness of 1 μm is introduced for analysis. a The complex refractive index of GABA molecule. The inset gives its molecular formula and structural features. b The first-order absorption fingerprint envelope of trace GABA molecule obtained by broadband retrieval based on graphene metasurface. The inset shows the molecular coatings deposited on the metasurface. The yellow mask is the non-applicable (N/A) area. c The second-order absorption fingerprint envelope, the natural absorption spectrum and the calculated signal enhancement factors of trace GABA molecule

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