Fig. 4: Experimental sensitivity characterization of the terahertz asynchronous twin-comb sensor.
From: Terahertz asynchronous twin-comb for prefiguring hypersensitivity beyond spectrum domain
a The measured transmission spectra and characteristic resonance frequency response with different lactose areic masses. AM areic mass. b Contour of characteristic resonance frequency corresponding to different lactose areic masses with an interval of 0.4 ng mm−2. c Linear fit of the characteristic resonance frequencies and the response of the frequency shifts in (b). Error bars indicate the standard deviation of 5 independent replicates. d Response of the terahertz Mach–Zehnder interferometer sensor to different lactose areic masses for sensing performance comparison. e Comparisons between terahertz asynchronous twin-comb sensors and existing terahertz/optical-band biochemical sensors from the two dimensions of operational frequency and experimental sensitivity. QBIC quasi-bound states in the continuum, EIT electromagnetically induced transparency, SPR surface plasmon resonance, MZI Mach–Zehnder interferometer, LPFG long-period fiber grating, TIR total internal reflection, FPI Fabry-Pérot interferometer.
