Fig. 2: Modulation on twin-comb spectra by geometry parameters.
From: Terahertz asynchronous twin-comb for prefiguring hypersensitivity beyond spectrum domain
a Schematic diagram of the relative geometry of polyethylene films. The gray and blue rectangular elements in the schematic correspond to two polyethylene films with differential transmitted lengths of lI and lII. Characteristic spectra of the designed terahertz asynchronous twin-comb sensor corresponding to b the time defect τ > 0 and c the time defect τ < 0. d Twin-comb characteristic spectrum with the time defect approaching zero. The blue and red lines represent the dual envelopes obtained by the linear fitting of the twin comb peaks, respectively, and the intersection of the dual-envelope represents the characteristic resonance frequency fcr of the twin-comb. The red-blue gradient background indicates transmission inversion of the twin-comb dual-envelope.
