Fig. 2: Characterization of the wireless sensing system.
From: Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping
a Transmission spectrum of a packaged WGM sensor with frequency span of 450 GHz. Multiple resonance modes with different linewidths and polarizations can be obtained for sensing applications. b Transmission spectrum of a resonance mode (marked by a dashed box in (a)) with a Lorentzian fit. The quality factor is ~4.2 × 105. c Time trace of the linewidth of a resonance mode in the wireless sensing system
