Figure 2
From: Rapid, high-sensitivity detection of biomolecules using dual-comb biosensing
Basic performance of single-comb RI sensing of pure water with temperature drift. (a) Schematic drawing of the experimental setup. LD laser diode; SMF single-mode fiber; WDM wavelength-division-multiplexing coupler; EDF erbium-doped fiber; MMI multimode-interference fiber sensor; OC fiber output coupler; PD photodiode. Details of the single sensing OFC are given in the Materials and Methods section. (b) Temporal drift of the cavity temperature (orange line) and the corresponding frep shift (δfrep, blue line). Pure water was used as the sample of RI sensing. δfrep was calculated as the frequency deviation from the initial value of frep. The stepped-down behavior of the cavity temperature is due to the temperature resolution of the thermistor (= 0.1 °C) used for monitoring the cavity temperature. The cavity temperature sensitivity of the single sensing OFC was approximately − 400 Hz/°C.
