Dual THz combs enable high-sensitivity RI sensing by amplifying frequency shifts to hundreds of kHz and suppressing temperature effects through common-mode rejection, yielding 5.05 × 10^7 Hz/RIU sensitivity and 1.07 × 10^{-4} RIU resolution.
Refractive-index measurements in the near-IR using an Abbe refractometer
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Dual terahertz frequency combs for photonic RF readout of refractive index sensing with frequency multiplication and active-dummy temperature compensation
Dual THz combs enable high-sensitivity RI sensing by amplifying frequency shifts to hundreds of kHz and suppressing temperature effects through common-mode rejection, yielding 5.05 × 10^7 Hz/RIU sensitivity and 1.07 × 10^{-4} RIU resolution.