Enhanced Radio-Frequency Sensors Based on a Self-Dual Emitter-Absorber

Minye Yang, Zhilu Ye, Mohamed Farhat, Pai-Yen Chen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We propose and experimentally demonstrate a parity-time-symmetric electronic system exhibiting the self-dual emitter-absorber property with a remarkable modulation depth in the radio-frequency (rf) region. The dramatically different rf responses between the emitter and absorber modes may allow detection of ultrasmall conductive or reactive perturbations. Our measurement results show that even a perturbation on the order of 10-2 can greatly change the system's output intensity by more than 30 dB, consistent with the theoretical prediction. The measured sensitivity is far beyond the sensitivity of traditional sensors based on a Fabry-Perot resonator, and may lead to monotonic rf sensors with high sensitivity and resolvability.
Original languageEnglish (US)
JournalPhysical Review Applied
Issue number1
StatePublished - Jan 14 2021


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