Ultrafast Detection of TeraHertz Radiation with Miniaturized Optomechanical Resonator Driven by Dielectric Driving Force

We report on an optomechanical terahertz (THz) meta-atom detector empowered by a dielectric driving force scheme. The meta-atom consists of a suspended half-wavelength THz antenna that sustains high quality factor mechanical modes. The THz radiation is resonantly absorbed by the meta-atom and enforc...

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Bibliographic Details
Published inACS photonics Vol. 9; no. 5; pp. 1541 - 1546
Main Authors Liu, Jiawen, Chomet, Baptiste, Beoletto, Paolo, Gacemi, Djamal, Pantzas, Konstantinos, Beaudoin, Grégoire, Sagnes, Isabelle, Vasanelli, Angela, Sirtori, Carlo, Todorov, Yanko
Format Journal Article
LanguageEnglish
Published American Chemical Society 18.05.2022
Subjects
Engineering Sciences
gradient force
phase-lock loop
terahertz detection
terahertz resonator
optomechanics
Duffing nonlinearity
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Summary:We report on an optomechanical terahertz (THz) meta-atom detector empowered by a dielectric driving force scheme. The meta-atom consists of a suspended half-wavelength THz antenna that sustains high quality factor mechanical modes. The THz radiation is resonantly absorbed by the meta-atom and enforces an optimized photothermal mechanism that produces mechanical oscillations, with a responsivity of 30 pm·nW–1/3 Hz·nW–1 in terms of amplitude/frequency response. Moreover, in this optomechanical system, THz-induced Duffing nonlinearities can be easily observed. The dielectric driving forces allow the implementation of a frequency phase-lock loop, with a harmonic bandwidth on the order of 1 MHz, and thus, square wave THz signals can be temporally recovered at frequencies up to 100 kHz.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.2c00227