Optomechanical thermal effect of nanofilm by time-correlated single-photon counting

Abstract

Optomechanical sensing enables non-contact measurement of vibrational noise in nanofilms. While the quantitative thermal response of nanofilms is not fully understood, we investigated the temperature-dependent vibrational frequency of a silicon nitride nanofilm window, focusing on the analysis of its noise spectrum. To achieve high sensitivity and minimize input noise, we employed a time-correlated single-photon counting technique, extracting the noise spectrum through the Fourier transform of photon arrival times. Additionally, a vibration model was developed to illustrate the temperature dependence of the nanofilm's frequency. Based on these findings, we propose the use of nanofilms as sensitive, non-contact temperature sensors, with potential for applications in cryogenic environments.