\beta-Ga2O3 NEMS Oscillator for Real-Time Middle Ultraviolet (MUV) Light Detection

TL;DR

This paper introduces the first eta-Ga2O3 NEMS oscillator that uses a nanoresonator as a frequency reference for real-time middle ultraviolet light detection, demonstrating high sensitivity and potential for MUV sensing applications.

Contribution

It presents the development of a eta-Ga2O3-based NEMS oscillator with optical-electrical feedback for real-time MUV detection, a novel application of eta-Ga2O3 nanodevices.

Findings

Resonance at ~30 MHz in eta-Ga2O3 nanodevices

Resonant frequency downshift under MUV irradiation

Responsivity of -3.1 Hz/pW and detection limit of 0.53 nW

Abstract

We report on the first beta gallium oxide (\beta-Ga2O3) crystal feedback oscillator built by employing a vibrating \beta-Ga2O3 nanoresonator as the frequency reference for real-time middle ultraviolet (MUV) light detection. We fabricate suspended \beta-Ga2O3 nanodevices through synthesis of \beta-Ga2O3 nanoflakes using low-pressure chemical vapor deposition (LPCVD), and dry transfer of nanoflakes on microtrenches. Open-loop tests reveal a resonance of the \beta-Ga2O3 device at ~30 MHz. A closed-loop oscillator is then realized by using a combined optical-electrical feedback circuitry, to perform real-time resonant sensing of MUV irradiation. The oscillator exposed to cyclic MUV irradiation exhibits resonant frequency downshifts, with a measured responsivity of $\mathscr{R}$ = -3.1 Hz/pW and a minimum detectable power of \delta Pmin = 0.53 nW for MUV detection.