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arXiv · 1807.00221

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

Xu-Qian Zheng·Jaesung Lee·Subrina Rafique·Md Rezaul·Lu Han·Hongping Zhao·Christian A. Zorman·Philip X. -L. Feng
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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.

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Xu-Qian Zheng, Jaesung Lee, Subrina Rafique, Md Rezaul, Lu Han, Hongping Zhao, Christian A. Zorman, Philip X. -L. Feng. 2018-06-30. \beta-Ga2O3 NEMS Oscillator for Real-Time Middle Ultraviolet (MUV) Light Detection. https://doi.org/10.1109/led.2018.2850776

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