Aiqun Liu

Abstracts

2 A Nanoelectromechanical Tunable Oscillator Base on a High-Q Optical Cavity

Authors: Dim-Lee Kwong, Jifang Tao, Hong Cai, Bin Dong, Aiqun Liu, Yuandong Gu, Jianguo Huang

Abstract:

We developed a miniaturized tunable optomechanical oscillator based on the nanoelectromechanical systems (NEMS) technology, and its frequencies can be electrostatically tuned by as much as 10%. By taking both advantages of optical and electrical spring, the oscillator achieves a high tuning sensitivity without resorting to mechanical tension. In particular, the proposed high-Q optical cavity design greatly enhances the system sensitivity, making it extremely sensitive to the small motional signal.

Keywords: Nanotechnology, oscillator, nanoelectromechanical systems (NEMS), optical force

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1 Refractometric Optical Sensing by Using Photonics Mach–Zehnder Interferometer

Authors: Dim-Lee Kwong, Jifang Tao, Hong Cai, Gong Zhang, Bin Dong, Aiqun Liu, Yuandong Gu

Abstract:

An on-chip refractive index sensor with high sensitivity and large measurement range is demonstrated in this paper. The sensing structures are based on Mach-Zehnder interferometer configuration, built on the SOI substrate. The wavelength sensitivity of the sensor is estimated to be 3129 nm/RIU. Meanwhile, according to the interference pattern period changes, the measured period sensitivities are 2.9 nm/RIU (TE mode) and 4.21 nm/RIU (TM mode), respectively. As such, the wavelength shift and the period shift can be used for fine index change detection and larger index change detection, respectively. Therefore, the sensor design provides an approach for large index change measurement with high sensitivity.

Keywords: Nanotechnology, Sensors, Mach-Zehnder interferometer, refractive index sensing

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