Browsing by Author "Fang, Junbin"
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Item Accurate measurement of nanomechanical motion in a fiber-taper nano-optomechanical system(AIP Publishing LLC, 2019) Zheng, Huadan; Qiu, Weiqia; Gu, Xiaohang; Zhang, Yu; Zhu, Wenguo; Huang, Bincheng; Lu, Huihui; Guan, Heyuan; Xiao, Yi; Zhong, Yongchun; Fang, Junbin; Luo, Yunhan; Zhang, Jun; Yu, Jianhui; Tittel, Frank; Chen, ZheThe hybrid systems that couple optical and mechanical degrees of freedom in nanoscale devices offer an unprecedented opportunity and development in laboratories worldwide. A nano-optomechanical (NOM) system that converts energy directly/inversely between optics and mechanics opens an approach to control the behavior of light and light-driven mechanics. An accurate measurement of the mechanical motion of a fiber-taper NOM system is a critical challenge. In this work, an optical microscope was used to measure the nanoscale mechanical motion of the fiber taper by introducing white light interference. The resolution of mechanical motion monitoring achieved 0.356 nm with an optomechanical efficiency of >20 nm/μW. This paper describes an approach to characterize NOM transducers between optical and mechanical signals in both classical and quantum fields.Item Quartz-enhanced photoacoustic spectroscopy exploiting a fast and wideband electro-mechanical light modulator(Optical Society of America, 2020) Zheng, Huadan; Zheng, Huadan; Liu, Yihua; Lin, Haoyang; Kan, Ruifeng; Kan, Ruifeng; Dong, Lei; Dong, Lei; Zhu, Wenguo; Fang, Junbin; Yu, Jianhui; Yu, Jianhui; Tittel, Frank K.; Chen, ZheA quartz-enhanced photoacoustic spectroscopy (QEPAS) gas sensor exploiting a fast and wideband electro-mechanical light modulator was developed. The modulator was designed based on the electro-mechanical effect of a commercial quartz tuning fork (QTF). The laser beam was directed on the edge surface of the QTF prongs. The configuration of the laser beam and the QTF was optimized in detail in order to achieve a modulation efficiency of ∼100%. The L-band single wavelength laser diode and a C-band tunable continuous wave laser were used to verify the performance of the developed QTF modulator, respectively, realizing a QEPAS sensor based on amplitude modulation (AM). As proof of concept, the AM-based QEPAS sensor demonstrated a detection limit of 45 ppm for H2O and 50 ppm for CO2 with a 1 s integration time respectively.