Dinyari Khodadad N, Barbour Russell J, Golter D Andrew, Wang Hailin
Department of Physics and Oregon Center for Optics, University of Oregon, Eugene, Oregon 97403, USA.
Opt Express. 2011 Sep 12;19(19):17966-72. doi: 10.1364/OE.19.017966.
We experimentally demonstrate the mechanical tuning of whispering gallery modes in a 40 μm diameter silica microsphere at 10K, over a tuning range of 450 GHz and with a resolution less than 10 MHz. This is achieved by mechanically stretching the stems of a double-stemmed silica microsphere with a commercially available piezo-driven nano-positioner. The large tuning range is made possible by the millimeter long slip-stick motion of the nano-positioner. The ultrafine tuning resolution, corresponding to sub-picometer changes in the sphere diameter, is enabled by the use of relatively long and thin fiber stems, which reduces the effective Poisson ratio of the combined sphere-stem system to approximately 0.0005. The mechanical tuning demonstrated here removes a major obstacle for the use of ultrahigh Q-factor silica microspheres in cavity QED studies of solid state systems and, in particular, cavity QED studies of nitrogen vacancy centers in diamond.
我们通过实验证明了在10K温度下，利用市售的压电驱动纳米定位器对直径40μm的二氧化硅微球中的回音壁模式进行机械调谐，调谐范围为450GHz，分辨率小于10MHz。这是通过用纳米定位器机械拉伸双茎二氧化硅微球的茎来实现的。纳米定位器毫米级的粘滑运动使得大的调谐范围成为可能。通过使用相对长且细的光纤茎，将球 - 茎组合系统的有效泊松比降低到约0.0005，从而实现了与球直径亚皮米变化相对应的超精细调谐分辨率。这里展示的机械调谐消除了在固态系统的腔量子电动力学研究中，特别是在金刚石中氮空位中心的腔量子电动力学研究中使用超高Q因子二氧化硅微球的一个主要障碍。
