High Frequency GaAs Nano-Optomechanical Disk Resonator
High Frequency GaAs Nano-Optomechanical Disk Resonator
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DOI：
10.1103/physrevlett.105.263903
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发表时间：
2010-12-23
影响因子：
8.6
通讯作者：
Favero, Ivan
中科院分区：
文献类型：
--
作者：
Ding, Lu;Baker, Christophe;Favero, Ivan
当耦合发生在减小的体积中时，机械振荡器与被困在腔中的光之间的光-机耦合会增加。在这里，我们展示了一个GaAs半导体光机械磁盘系统，其中光能和机械能都可以被限制在亚波长尺度的相互作用体积中。我们观察到一个巨大的光-力耦合速率高达100 GHz/nm，涉及频率在100 MHz至1 GHz之间的picogram质量机械模式。机械模式被挑选出来，测量它们的色散作为圆盘几何的函数。它们的布朗运动在室温和常压下的光学分辨灵敏度为10(-17)m/根Hz，接近量子极限不精确。
Optomechanical coupling between a mechanical oscillator and light trapped in a cavity increases when the coupling takes place in a reduced volume. Here we demonstrate a GaAs semiconductor optomechanical disk system where both optical and mechanical energy can be confined in a subwavelength scale interaction volume. We observe a giant optomechanical coupling rate up to 100 GHz/nm involving picogram mass mechanical modes with a frequency between 100 MHz and 1 GHz. The mechanical modes are singled-out measuring their dispersion as a function of disk geometry. Their Brownian motion is optically resolved with a sensitivity of 10(-17) m/root Hz at room temperature and pressure, approaching the quantum limit imprecision.