Coherent detection of nonlinear nanomechanical motion using a stroboscopic downconversion technique
Coherent detection of nonlinear nanomechanical motion using a stroboscopic downconversion technique
复制标题
使用频闪下转换技术对非线性纳米机械运动进行相干检测
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Kotthaus
中科院分区：
文献类型：
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作者：
Q. Unterreithmeier;S. Manus;J. Kotthaus
提出了一种方法，该方法克服了在光纤设置转换机械运动中出现的带宽限制。分析了来自包含纳米机械谐振器的样品的反射光。以适当选择的频率调制入射激光强度，反射光的机械诱导振荡被相干下变频到检测带宽内的频率。此外，基于机械非线性响应，光信号可以定量地转换为位移，在20 μW的光功率水平下产生7 pm/Hz的灵敏度。 我们检测和图像的机械模式的基本模式在7.7 MHz的第七谐波。
A method is presented that overcomes bandwidth limitations arising in a fiber-optic setup transducing mechanical motion. The reflected light from a sample incorporating a nanomechanical resonator is analyzed. Modulating the incoming laser intensity at a suitably chosen frequency, the mechanically induced oscillation of the reflected light is coherently downconverted to a frequency within the detection bandwidth. Additionally, based on the mechanical nonlinear response, the optical signal can be quantitatively converted into displacement, yielding a sensitivity of 7 pm/Hz at optical power levels of 20 μW. We detect and image mechanical modes up to the seventh harmonic of the fundamental mode at 7.7 MHz.
影响因子：
64.8
作者：
Unterreithmeier, Quirin P.;Weig, Eva M.;Kotthaus, Joerg P.
通讯作者：
Kotthaus, Joerg P.