Low-Power Photothermal Self-Oscillation of Bimetallic Nanowires
Low-Power Photothermal Self-Oscillation of Bimetallic Nanowires
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DOI：
10.1021/acs.nanolett.6b04769
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发表时间：
2017-07-01
期刊：
影响因子：
10.8
通讯作者：
Parpia, Jeevak M.
中科院分区：
文献类型：
--
作者：
De Alba, Roberto;Abhilash, T. S.;Parpia, Jeevak M.
本文研究了SiN-Nb纳米线在入射激光和Si反射镜作用下的非线性光学吸收机制。位于光强度的驻波中并受到光热力的影响，纳米线在无穷大的低入射光阈值下经历自诱导振荡，而不是先前报道的ω（0）τ = 1。最后，我们证明光热品质因数（Q）增强驱动运动作为一种手段，以抵消空气阻尼。了解光热效应对纳米和微机械器件的影响，以及基于光学的运动检测的非线性方面，可以：实现新的器件应用，如振荡器或其他电子元件，器件尺寸更小，环境真空要求不那么严格。
We investigate the nonlinear mechanics of a bimetallic, optically absorbing SiN-Nb nanowire in the presence of incident laser light and a reflecting Si mirror. Situated in a standing wave of optical intensity and subject to photothermal forces, the nanowire undergoes self-induced oscillations at low incident light thresholds of infinity rather than the previously reported omega(0) tau = 1. Lastly, we demonstrate photothermal quality factor (Q) enhancement of driven motion as a means to counteract air damping. Understanding photothermal effects on nano- and micromechanical devices, as well as nonlinear aspects of optics-based motion detection) can:enable new device applications as oscillators or other-electronic elements with smaller device footprints and less stringent ambient vacuum requirements.