Center for Nanophotonics, FOM Institute AMOLF , Science Park 104, 1098XG Amsterdam, The Netherlands.
Nano Lett. 2013 Jul 10;13(7):3293-7. doi: 10.1021/nl4015028. Epub 2013 Jun 11.
We demonstrate plasmon-mechanical coupling in a metalized nanomechanical oscillator. A coupled surface plasmon is excited in the 25 nm wide gap between two metalized silicon nitride beams. The strong plasmonic dispersion allows the nanomechanical beams' thermal motion at a frequency of 4.4 MHz to be efficiently transduced to the optical transmission, with a measured displacement spectral density of 1.11 × 10(-13) m/Hz(1/2). When exciting the second-order plasmonic mode at λ = 780 nm we observe optical-power-induced frequency shifts of the mechanical oscillator. Our results show that novel functionality of plasmonic nanostructures can be achieved through coupling to engineered nanoscale mechanical oscillators.
我们在金属化纳米机械振荡器中演示了等离子体-机械耦合。在两个金属化氮化硅梁之间的 25nm 宽间隙中激发出耦合的表面等离子体。强烈的等离子体色散允许纳米机械梁以 4.4MHz 的频率进行热运动，有效地转化为光传输，测量得到的位移谱密度为 1.11×10(-13) m/Hz(1/2)。当在 λ = 780nm 处激励二阶等离子体模式时，我们观察到机械振荡器的光功率诱导频率移动。我们的结果表明，通过与工程纳米级机械振荡器耦合，可以实现等离子体纳米结构的新功能。
