Optomechanical coupling in phoxonic–plasmonic slab cavities with periodic metal strips
Optomechanical coupling in phoxonic–plasmonic slab cavities with periodic metal strips
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DOI：
10.1063/1.4919754
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发表时间：
2015-05
影响因子：
3.2
通讯作者：
Tzy-Rong Lin;Yin‐Chen Huang;J. Hsu
中科院分区：
文献类型：
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作者：
Tzy-Rong Lin;Yin‐Chen Huang;J. Hsu
本文从理论上研究了一维光子-等离子体平板中形成的亚微米腔的光机械耦合。通过将周期性Ag条沉积到电介质GaAs板的顶表面上以产生用于电磁波和声波两者的双带隙，从而诱导表面等离子体激元与光子的耦合以定制OM耦合，来构造光子-等离子体激元板。我们量化的OM耦合通过计算的时间调制的光共振波长与声学声子诱导的光弹（PE）和移动边界（MB）的影响。我们还考虑了均匀的银层的板的底部表面上的外观调制的光子等离子体激元耦合。结果表明，PE和MB效应可以是建设性的或破坏性的整体OM耦合，其大小不仅取决于谐振模式的品质因数，但也对模式面积，模式重叠，和个人的对称性的光子-声子模式对。降低模面积可以有效地增强亚波长光子和声子的OM耦合。这项研究介绍了可能的工程应用，以实现增强纳米OM器件中光子和声子之间的相互作用。
We theoretically investigate the optomechanical (OM) coupling of submicron cavities formed in one-dimensional phoxonic–plasmonic slabs. The phoxonic–plasmonic slabs are structured by depositing periodic Ag strips onto the top surfaces of dielectric GaAs slabs to produce dual band gaps for both electromagnetic and acoustic waves, thereby inducing the coupling of surface plasmons with photons for tailoring the OM coupling. We quantify the OM coupling by calculating the temporal modulation of the optical resonance wavelength with the acoustic phonon-induced photoelastic (PE) and moving-boundary (MB) effects. We also consider the appearance of a uniform Ag layer on the bottom surface of the slabs to modulate the photonic–plasmonic coupling. The results show that the PE and MB effects can be constructive or destructive in the overall OM coupling, and their magnitudes depend not only on the quality factors of the resonant modes but also on the mode area, mode overlap, and individual symmetries of the photonic–phononic mode pairs. Lowering the mode area could be effective for enhancing the OM coupling of subwavelength photons and phonons. This study introduces possible engineering applications to achieve enhanced interaction between photons and phonons in nanoscale OM devices.