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arXiv 1902.00614physics.opticscond-mat.mes-hall
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宏观光学力学中连续介质中的力学束缚态

Mechanical bound states in the continuum for macroscopic optomechanics

Mengdi Zhao, Kejie Fang

摘要:

连续束缚态是一种不同于腔基共振的长寿命共振态,在光子晶体和声表面波等经典系统中得到了广泛的研究。在这里,我们揭示了在基板上的光机械晶体的结构中的受保护的机械BIC。利用群论方法,以$C_{4v}$和$C_{6v}$对称性为例,确定了光机械晶体中所有位于$Γ$点的机械BIC,并分析了它们与共定域光学BIC的耦合以及由于动边界和光弹效应引起的导共振.我们验证了理论分析与数值模拟特定的光学机械晶体,支持大量的光学机械之间的相互作用的机械BIC和光学谐振。由于高$Q$、大尺寸机械BIC和衬底使能的热耗散的独特特征,这种衬底上板光机械晶体的架构可能有助于探索宏观量子力学物理和实现新的应用,例如高通量传感和自由空间光束转向。

英文摘要:

Bound states in the continuum (BICs), an emerging type of long-lived resonances different from the cavity-based ones, have been explored in several classical systems, including photonic crystals and surface acoustic waves. Here, we reveal symmetry-protected mechanical BICs in the structure of slab-on-substrate optomechanical crystals. Using a group theory approach, we identified all the mechanical BICs at the $Γ$ point in optomechanical crystals with $C_{4v}$ and $C_{6v}$ symmetries as examples, and analyzed their coupling with the co-localized optical BICs and guided resonances due to both moving boundary and photo-elastic effects. We verified the theoretical analysis with numerical simulations of specific optomechanical crystals which support substantial optomechanical interactions between the mechanical BICs and optical resonances. Due to the unique features of high-$Q$, large-size mechanical BICs and substrate-enabled thermal dissipation, this architecture of slab-on-substrate optomechanical crystals might be useful for exploring macroscopic quantum mechanical physics and enabling new applications such as high-throughput sensing and free-space beam steering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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