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arXiv 2202.06209physics.opticsphysics.app-ph
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具有连续束缚态的光机晶体

Optomechanical crystal with bound states in the continuum

Shengyan Liu, Hao Tong, Kejie Fang

摘要:

芯片级微纳光机系统依靠无形的辐射压力,在传感、信号转导和利用机械谐振器探索量子物理方面显示出其独特的优势。光机械晶体作为一种领先的器件平台,能够同时成型具有强光机械耦合的光学光子和微波声子的能带结构。在这里,我们展示了一个新品种的光机械晶体在二维基板上的板结构,在8 GHz的连续(BIC)的机械束缚态授权。我们发现,与低维光机械晶体相当,光机械耦合高达$g/2π\approx 2.5$ MHz的每单位细胞,由晶体诱导的BIC出现。我们的工作为探索悬浮微腔之外的光子-声子相互作用铺平了道路,这可能会导致从声子传感到量子转导的光力学新应用。

英文摘要:

Chipscale micro- and nano-optomechanical systems, hinging on the intangible radiation-pressure force, have shown their unique strength in sensing, signal transduction, and exploration of quantum physics with mechanical resonators. Optomechanical crystals, as one of the leading device platforms, enable simultaneous molding of the band structure of optical photons and microwave phonons with strong optomechanical coupling. Here, we demonstrate a new breed of optomechanical crystals in two-dimensional slab-on-substrate structures empowered by mechanical bound states in the continuum (BICs) at 8 GHz. We show symmetry-induced BIC emergence with optomechanical couplings up to $g/2π\approx 2.5$ MHz per unit cell, on par with low-dimensional optomechanical crystals. Our work paves the way towards exploration of photon-phonon interaction beyond suspended microcavities, which might lead to new applications of optomechanics from phonon sensing to quantum transduction.

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