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arXiv 1003.5265physics.optics
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声子-光子晶体同时带隙平板上光机械腔和波导的设计

Design of Optomechanical Cavities and Waveguides on a Simultaneous Bandgap Phononic-Photonic Crystal Slab

Amir H. Safavi-Naeini, Oskar Painter

摘要:

在本文中,我们研究和设计准二维光机械晶体,波导,和谐振腔形成的图案板。二维周期性允许在频率中的面内伪带隙,其中禁止局部化到板的共振光学和机械激发。通过定制的晶胞几何形状,我们表明,它是可能的,有一个平板晶体同时光学和机械的伪带隙,光学波导不妥协。然后,我们使用这些晶体设计光机械腔中发生强烈的相互作用,共定位的光子-声子共振。示出了通过扰动硅光机械晶体板中的光波和声波的“线性缺陷”波导而形成的谐振腔结构,以支持波长为1.5微米的光谐振和频率为9.5GHz的机械谐振。由于波导结构的同时伪带隙,这些谐振被模拟为具有大于10^7的光学和机械辐射限制的Q因子。还研究了由于辐射压力引起的该腔中的光共振和声共振的光机械耦合,量子转换率对应于通过单个腔声子的单个腔光子的散射率,计算为292 kHz。

英文摘要:

In this paper we study and design quasi-2D optomechanical crystals, waveguides, and resonant cavities formed from patterned slabs. Two-dimensional periodicity allows for in-plane pseudo-bandgaps in frequency where resonant optical and mechanical excitations localized to the slab are forbidden. By tailoring the unit cell geometry, we show that it is possible to have a slab crystal with simultaneous optical and mechanical pseudo-bandgaps, and for which optical waveguiding is not compromised. We then use these crystals to design optomechanical cavities in which strongly interacting, co-localized photonic-phononic resonances occur. A resonant cavity structure formed by perturbing a "linear defect" waveguide of optical and acoustic waves in a silicon optomechanical crystal slab is shown to support an optical resonance at wavelength 1.5 micron and a mechanical resonance of frequency 9.5 GHz. These resonances, due to the simultaneous pseudo-bandgap of the waveguide structure, are simulated to have optical and mechanical radiation-limited Q-factors greater than 10^7. The optomechanical coupling of the optical and acoustic resonances in this cavity due to radiation pressure is also studied, with a quantum conversion rate, corresponding to the scattering rate of a single cavity photon via a single cavity phonon, calculated to be 292 kHz.

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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