论文标题
用于亚微米尺寸分析物空间感测的光力晶体
Optomechanical crystals for spatial sensing of submicron sized analytes
论文作者
论文摘要
光力学晶体空腔具有丰富的观点，可用于检测和间接分析生物颗粒，例如蛋白质，细菌和病毒。在这项工作中，我们通过光学监视热激活的机械模式的频移，证明了在环境条件下作为亚微米分析物的传感器运行的光力学晶体腔的工作原理。谐振器已被专门设计，以便腔区域支持特定的低模态 - 体积机械模式的家族，通常称为-pinch模式。这些涉及仅几个相邻的腔细胞的振荡，这些腔细胞对谐振器其他部位的扰动相对不敏感。这些模式的特征频率随着变形的位置靠近谐振器的中心而降低。因此，通过识别经历频率较高的频移的特定模式，可以越过机械线宽，如果谐振器上存在颗粒，有多少粒子及其在空腔区域内的近似位置，则可以推断出。
Optomechanical crystal cavities have rich perspectives for detecting and indirectly analysing biological particles, such as proteins, bacteria and viruses. In this work we demonstrate the working principle of an optomechanical crystal cavity operating under ambient conditions as a sensor of submicrometer analytes by optically monitoring the frequency shift of thermally activated mechanical modes. The resonator has been specifically designed so that the cavity region supports a particular family of low modal-volume mechanical modes, commonly known as -pinch modes-. These involve the oscillation of only a couple of adjacent cavity cells that are relatively insensitive to perturbations in other parts of the resonator. The eigenfrequency of these modes decreases as the deformation is localized closer to the centre of the resonator. Thus, by identifying specific modes that undergo a frequency shift that amply exceeds the mechanical linewidth, it is possible to infer if there are particles deposited on the resonator, how many are there and their approximate position within the cavity region.
