论文标题
具有深度次波长限制的介电弓形腔的模态特性
Modal properties of dielectric bowtie cavities with deep sub-wavelength confinement
论文作者
论文摘要
我们为光学介电弓形腔提供了一种设计，该腔具有深度的次级波长限制。通过简化通过拓扑优化的反设计识别的复杂几何形状来得出腔，并成功保留了原始结构的极端特性，包括$ v_ \ text {eff} = 0.083 \ pm 0.001 \; （λ_\ text {c}/2n_ \ text {si}）^3 $在其中心。基于此设计，我们提出了模态分析，以表明percell因子可以通过单个准模式在广泛的带宽中得到很好的描述。此外，由于较小的模式体积，腔体对局部形状变形表现出显着的敏感性，我们证明这是通过扰动理论很好地描述的。反向设计几何形状的直观简化方法以及本工作中证明的准模式分析为具有深层次波长限制的介电腔的新兴场提供了强大的建模框架。
We present a design for an optical dielectric bowtie cavity which features deep sub-wavelength confinement of light. The cavity is derived via simplification of a complex geometry identified through inverse design by topology optimization, and it successfully retains the extreme properties of the original structure, including an effective mode volume of $V_\text{eff}= 0.083 \pm 0.001 \; (λ_\text{c}/2n_\text{Si})^3$ at its center. Based on this design, we present a modal analysis to show that the Purcell factor can be well described by a single quasinormal mode in a wide bandwidth of interest. Owing to the small mode volume, moreover, the cavity exhibits a remarkable sensitivity to local shape deformations, which we show to be well described by perturbation theory. The intuitive simplification approach to inverse design geometries coupled with the quasinormal mode analysis demonstrated in this work provides a powerful modeling framework for the emerging field of dielectric cavities with deep sub-wavelength confinement.
