论文标题
自由空间耦合波长尺寸磁盘谐振器
Free-space-coupled wavelength-scale disk resonators
论文作者
论文摘要
具有低质量因子（$ q $）的光学微孔子可以通过自由传播波动有效地兴奋，但通常不能，$ Q $的那些通常不能。在这里，我们提出了一个通用模型，用于与自由传播波相互作用的谐振器，并表明由平面波激发的谐振器的存储能量与其$ Q $和方向性的产物成正比。在此结果的指导下，我们设计了一个微型爆炸，并具有周期性突起的圆周，以有效地融合到正常入射的平面波。我们在实验上展示了几种微型设计，其中一种半径为$ 0.75 {λ_0} $，$ q $ 15,000。我们观察到该谐振器在输入能力低至0.7 MW的热诱导的双疗法证实了强烈的激发。它们的小脚印和模式量以及其激发和制造的简单性使波长尺度，自由空间耦合的微型企业对传感，增强发射和非线性有吸引力，并作为微型激光腔。
Optical microresonators with low quality factor ($Q$) can be efficiently excited by and scatter freely propagating optical waves, but those with high $Q$ typically cannot. Here, we present a universal model for resonators interacting with freely propagating waves and show that the stored energy of a resonator excited by a plane wave is proportional to the product of its $Q$ and directivity. Guided by this result, we devise a microdisk with periodic protrusions in its circumference that couples efficiently to normally incident plane waves. We experimentally demonstrate several microdisk designs, including one with a radius of $0.75{λ_0}$ and $Q$ of 15,000. Our observation of thermally-induced bistability in this resonator at input powers as low as 0.7 mW confirms strong excitation. Their small footprints and mode volumes and the simplicity of their excitation and fabrication make wavelength-scale, free-space-coupled microdisks attractive for sensing, enhancing emission and nonlinearity, and as micro-laser cavities.
