拓扑光子晶体腔中泄漏辐射与防护的相互作用
Interplay of leakage radiation and protection in topological photonic crystal cavities
摘要：
将拓扑概念引入到光子晶体腔的设计中，由于拓扑保护的前景，在集成光子学中具有很大的应用前景。本文研究二维拓扑光子晶体腔泄漏辐射中的拓扑光限域特征。腔体在全电介质平台中实现，该平台具有电信波长处的光子量子自旋霍尔效应，并支持弱耦合到辐射连续体的螺旋边缘状态。谐振器的模式按比例缩小到单点缺陷在周围的散装晶格的特征在于通过光谱位置和多极性质的本征态。使用远场成像和傅立叶偏振光谱法映射在真实和动量空间中的模式分布，揭示了腔模式的某些属性如何反映在拓扑能带结构中的起源。这包括带反转诱导的限制和平凡和拓扑缺陷腔的模式谱的反转标度。此外，还证明了损耗率中的拓扑保护特征，这些特征在很大程度上不受腔体形状和大小的影响。这些结果构成了使用辐射拓扑腔进行光的片上限制、控制发射波前和增强光与物质相互作用的重要一步。
英文摘要：
The introduction of topological concepts to the design of photonic crystal cavities holds great promise for applications in integrated photonics due to the prospect of topological protection. This study examines the signatures of topological light confinement in the leakage radiation of two-dimensional topological photonic crystal cavities. The cavities are implemented in an all-dielectric platform that features the photonic quantum spin Hall effect at telecom wavelengths and supports helical edge states that are weakly coupled to the radiation continuum. The modes of resonators scaling down to single point defects in the surrounding bulk lattice are characterized via spectral position and multipolar nature of the eigenstates. The mode profiles in real and momentum space are mapped using far field imaging and Fourier spectropolarimetry, revealing how certain properties of the cavity modes reflect on their origin in the topological bandstructure. This includes band-inversion-induced confinement and inverted scaling of mode spectra for trivial and topological defect cavities. Furthermore, hallmarks of topological protection in the loss rates are demonstrated, which are largely unaffected by cavity shape and size. The results constitute an important step toward the use of radiative topological cavities for on-chip confinement of light, control of emitted wave fronts, and enhancing light-matter interactions.
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