有损介电范德华异质结构中的封装空腔谐振器
Encapsulated void resonators in lossy dielectric van der Waals heterostructures
AI总结：
本文提出在高损耗介电材料中构造空气空腔谐振器，并通过范德华异质结构封装实现超过150 nm的谐振蓝移，为扩展光子器件材料与光谱范围提供了新平台。
摘要：
介电光学谐振器传统上依赖于兼具高折射率和低光学损耗的材料。这类材料在可见光谱及更短波长范围内的可用性十分稀缺。通过放宽对低损耗的要求，可以规避这一限制。我们证明，高损耗介电材料可以通过结构化来支持将光限制在空气空腔中的光学谐振。我们在理论上设计了可见光谱中的空腔谐振，并识别了由空腔阵列支持谐振模式。在实验上，我们在二硒化钨中制备了空腔阵列，并利用远场反射测量和扫描近场光学显微镜对受限谐振进行了表征。通过范德华异质结构组装，我们用六方氮化硼封装空腔，这减小了空腔体积，导致空腔谐振产生超过150 nm的大幅光谱蓝移。我们的工作展示了一个适用于有损材料的多功能光学平台，扩展了适用材料的范围以及光子器件的光谱范围。
英文摘要：
Dielectric optical resonators traditionally rely on materials with the combination of high refractive indices and low optical losses. Such materials are scarce for operation in visible spectrum and shorter wavelengths. This limitation can be circumvented by relaxing the requirement of low losses. We demonstrate that highly lossy dielectric materials can be structured to support optical resonances that confine light in air voids. We theoretically design void resonances in the visible spectrum and identify resonant modes supported by void arrays. Experimentally, we fabricate void arrays in tungsten diselenide and characterize the confined resonances using far-field reflectance measurements and scanning near-field optical microscopy. Using van der Waals heterostructure assembly, we encapsulate the voids with hexagonal boron nitride which reduces the void volume causing a large spectral blue shift of the void resonance exceeding 150 nm. Our work demonstrates a versatile optical platform for lossy materials, expanding the range of suitable materials and the spectral range of photonic devices.
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