六方氮化硼纳米光子学
Hexagonal boron nitride nanophotonics
摘要：
纳米光子器件的小型化和多波长性能的全球趋势推动了对新现象的研究，例如连续体和微电子学中的束缚态，以及对高折射率和强各向异性材料和超颖表面的调查。六方氮化硼（hBN）由于其固有的各向异性和具有原子级平整表面的高质量单晶生长前景，是未来纳米光子学的重要材料之一。在这里，我们提出了高度准确的光学常数的hBN在250-1700 nm的宽波长范围内结合成像椭偏测量扫描近场光学显微镜和第一原理量子力学计算。hBN的高折射率（在紫外线（UV）和可见光范围内高达2.75）、0.7的宽带双折射率以及可忽略的光学损耗使其成为UV和可见光范围光子学的杰出材料。基于我们的测量结果，我们提出并设计了新的光学元件：handedness保持镜和亚波长波导的尺寸为40 nm的可见光和紫外光范围内，分别操作。值得注意的是，我们的研究结果为弥合光子学和电子学之间的尺寸差距提供了独特的机会。
英文摘要：
A global trend to miniaturization and multiwavelength performance of nanophotonic devices drives research on novel phenomena, such as bound states in the continuum and Mietronics, as well as the survey for high-refractive index and strongly anisotropic materials and metasurfaces. Hexagonal boron nitride (hBN) is one of promising materials for the future nanophotonics owing to its inherent anisotropy and prospects of high-quality monocrystals growth with atomically flat surface. Here, we present highly accurate optical constants of hBN in the broad wavelength range of 250-1700 nm combining the imaging ellipsometry measurements scanning near-field optical microscopy and first-principle quantum mechanical computations. hBN's high refractive index, up to 2.75 in ultraviolet (UV) and visible range, broadband birefringence of 0.7, and negligible optical losses make it an outstanding material for UV and visible range photonics. Based on our measurement results, we propose and design novel optical elements: handedness-preserving mirrors and subwavelength waveguides with dimensions of 40 nm operating in the visible and UV range, respectively. Remarkably, our results offer unique opportunity to bridge the size-gap between photonics and electronics.
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