Radial bound states in the continuum for polarization-invariant nanophotonics.
Radial bound states in the continuum for polarization-invariant nanophotonics.
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DOI：
10.1038/s41467-022-32697-z
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发表时间：
2022-08-25
影响因子：
16.6
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中科院分区：
文献类型：
--
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基于束缚态物理的全介质纳米光子学在纳米级光操纵、频率转换和光学传感等领域显示出突破性的应用。领先的BIC实现范围从具有局域电磁场的孤立纳米天线到具有可控共振质量(Q)因子的对称保护的亚表面。然而，它们要么需要具有复杂光束整形光学的结构光照明，要么需要偏振敏感单元单元的大型制造密集型阵列，这阻碍了定制的纳米光子应用和芯片上集成。在本文中，我们引入了连续体中的径向准束缚态(径向BICs)作为一类新的由介质棒对谐振器环中的结构非对称性控制的径向分布电磁模式。径向BIC平台提供偏振不变和可调谐的高Q共振峰，近场强增强，占地面积低至2微米。我们展示了用于灵敏生物分子检测的径向BIC实现，以及从过渡金属二卤化物单层增强的二次谐波产生，为用于多功能光物质耦合、多路传感和高密度片上光子学的紧凑型、光谱选择性和偏振不变元器件开辟了新的前景。在他们关于径向BIC的工作中，作者实现了一个具有高共振Q因子和极大地减少空间占用量的纳米光子平台，非常适合于增强芯片上的生物分子传感和非线性光产生。
All-dielectric nanophotonics underpinned by the physics of bound states in the continuum (BICs) have demonstrated breakthrough applications in nanoscale light manipulation, frequency conversion and optical sensing. Leading BIC implementations range from isolated nanoantennas with localized electromagnetic fields to symmetry-protected metasurfaces with controllable resonance quality (Q) factors. However, they either require structured light illumination with complex beam-shaping optics or large, fabrication-intense arrays of polarization-sensitive unit cells, hindering tailored nanophotonic applications and on-chip integration. Here, we introduce radial quasi-bound states in the continuum (radial BICs) as a new class of radially distributed electromagnetic modes controlled by structural asymmetry in a ring of dielectric rod pair resonators. The radial BIC platform provides polarization-invariant and tunable high-Q resonances with strongly enhanced near fields in an ultracompact footprint as low as 2 µm2. We demonstrate radial BIC realizations in the visible for sensitive biomolecular detection and enhanced second-harmonic generation from monolayers of transition metal dichalcogenides, opening new perspectives for compact, spectrally selective, and polarization-invariant metadevices for multi-functional light-matter coupling, multiplexed sensing, and high-density on-chip photonics. In their work on radial BICs, the authors realize a nanophotonic platform with high resonance Q factors and drastically reduced spatial footprint ideally suited for enhanced on-chip biomolecular sensing and nonlinear light generation.
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