Broadband antireflection with halide-perovskite metasurfaces

双层超材料中的反反射设计

Antireflection by design in bilayer metasurfaces

本文提出了一种双层超材料设计方法，通过垂直集成实现同时作为相位调节器和阻抗匹配堆叠的功能，从而在1310nm波长下实现低反射率和衍射受限的聚焦性能。

Enhancing the Three-Photon Luminesce via the Resonance in Lead Halide Perovskite Metasurfaces

Lead halide perovskites (MAPbX3) have emerged as promising materials for photovoltaic and optoelectronic devices. However, their exceptional nonlinear properties have not been fully exploited in nanophotonics yet. Herein we fabricate MAPbX3 perovskite metasurfaces and explore their internal nonlinear processes. While both of third-order harmonic generation (THG) and three-photon luminescence are generated, the latter one is less affected by the material loss and has been significantly enhanced by a factor of 60. The corresponding simulation reveals that the improvement is caused by the resonan…

Active meta-optics and nanophotonics with halide perovskites

Meta-optics based on optically resonant all-dielectric structures is a rapidly developing research area driven by its potential applications for low-loss efficient metadevices. Active, light-emitting subwavelengh nanostructures and metasurfaces are of a particular interest for meta-optics, as they offer unique opportunities for novel types of compact light sources and nanolasers. Recently, the study of halide perovskites has attracted an enormous attention due to their exceptional optical and electrical properties. As a result, this family of materials can provide a prospective platform for mo…

Electrically driven exciton-polaritons in metal halide perovskite metatransistors

Achieving electrical injection of exciton-polaritons, half-light, half-matter quasiparticles arising from the strong coupling between photonic and excitonic resonances, is a crucial milestone to scale up polaritonic devices such as optical computers, quantum simulators and inversionless lasers. Here we present a new approach to achieve strong coupling between electrically injected excitons and photonic bound states in the continuum of a dielectric metasurface monolithically patterned in the channel of a light-emitting transistor. Exciton-polaritons are generated by coupling electrically inject…

用于抑制宽带上的反射的超表面

Metasurfaces for suppressing reflection over broadband

已研究了具有圆锥形深度轮廓的准周期性空气孔阵列图案化的表面在抑制450-1350 nm波长范围内的空气-基底反射（受限于我们的测量）中的有效性。研究了准周期性空气孔图案、孔深和发射角对所观察到的微扰行为的影响。图案化石英衬底在近垂直入射下的平均光学透射率大于97%，反射率小于2%。具有450 nm薄梯度稀疏区域的图案化石英表面在高达30°（受我们的测量限制）的入射角下保持抗反射特性。

Thermo-optically Reconfigurable PbTe Mie Resonator Meta-atoms

Subwavelength Mie resonators have enabled new classes of optical antennas1-4, photodetectors5,6, antireflection coatings7, and magnetic mirrors8 and can act as the basic meta-atoms constituents of low-loss dielectric metasurfaces2-4,8-10. In any application, tunable Mie resonances are key to achieving dynamic and reconfigurable operation11,12. Sub-linewidth tuning has been achieved via coupling to liquid crystals13, ultrafast free-carrier injection14,15,16,17, stretchable substrates18 and with phase change materials19. Here, we demonstrate ultra-wide dynamic tuning of PbTe Mie resonators fabri…