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用于自发辐射聚焦和光束形成的发光金属透镜和元轴锥镜。

Light-emitting metalenses and meta-axicons for focusing and beaming of spontaneous emission.

作者信息

Mohtashami Yahya, DeCrescent Ryan A, Heki Larry K, Iyer Prasad P, Butakov Nikita A, Wong Matthew S, Alhassan Abdullah, Mitchell William J, Nakamura Shuji, DenBaars Steven P, Schuller Jon A

机构信息

Department of Electrical and Computer Engineering, University of California Santa Barbara, CA, USA.

Department of Physics, University of California Santa Barbara, CA, USA.

出版信息

Nat Commun. 2021 Jun 14;12(1):3591. doi: 10.1038/s41467-021-23433-0.

Abstract

Phased-array metasurfaces have been extensively used for wavefront shaping of coherent incident light. Due to the incoherent nature of spontaneous emission, the ability to similarly tailor photoluminescence remains largely unexplored. Recently, unidirectional photoluminescence from InGaN/GaN quantum-well metasurfaces incorporating one-dimensional phase profiles has been shown. However, the possibility of generating arbitrary two-dimensional waveforms-such as focused beams-is not yet realized. Here, we demonstrate two-dimensional metasurface axicons and lenses that emit collimated and focused beams, respectively. First, we develop off-axis meta-axicon/metalens equations designed to redirect surface-guided waves that dominate the natural emission pattern of quantum wells. Next, we show that photoluminescence properties are well predicted by passive transmission results using suitably engineered incident light sources. Finally, we compare collimating and focusing performances across a variety of different light-emitting metasurface axicons and lenses. These generated two-dimensional phased-array photoluminescence waveforms facilitate future development of light sources with arbitrary functionalities.

摘要

相控阵超表面已被广泛用于相干入射光的波前整形。由于自发发射的非相干性质,类似地定制光致发光的能力在很大程度上仍未得到探索。最近,已展示了来自包含一维相位分布的InGaN/GaN量子阱超表面的单向光致发光。然而,生成任意二维波形(如聚焦光束)的可能性尚未实现。在这里,我们展示了分别发射准直光束和聚焦光束的二维超表面轴棱锥和透镜。首先,我们开发了离轴超轴棱锥/超透镜方程,旨在重定向主导量子阱自然发射模式的表面导波。接下来,我们表明,使用适当设计的入射光源,被动传输结果可以很好地预测光致发光特性。最后,我们比较了各种不同的发光超表面轴棱锥和透镜的准直和聚焦性能。这些生成的二维相控阵光致发光波形促进了具有任意功能的光源的未来发展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d740/8203637/5720924b5d2e/41467_2021_23433_Fig1_HTML.jpg

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