Unidirectional Chiral Emission via Twisted Bi-layer Metasurfaces

Dmitrii Gromyko, Shu An, Sergey Gorelik, Jiahui Xu, Li Jun Lim, Henry Yit Loong Lee, Febiana Tjiptoharsono, Zhi-Kuang Tan, Cheng-Wei Qiu (), Zhaogang Dong () and Lin Wu ()
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Dmitrii Gromyko: Singapore University of Technology and Design (SUTD)
Shu An: Agency for Science Technology and Research (A*STAR)
Sergey Gorelik: Agency for Science, Technology and Research (A*STAR)
Jiahui Xu: National University of Singapore
Li Jun Lim: National University of Singapore
Henry Yit Loong Lee: Agency for Science Technology and Research (A*STAR)
Febiana Tjiptoharsono: Agency for Science Technology and Research (A*STAR)
Zhi-Kuang Tan: National University of Singapore
Cheng-Wei Qiu: National University of Singapore
Zhaogang Dong: Singapore University of Technology and Design (SUTD)
Lin Wu: Singapore University of Technology and Design (SUTD)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Controlling and channeling light emissions from unpolarized quantum dots into specific directions with chiral polarization remains a key challenge in modern photonics. Stacked metasurface designs offer a potential compact solution for chirality and directionality engineering. However, experimental observations of directional chiral radiation from resonant metasurfaces with quantum emitters remain obscure. In this paper, we present experimental observations of unidirectional chiral emission from a twisted bi-layer metasurface via multi-dimensional control, including twist angle, interlayer distance, and lateral displacement between the top and bottom layers, as enabled by doublet alignment lithography (DAL). First, maintaining alignment, the metasurface demonstrates a resonant intrinsic optical chirality with near-unity circular dichroism of 0.94 and reflectance difference of 74%, where a high circular dichroism greater than 0.9 persists across a wide range of angles from −11 to 11 degrees. Second, engineered lateral displacement induces a unidirectional chiral resonance, resulting in unidirectional chiral emission from the quantum dots deposited onto the metasurface. Our bi-layer metasurfaces offer a universal compact platform for efficient radiation manipulation over a wide angular range, promising potential applications in miniaturized lasers, grating couplers, and chiral nanoantennas.

Date: 2024
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DOI: 10.1038/s41467-024-54262-6

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