Gromyko, D., An, S., Gorelik, S., Xu, J., Lim, L. J., Lee, H. Y. L., Tjiptoharsono, F., Tan, Z.-K., Qiu, C.-W., Dong, Z., & Wu, L. (2024). Unidirectional Chiral Emission via Twisted Bi-layer Metasurfaces. Nature Communications, 15(1). https://doi.org/10.1038/s41467-024-54262-6
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.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the National Research Foundation - Quantum Engineering Programme 2.0
Grant Reference no. : NRF2021-QEP2-02-P03, NRF2021-QEP2-03-P09
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP22-2019-0006, NRF-CRP26-2021- 0004, NRF-CRP30-2023-0003
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Career Development Award
Grant Reference no. : C210112019
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grant
Grant Reference no. : M21K2c0116
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grant
Grant Reference no. : M22K2c0088
This research is supported by core funding from: Agency for Science, Technology and Research (A*STAR) DELTA-Q 2.0
Grant Reference no. : C230917005