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Deterministic Yet Flexible Directional Light Emission from Spiral Nanomembrane Cavities

2019-11-01

Authors: Wang, JW; Yin, Y; Yang, YD; Hao, Q; Tang, M; Wang, XX; Saggau, CN; Karnaushenko, D; Yan, XH; Huang, YZ; Ma, LB; Schmidt, OG

ACS PHOTONICS

Volume: 6 Issue: 10 Pages: 2537-2544 Published: OCT 2019 Language: English Document type: Article

DOI: 10.1021/acsphotonics.9b00992

Abstract:

Controlling the flow of light emitted from structures in micro/nanoscale is crucial for on-chip active photonic devices and their tremendous

applications. Although previous reports focus on improving the directionality along a fixed angle, the realization of flexible directional

emission becomes highly desired for simultaneously manipulating multiple light flows with different properties (e.g., wavelength,

polarization, and wavevector), which paves the way to emerging two and one-half dimensional and three-dimensional (3D) integrated photonics

technologies. Here, we propose self-rolled-up nanomembrane-based asymmetric cavities with a deliberately controlled spiral shape and

demonstrate 3D directional light emissions. The interaction between 3D confined optical resonances and a spiral nanomembrane edge results in

deterministic yet tunable emission directions. Polarization-selective directionality as well as the transition between bi- and

unidirectional emission regimes is revealed by adjusting the cavity confinement and mode chirality. The spiral nanomembrane cavities

featuring adjustable structural asymmetry provide new insights into chiral light-matter interaction and manipulating light emission for

multiplexed classical and quantum light sources.

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