Directional lasing in resonant semiconductor nanoantenna arrays

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Directional lasing in resonant semiconductor nanoantenna arrays
Title:
Directional lasing in resonant semiconductor nanoantenna arrays
Journal Title:
Nature Nanotechnology
Publication Date:
20 August 2018
Citation:
Ha, S.T., Fu, Y.H., Emani, N.K. et al. Directional lasing in resonant semiconductor nanoantenna arrays. Nature Nanotech 13, 1042–1047 (2018). https://doi.org/10.1038/s41565-018-0245-5
Abstract:
High-index dielectric and semiconductor nanoparticles supporting strong electric and magnetic resonances have drawn significant attention in recent years. However, until now, there have been no experimental reports of lasing action from such nanostructures. Here, we demonstrate directional lasing, with a low threshold and high quality factor, in active dielectric nanoantenna arrays achieved through a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars. The leaky resonance is formed by partially breaking a bound state in the continuum generated by the collective, vertical electric dipole resonances excited in the nanopillars for subdiffractive arrays. We control the directionality of the emitted light while maintaining a high quality factor (Q = 2,750). The lasing directivity and wavelength can be tuned via the nanoantenna array geometry and by modifying the gain spectrum of GaAs with temperature. The obtained results provide guidelines for achieving surface-emitting laser devices based on active dielectric nanoantennas that are compact and highly transparent.
License type:
PublisherCopyrights
Funding Info:
A*STAR SERC Pharos program, Grant No. 152 73 00025 (Singapore).
Description:
ISSN:
1748-3387
1748-3395
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