Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes

Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes
Title:
Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes
Other Titles:
ACS Nano
Publication Date:
27 May 2020
Citation:
Abstract:
On-chip light sources are critical for the realization of fully integrated photonic circuitry. So far, semiconductor miniaturized lasers have been mainly limited to sizes on the order of a few microns. Further reduction of sizes is challenging fundamentally due to the associated radiative losses. While using plasmonic metals helps to reduce radiative losses and sizes, they also introduce Ohmic losses hindering real improvements. In this work, we show that, making use of quasibound states in the continuum, or supercavity modes, we circumvent these fundamental issues and realize one of the smallest purely semiconductor nanolasers thus far. Here, the nanolaser structure is based on a single semiconductor nanocylinder that intentionally takes advantage of the destructive interference between two supported optical modes, namely Fabry–Perot and Mie modes, to obtain a significant enhancement in the quality factor of the cavity. We experimentally demonstrate the concept and obtain optically pumped lasing action using GaAs at cryogenic temperatures. The optimal nanocylinder size is as small as 500 nm in diameter and only 330 nm in height with a lasing wavelength around 825 nm, corresponding to a size-to-wavelength ratio as low as 0.6.
License type:
PublisherCopyrights
Funding Info:
The authors acknowledge the financial support from A*STAR: SERC Pharos program, Singapore (Grant No. 152 73 00025) and Singapore International Graduate Award.
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsnano.0c02730
ISSN:
1936-0851
1936-086X
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