Enhancement of the optical gain in GaAs nanocylinders for nanophotonic applications

Tapar, J. and Prasanth, K. and Emani, N.K. and et al, . (2020) Enhancement of the optical gain in GaAs nanocylinders for nanophotonic applications. Journal of Applied Physics, 127 (15). p. 153102. ISSN 0021-8979

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Semiconductor nanolasers based on microdisks, photonic crystal cavities, and metallo-dielectric nanocavities have been studied during the last few decades for on-chip light source applications. However, practical realization of low threshold, room temperature semiconductor nanolasers is still a challenge due to the large surface-to-volume ratio of the nanostructures, which results in low optical gain and hence higher lasing threshold. Furthermore, the gain in nanostructures is an important parameter for designing all-dielectric metamaterial-based active applications. Here, we investigate the impact of p-type doping, compressive strain, and surface recombination on the gain spectrum and the spatial distribution of carriers in GaAs nanocylinders. Our analysis reveals that the lasing threshold can be lowered by choosing the right doping concentration in the active III-V material combined with compressive strain. This combination of strain and p-type doping shows 100× improvement in gain and approximately five times increase in modulation bandwidth for high-speed operation.

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IITH Creators:
IITH CreatorsORCiD
Prasanth Kumar, R.UNSPECIFIED
Emani, Naresh Kumarhttps://orcid.org/0000-0002-0488-921X
Item Type: Article
Uncontrolled Keywords: Active application; Compressive strain; Doping concentration; High-speed operation; Modulation bandwidth; Photonic crystal cavities; Room temperature semiconductors; Surface recombinations
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 11 Aug 2021 10:57
Last Modified: 21 Feb 2022 11:42
URI: http://raiith.iith.ac.in/id/eprint/8800
Publisher URL: http://doi.org/10.1063/1.5132613
OA policy: https://v2.sherpa.ac.uk/id/publication/9867
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