Dual wavelength lasing of InGaN/GaN axial-heterostructure nanorod lasers
- Authors
- Chun, So Yeon; Yoo, Gang Yeol; Jeong, Seonghyun; Park, Seung Min; Eo, Yun Jae; Kim, Woong; Do, Young Rag; Song, Jae Kyu
- Issue Date
- 14-8월-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.11, no.30, pp.14186 - 14193
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 11
- Number
- 30
- Start Page
- 14186
- End Page
- 14193
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/63526
- DOI
- 10.1039/c9nr03906f
- ISSN
- 2040-3364
- Abstract
- Optical confinement effects are investigated in InGaN/GaN axial-heterostructure nanolasers. Cylindrical nanorods with GaN/InGaN/GaN structures are prepared using combined processes of top-down and bottom-up approaches. The lasing of InGaN is observed at a low threshold (1 mu J cm(-2)), which is attributed to an efficient carrier transfer process from GaN to InGaN. The lasing of GaN is also found in the threshold range of 10-20 mu J cm(-2) with a superlinear increase in emission intensity and high quality factors (Q = 1000), implying that dual wavelengths of lasing are tunable as a function of excitation intensity. The non-classical Fabry-Perot modes suggest strong light-matter interactions in nanorods by optical confinement effects. The polarization of lasing indicates that the non-classical modes are in the identical transverse mode, which supports the formation of exciton-polaritons in nanorods. Polariton lasing in a single axial-heterostructure nanorod is observed for the first time, which proposes small-sized light sources with low threshold, polarized light, and tunable wavelengths in a single nanorod.
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