Dual wavelength lasing of InGaN/GaN axial-heterostructure nanorod lasers
| Autor: | So Yeon Chun, Seung Min Park, Young Rag Do, Seonghyun Jeong, Gang Yeol Yoo, Woong Kim, Yun Jae Eo, Jae Kyu Song |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Physics::Optics Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Laser Polarization (waves) 01 natural sciences 0104 chemical sciences Transverse mode law.invention Condensed Matter::Materials Science Wavelength law Polariton Optoelectronics General Materials Science Nanorod 0210 nano-technology business Lasing threshold |
| Zdroj: | Nanoscale. 11:14186-14193 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | 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 μJ 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 μJ 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-Pérot 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. |
| Databáze: | OpenAIRE |
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