| Full text | |
| Author(s): |
Martins, R. J.
[1]
;
Siqueira, J. P.
[1]
;
Clavero, I. Manglano
[2]
;
Margenfeld, C.
[2]
;
Fuendling, S.
[2]
;
Vogt, A.
[2]
;
Waag, A.
[2]
;
Voss, T.
[2]
;
Mendonca, C. R.
[1]
Total Authors: 9
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, Caixa Postal 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Braunschweig Univ Technol, Inst Semicond Technol, Braunschweig - Germany
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of Applied Physics; v. 123, n. 24 JUN 28 2018. |
| Web of Science Citations: | 1 |
| Abstract | |
We studied the near-band-edge emission (NBE) and yellow defect luminescence (YL) of GaN under below bandgap excitation with 40-fs laser pulses at a wavelength of 775 nm. Even though in this case three-photon absorption processes are required for the excitation of band-to-band transitions, fourth-order (I-NBE proportional to I-exc(4)) and sub-linear (I-YL proportional to I-exc(0.5)) dependencies were observed for the intensity of the NBE and YL as a function of the excitation intensity, respectively. Modelling the carrier dynamics with a few-level rate-equation model revealed that, for high excitation irradiances, the electron-hole population generated by three-photon absorption is such that the NBE recombination rate is intensified (exponent > 3) and, at the same time, the competition between the electron capturing and the defect-level emission rate suppresses the YL (exponent < 1). Published by AIP Publishing. (AU) | |
| FAPESP's process: | 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication |
| Grantee: | Cleber Renato Mendonça |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 12/00702-2 - Coherent Control of nonlinear processes via genetic algorithm: study of spectral phase modulation through principal component analysis |
| Grantee: | Renato Juliano Martins |
| Support Opportunities: | Scholarships in Brazil - Doctorate |