posted on 2019-06-24, 00:00authored byYuduo Xie, Jingya Sun, Lan Jiang, Qingsong Wang, Feifei Wang, Changji Pan
Fabry–Pérot
interference has been employed in optical
fibers, sensors, electron optics, and so on. The photoluminescence
(PL) spectra of a gallium nitride (GaN)-based light-emitting diode
(LED), which were irradiated using various femtosecond (fs)-laser
fluences, were studied. Notably, the interesting oscillation of PL
was observed on the LED under irradiation with specific fs-laser fluence.
The PL oscillation spectra were well fitted by the product of modulation
and unperturbed luminescence. This may be attributed to surface cylinder-like
nanostructures. The decrease of PL intensity was caused by the defect
created through fs-laser irradiation. In addition, the film thickness
and the refractive index could be calculated based on the data extracted
from the PL oscillation spectra. Our report demonstrated that the
optical properties of a GaN-based LED were engineered based on the
surface morphology and modulated by Fabry–Pérot interference.