Effect of photonic bandgap on luminescence from silicon nanocrystals.
The modification of the luminescence of silicon nanocrystals experiencing the effect of a photonic bandgap in a 2D photonic crystal was investigated. The time-integrated photoluminescence spectra detected in the plane of the photonic crystal revealed a dip in the light emission corresponding to the wavelength of the bandgap, whose position changes according to the geometry of the prepatterned pillar array. The calculated emission pattern for a pointlike dipole placed in such a structure suggests an inhibition of the spontaneous emission rate at certain directions as a physical reason for the observed modification of luminescence.
Sychugov
Ilya
I
1Laboratory of Materials and Semiconductor Physics, Royal Institute of Technology, SE-16440, Electrum 229, Kista-Stockholm, Sweden.
Elfström
Niklas
N
Hallén
Anders
A
Linnros
Jan
J
Qiu
Min
M