We experimentally investigate the multifold intensity enhancement and spectral narrowing of photoluminescence (PL) from amorphous silicon quantum dots (a-Si QDs) embedded in a silicon-rich SiOx film of the Ag/SiOx:a-Si QDs/Au plasmonic nanocavity, through the resonance coupling between the localized surface plasmon (LSP) mode and the Fabry-Pérot (FP) cavity mode, by tuning a one-dimensional (1-D) Ag grating on the top. The LSP resonance can be precisely tuned by adjusting the Ag line widths of the 1-D Ag grating. It is found that the LSP mode strongly couples with the FP cavity mode, resulting in a narrower emission line width and a larger PL enhancement. An optimized Ag grating structure is found to exhibit a narrow emission line width of 15 nm and 2.77-fold enhancement in the PL peak intensity, as compared to an SiOx:a-Si QDs/Au structure without 1-D Ag grating, due to the strong resonance coupling between the two modes.
Photonic crystals (PhCs) were typically fabricated on the light emitting surface of light emitting
diodes (LEDs) to improve light extraction, which is regarded as the weak coupling between the
laterally propagated light in the epi-layers and the surface nanostructure. This work demonstrates
GaN-based LEDs with the PhC structure on the mesa surface and nanohole arrays surrounding the light
emitting mesa. Our new device (SHLED) shows a 56% higher optical output power than the planar
structure (PLED), as compared with the 40% improvement of the surface PhC device (SLED) over
PLED. The output power of SHLED is higher than that of SLED due to the enhanced diffraction of low
order modes propagated in the lateral direction, in addition to the higher order mode light diffraction
from the surface PhCs. From the relative angular spectra, the interaction of in-plane optical wave with
the nanoholes (which are etched through MQWs) is much stronger than that with surface PhCs,
suggesting an efficient light diffraction to the surface normal by nanoholes.
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