Surface-plasmon-enhanced light emitters based on InGaN quantum wells

Abstract

We present a design of plasmonic cavities that consists of two sets of 1-D plasmonic crystal reflectors on a plasmonic trench waveguide. A 'reverse image mold' (RIM) technique was developed to pattern high-resolution silver trenches and to embed emitters at the cavity field maximum, and FDTD simulations were performed to analyze the frequency response of the fabricated devices. Distinct cavity modes were observed from the photoluminescence spectra of the organic dye embedded within these cavities. The cavity geometry facilitates tuning of the modes through a change in cavity dimensions. Both the design and the fabrication technique presented could be extended to making trench waveguide-based plasmonic devices and circuits. "Quantum nature of a strongly coupled single quantum dot-cavity system," Nature 445(7130), 896-899 (2007). 4. S. Kühn, U. Håkanson, L. Rogobete, and V. Sandoghdar, "Enhancement of single-molecule fluorescence using a gold nanoparticle as an optical nanoantenna," Phys. between surface plasmon-polaritons and organic molecules in subwavelength hole arrays," Phys. Rev. B 71(3), 035424 (2005). 9. P. Anger, P. Bharadwaj, and L. Novotny, "Enhancement and quenching of single-molecule fluorescence," Phys.

Electrocatalytic oxidation enhancement at the surface of InGaN films and nanostructures grown directly on Si(111)

“…Ill-nitride semiconductors are of high interest for optoelectronics and high-power electronics [1][2][3]. Recently, the application fields were extended to electrochemical electrodes.…”

Enhanced light extraction from InGaN/GaN quantum wells with silver gratings

“…[2][3][4][5] One of them consists in using metallic structures to enhance the radiative rate thanks to the surface plasmons they support. 6,7 These plasmon modes have a high local density of states, and consequently catch the main part of the emission, which can then be coupled to radiative light with a corrugation (either periodic 6 or not 8,9 ). Luminescence enhancements of up to 15 have been demonstrated with these processes.…”

“…As the sample is excited through the substrate, we assume that the QW is excited in the same way whether the surface is covered by a grating or not. 6 The change in the extraction efficiency can be obtained by calculating the ratio between the maximal intensity under and outside the metallic grating. To clearly separate the effect of the material forming the grating and the covering layer, three different types of corrugations were investigated: a polymer grating, a metallic grating, and a metallic grating covered with PVA.…”

Photonic-crystal GaN light-emitting diodes with tailored guided modes distribution

“…More recently, another stategy was also explored: light extraction by coupling to the surface plasmons of Ag films. [3][4][5] Two schemes can be considered for PhC-assisted LEDs: formation of band gaps to prevent emission into guided modes, 6 or PhCs acting as diffraction gratings to extract guided light. [7][8][9][10][11] While good results have been reported regarding the former scheme for low-temperature photoluminescence experiments, 12 extension to room temperature may be limited by increased loss due to nonradiative recombination.…”