Surface Plasmon-Enhanced Spontaneous Emission from InGaN/GaN Multiple Quantum Wells by Indium Nanoparticles Fabricated Using Nanosphere Lithography

Economic nanofabrication of Ag, Al, Au nanotriangle arrays and In nanoparticle arrays are demonstrated using nanosphere lithography. The sizes of the nanoparticles are precisely tuned when nanospheres with different diameters are used. Localized surface plasmon resonances (LSPR) of the nanoparticle arrays are observed to be strongly dependent on their sizes and the LSPR of In nanoparticle arrays with various sizes cover the whole visible spectrum. By placing In nanoparticle arrays near the InGaN/GaN multiple quantum wells (MQWs), enhanced spontaneous emission is observed when the LSPR of the In nanoparticles matches the emission wavelength of InGaN/GaN MQWs.