Abstract

The outcoupling of light from AlGaAs-based light-emitting diodes (LEDs) can be improved by means of metal nanoparticles deposited on the surface of the device: light that would otherwise remain trapped in the high- refractive-index material by total internal reflection is scattered to the outside. We present an experimental study on the emission enhancement produced by single isolated gold nanoparticles of various sizes (60150nm in diameter) and compare the results with numerical simulations. We find a clear enhancement as long as the dipole plasmon resonance of the particle is at a shorter wavelength than the LED emission. If the plasmon resonance coincides with the LED emission or is at a larger wavelength, the enhancement turns into damping. The simulations indicate that this latter effect is mainly caused by the particle quadrupole resonance producing absorption.

© 2011 Optical Society of America

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