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 ($60–150\mathrm{nm}$ 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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