Control of light output from planar optical devices using wavelength-scale microstructure

Summary form only given. The control of waveguided modes in light-emitting materials is an important goal in quantum optics. It is of particular practical interest in planar optical devices such as light emitting diodes (LED's), in which most of the generated light is confined in waveguided modes, leading to a loss of usefully extractable radiation. In this paper we report the use of wavelength-scale microstructure to control light emission from thin films. In particular we show that lateral microstructure can be incorporated into an LED structure giving a doubling of the efficiency of the device.