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.