Enhanced light extraction through randomly nanotextured interfaces

Spilios Riyopoulos

doi:10.1117/12.570480

20 December 2004 Enhanced light extraction through randomly nanotextured interfaces

Spilios Riyopoulos

Proceedings Volume 5594, Physics and Applications of Optoelectronic Devices; (2004) https://doi.org/10.1117/12.570480
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

The use of micro-structured interfaces has been shown to increase the extracted light portion far beyond the total reflection cone that limits extraction from flat surfaces. However, earlier theoretical treatments based on ray tracing, break down for nano-structured features smaller than the material wavelength. We apply a new analytic method converting the boundary conditions at the interface into surface currents following from the surface discontinuity in the perpendicular electric and parallel displacement vectors. These currents serve as source terms driving the transmitted radiation, computed by applying the full wave propagator. Analytic formulae yield the transmitted fraction for quasi-periodic surface features involving random variation of the feature size and period. A single incidence of an incoming plane wavefront suffices for transmission, while, in the ray tracing approach, many bounces with an opposing surface are required until the randomly changing angle of incidence falls within the extraction cone.

Citation Download Citation

Spilios Riyopoulos "Enhanced light extraction through randomly nanotextured interfaces", Proc. SPIE 5594, Physics and Applications of Optoelectronic Devices, (20 December 2004); https://doi.org/10.1117/12.570480

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