We develop a strategy to reduce large reflection losses from quantum-well Bragg structures through an anti-reflection coating technique. It is based on generalized refractive indices, which we call "effective coupling indices" (ECIs), that can be introduced to describe the coupling of light into quantum-well Bragg structures. For the example of a spectrally narrow band, which is relevant for slow-light applications, we clarify the dependence of the ECIs on the spectral bandwidth and discuss the relation between the ECIs and the group-velocity index. Numerical simulations of reflection spectra demonstrate the effectiveness of the ECI concept.
|Original language||English (US)|
|Number of pages||10|
|Journal||Journal of the Optical Society of America B: Optical Physics|
|Publication status||Published - 2007|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics