Abstract
The diffraction characteristics of a dual-periodicity superlattice-a diffraction grating whose unit cell contains two different regions, one homogeneous and the other periodically nonhomogeneous-were numerically simulated. After choosing the second region to have sinusoidally varying permittivity, the widely used rigorous coupled-wave approach was applied to compute the reflection and transmission efficiency spectrums. An extensive parametric study revealed that the dual-periodicity superlattice exhibits anomalies in the long-wavelength regime which can be considered to be resonance anomalies (RAs), which are distinct from the Rayleigh-Wood anomalies. Also, double-periodicity superlattices exhibit RAs at higher wavelengths than single-periodicity superlattices.
Original language | English (US) |
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Pages (from-to) | 276-285 |
Number of pages | 10 |
Journal | Optik |
Volume | 119 |
Issue number | 6 |
DOIs | |
State | Published - May 1 2008 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering