Abstract
We develop a theory to study the diffraction and absorption properties of a lamellar grating etched on top of a plane stratified medium which is an inorganic multiple quantum well made of isotropic and anisotropic materials. It is shown that the grating characteristics can be optimized in such a way that even when illuminated under normal incidence at 10.6 μm wavelength, the multiple quantum well may absorb 40% of the incident energy. Changing the permittivity tensor of the components of the superlattice by acting on the intraband transitions via an electrical or optical action (Stark effect for example) opens a way to infrared modulation and detection.
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