Optimization of two dimensional gratings for very long wavelength quantum well infrared photodetectors Academic Article uri icon

abstract

  • We have performed a detailed study of two‐dimensional grating coupling for quantum well infrared photodetectors in the very long wavelength spectral region λ∼ 16–17 μm. Using calculations based on the modal expansion method we quantitatively explain the double peaked responsivity spectrum. By optimizing the grating parameters we achieve a normal incidence responsivity and detectivity which are three times larger than the 45° angle of incidence geometry.

publication date

  • January 1, 1994