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The extensive literature on quantum‐well infrared photodetectors (QWIPs) is reviewed. A detailed discussion is given on the device physics of the intersubband absorption and hot‐carrier transport… (More)
We demonstrate a novel 10.8 μm superlattice infrared detector based on doped quantum wells of GaAs/AlGaAs. Intersubband resonance radiation excites an electron from the ground state into the first… (More)
The concept of crystal ionicity has proved to be a useful unifying concept for understanding chemical trends in diverse problems in chemistry and solid state physics. In particular, the dielectric… (More)
We have used the technique of static field induced second harmonic generation in liquids to determine the second order hyperpolarizability β, and the third order hyperpolarizability γ, for a wide… (More)
Detector Applications.- Random Scattering Optical Couplers for Quantum Well Infrared Photodetectors.- Performance of Grating Coupled AlGaAs/GaAs Quantum Well Infrared Detectors and Detector Arrays.-… (More)
We report the first single-photon counting experiments in a III-V APD. High quantum efficiency, η=12%, near-room-temperature operation, T=-20°C, has been achieved at long wavelengths λ=1.3 μm.
A simple localized-bond-charge model for the calculation of nonlinear optical susceptibilities is presented. We find that there are three important contributions to the nonlinearity, namely, the bond… (More)
Medium wavelength infrared (MWIR) detectors in the 3–5 μm band are demonstrated using bound to continuum state intersubband absorption in lattice‐matched InGaAs/InAlAs multiquantum well (MQW)… (More)