Optical nonlinearities in asymmetric quantum wells due to resonant intersubband transitions
are analyzed using a compact density-matrix approach. The large dipolar matrix elements …

Publisher Summary This chapter focuses on the basic aspects of intersubband transitions,
with the main emphasis on linear absorption. An expression for the intersubband absorption …

The changes in the real index of refraction and the optical absorption for conduction
intersubband transitions in AIXGal _ &/GaAs/AIXGal _ As quantum wells are examined as a …

We present a detailed and thorough study of a wide variety of quantum well infrared
photodetectors (QWIPs), which were chosen to have large differences in their optical and …

A self-assembled Ge/Si quantum dot interlevel infrared photodetector operating at room
temperature and at normal incidence is demonstrated. The spectral response exhibits two …

Narrow gap semiconductors obey the general rules of semiconductor science, but often
exhibit extreme features of these rules because of the same properties that produce their …

A tunable infrared modulator and/or switch using intersubband Stark shift in a step quantum
well is discussed. The device utilizes the intersubband absorption and the large change of …

Infrared spectroscopy is a powerful tool for revealing some key properties of electrons in the
minibands of semiconductor superlattices. Some theoretical foundations of superlattice …

The feasibility of optically pumped infrared laser based on the intersubband transitions in
multiple quantum wells is studied theoretically. The criteria for population inversion and …

Large Stark shifts of intersubband transitions in a step quantum well are observed for the first
time. The Stark shifts are∼ 8 and 7 meV at∼ 18 kV/cm for the 1→ 2 and 1→ 3 intersubband …