Microcavity effect in the optical intersubband absorption of a multiple-quantum-well structure

In a nonlocal semiclassical local-field approach, the linear optical intersubband absorption coefficient of a multiple-quantum-well (MQW) structure inside a microcavity is derived. It is shown that intersubband absorption spectra of the MQW structure are strongly dependent of the effective cavity length. When the cavity length is comparable to the wavelength of light, it is demonstrated that a notable splitting of the intersubband absorption line may occur for the MQW structure having a sufficient number of quantum wells.