Abstract
We present a nonlocal local-field calculation of optical sum-frequency generation (SFG) in a quantum well (QW) associated with intersubband processes. The QW is positioned inside a microcavity and pumped by a strong light beam as one of the fundamental waves for the SFG. The third-order optical nonlinearity of the QW in connection with the strong field is included in the calculation of the sum-frequency (SF) conversion efficiency. From the microscopic Maxwell–Lorentz equation combined with light-induced linear and third-order nonlinear current densities, we solve the fundamental and SF local fields exactly. In turn we define the conversion efficiency of the SFG. For a GaAs/Al0.4Ga0.6As QW placed between vacuum and a GaAs/AlAs distributed Bragg reflector (DBR) followed by a GaAs prism, we calculate the SF energy reflection spectra for different values of the incident light intensity and the DBR period. The numerical results show that a significant enhancement of the SF conversion efficiency occurs when the DBR period and the input light intensity are optimally chosen. This is attributed to the cavity- and light-induced local-field enhancement in the QW system.
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