Abstract
The cross-phase modulation (XPM) efficiency in new coupled double quantum wells (CDQWs) was examined. Since the XPM efficiency was enhanced under the resonant condition of interband transition (IBT), the new CDQWs were designed to control the IBT absorption edge wavelength (IBT-EW) while the intersubband transition (ISBT) wavelength was maintained at around the optical communication wavelength. By controlling the coupling strength between two wells and the bandgap energy of the wells, the new CDQWs can have a possibility of individual control of the IBT and ISBT wavelengths. In the new CDQWs, a high XPM efficiency close to 0.5 rad/pJ was observed; this value was three times higher than that observed in previous studies.
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