Title :
Ultrafast optical nonlinearity by virtual charge polarization in DC-biased quantum well structures
Author :
Yamanishi, Masamichi ; Kurosaki, Masami
Author_Institution :
Dept. of Phys. Electron., Hiroshima Univ., Japan
Abstract :
An optical nonlinearity due to virtual charge polarization in a quantum-well structure biased by a DC electric field is proposed and discussed. The switching time of the nonlinearity is expected to be extremely short, on the order of 100 fs. An effective degenerative four-wave chi /sup 3/ parameter is estimated to be 1.0*10/sup -9/ (esu) for a graded gap AlGaAs quantum well and a detuning energy of pump light, 35 meV. The nonlinearity is observable and quite useful for designing an all-optical and ultrafast optical gate.<>
Keywords :
nonlinear optics; optical bistability; semiconductor junctions; semiconductor superlattices; 100 fs; 35 meV; DC electric field; DC-biased quantum well structures; III-V semiconductor; all optical gate; detuning energy; effective degenerate four wave parameter; graded gap AlGaAs quantum well; pump light; switching time; ultrafast optical gate; ultrafast optical nonlinearity; virtual charge polarization; High speed optical techniques; Optical bistability; Optical devices; Optical feedback; Optical modulation; Optical polarization; Optical pumping; Parameter estimation; Ultrafast optics; Ultraviolet sources;
Journal_Title :
Quantum Electronics, IEEE Journal of
