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Presents a study which discussed the impact of ionization rates of holes in Al[subx]Ga[sub1-x]Sb near x=0.06, where resonance impact ionization is expected. Results of measurement of impact ionization rates; Impact ionization probability at the spin-split-off band; Scattering rates of holes.

We report on bistable operations in a microcavity formed on an AlGaAs-based photonic crystal slab at telecommunication wavelengths. We designed the cavity to achieve a high quality (Q)-factor, while maintaining a small mode volume; this was accomplished by removal of a single air hole. The fabricated microcavity exhibited a resonant peak with a Q-factor of 1900 at 1548 nm. In nonlinear transmission measurement, when the input power was increased, a bistable characteristic which was dependent on the detuned wavelength from the resonance was observed. The bistability was considered to originate from thermal nonlinearity due to two-photon absorption [ABSTRACT FROM PUBLISHER]