Abbreviated Journal Title
Phys. Rev. B
ELECTRON SCATTERING RATES; OPTICAL NONLINEARITIES; SEMICONDUCTORS; INAS; SPECTROSCOPY; COEFFICIENTS; REFRACTION; DEPENDENCE; 2-PHOTON; PLASMAS; Physics, Condensed Matter
An experimental demonstration of a dynamic decrease of the optical band gap of bulk n-InSb induced by picosecond, midinfrared laser pulses is reported. This occurs as a result of laser heating of the quiescent electron distribution by free-carrier absorption. The hot electrons vacate low-energy states near the conduction;band minimum,unblocking terminal states for two-photon absorption across the band gap. This ''leakage'' two-photon absorption is detected as a consequence of changes to the refractive index and absorption coefficient of the semiconductor caused by photocarriers. The onset of dynamic band unblocking agrees with a calculation of laser-induced electron heating.
Physical Review B
Hasselbeck, M. P.; Stryland, E. W.; and Sheik-Bahae, M., "Dynamic Band Unblocking And Leakage Two-Photon Absorption In Insb" (1997). Faculty Bibliography 1990s. 1939.