Seminar on 14 March 2019

Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Prague
Anisotropy and polarization dependence of multiphoton carrier excitation in diamond
at 13:00 in Seminar room F052

Anisotropy of multiphoton carrier generation in crystalline IIa diamond and its dependence on polarization state of excitation light (near-infrared few-cycle laser pulses) is investigated using photoluminescence and nonlinear absorption measurements. We observe anisotropy between multiphoton transition rates for light linearly polarized along <100> and <110> crystallographic directions of diamond and a strong intensity-dependent decrease of the transition rate for circularly polarized light. Measured results are compared with numerical simulations using time-dependent density functional theory and with an analytical model assuming a parabolic two-band system and the Houston function as the time-dependent wave function of the valence and conduction bands.