Abstract
The reflection of a finite-duration optical pulse from a semi-infinite nonlocal medium for various additional boundary conditions (ABC's) is investigated theoretically. We have obtained explicit expressions for the amplitude and phase of the transient reflected field (local and nonlocal) and evaluated them numerically for different ABC's. We predict a damped oscillatory decay in transient reflectivity (after the pulse is cut off) due to relaxation processes which cause dephasing of emitted light on a scale longer than the cutoff time of the pulse. The effects of spatial dispersion for the reflected transients associated with the light pulse are important for the laser frequency at the vicinity of an exciton-polariton resonance. For various ABC's, for the cases of CdS and CuCl semiconductors, we find quantitative differences in the magnitude of the amplitude of the transient. This can be used to analyze different ABC's experimentally.
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