Spectral lineshape in a polarization cascade

Shaul Mukamel, Danielle Grimbert

A. P. Kol'Chenko

The nonlinear spectral lineshape of gas absorption near the solid surface in the field of one travelling monochromatic wave is analyzed theoretically. A 'far' zone of distances to the surface, where coherent particle polarization is formed already after their collisions with surface but interparticle collisions in the gas are not yet significant, is considered. It is demonstrated that the narrow saturation sub-Doppler resonances may be appeared on the Doppler lineshape in this zone. These resonances having no analogues in the gas laser spectroscopy. A formation mechanism of such resonances is discussed.

Sergey G. Rautian

Xue-Fei Wu, Xiu-Ming Dou, Kun Ding +7 more

We report the observed photon bunching statistics of biexciton cascade emission at zero time delay in single quantum dots by second-order correlation function g (2) (τ) measurements under continuous wave excitation. It is found that the bunching phenomenon is independent of the biexciton binding energy when it varies from 0.59 meV to nearly zero. The photon bunching takes place when the exciton photon is not spectrally distinguishable from the biexciton photon, and either of them can trigger the 'start' in a Hanbury–Brown and Twiss setup. However, if the exciton energy is spectrally distinguishable from the biexciton, the photon statistics will become asymmetric and a cross-bunching lineshape can be obtained. The theoretical calculations based on a model of three-level rate-equation analysis are consistent with the result of g (2) (τ) correlation function measurements.

Osama M. Raisuddin, Suvranu De

Fabio Briscese, Nicolò Burzillà, Andrea Dosi