Optical Nonlinearties due to the Dipole-dipole Interactions in Two Coupled Quantum Dots

Lienau, Unold, Müller +2 more

Ju-Song Ryom, Gang-Yong Ri, Nam-Chol Kim +3 more

K. C. Je, Kwangseuk Kyhm

We have considered optical nonlinearities of coupled quantum dots theoretically, where an exciton dipole-dipole interaction is mediated between the adjacent large and small quantum dots. For increasing a pump pulse area in resonance with the large quantum dot exciton the induced nonlinear refractive index of the small quantum dot exciton has been obtained. As the exciton dipole-dipole interaction depends on the relative orientation of two exciton dipoles, the optical nonlinearities for the directions parallel and perpendicular to the coupling axis of the two quantum dots are compared. The directional imbalance of optical nonlinearities in coupled quantum dots can be utilized for a polarization phase modulator by controlling a pump pulse area and propagation length.

Victor Bondarenko, Yang Zhao

Christoph Lienau

We report the first time-resolved study of the nonlinear optical response of two dipole-coupled GaAs quantum dots, For resonant excitation of one dot, Rabi oscillations are observed in the nonlinear response of the second dot.

Julio R. Gea-Banacloche, Mambwe Mumba, Min Xiao

We explore the possibility of using pairs of quantum dots coupled by the dipole-dipole interaction as effective three- or four-level systems whose transmission for an optical beam at some frequency may be switched on or off using a second optical beam (electromagnetically induced transparency). We conclude that the characteristic interaction strengths and decay rates should allow for a demonstration of this effect in molecular beam epitaxy-grown bilayer $\mathrm{In}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ quantum dot structures.