Physics – Condensed Matter – Materials Science
Scientific paper
2011-01-28
Physical Review B 83, 205207 (2011)
Physics
Condensed Matter
Materials Science
7 pages (2-column), 7 figures
Scientific paper
10.1103/PhysRevB.83.205207
Nonlinear light propagation in a single-mode micron-size waveguide made of semiconducting excitonic material has been theoretically studied in terms of exciton-polaritons by using an analysis based on macroscopic fields. When a light pulse is spectrally centered in the vicinity of the ground-state Wannier exciton resonance, it interacts with the medium nonlinearly. This optical cubic nonlinearity is caused by the repulsive exciton-exciton interactions in the semiconductor, and at resonance it is orders of magnitude larger than the Kerr nonlinearity (e.g., in silica). We demonstrate that a very strong and unconventional modulational instability takes place, which has not been previously reported. After reducing the problem to a single nonlinear Schr\"odinger-like equation, we also explore the formation of solitary waves both inside and outside the polaritonic gap and find evidence of spectral broadening. A realistic physical model of the excitonic waveguide structure is proposed.
Biancalana Fabio
Malzer Stefan
Smyrnov Oleksii A.
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