Bragg diffraction of microcavity polaritons by a surface acoustic wave

Details Bragg diffraction of microcavity polaritons by a surface acoustic wave Bragg diffraction of microcavity polaritons by a surface acoustic wave

2005-03-23

arxiv.org/abs/cond-mat/0503583v1

Phys. Rev. Lett. 94, 226406 (2005)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.226406

Bragg scattering of polaritons by a coherent acoustic wave is mediated and strongly enhanced by the relevant exciton states resonant with the acoustic and optic fields simultaneously. In this case, in sharp contrast with conventional acousto-optics, the resonantly enhanced Bragg spectra reveal the multiple orders of diffracted light, i.e., a Brillouin band structure of parametrically driven polaritons can be directly visualized. We analyze the above scheme for polaritons in (GaAs) semiconductor microcavities driven by a surface acoustic wave (SAW) and show that for realistic values of the SAW, $\nu_{\rm SAW} = 1$ GHz and $I_{\rm ac} \lesssim 100$ W/cm$^2$, the main acoustically-induced band gap in the polariton spectrum can be as large as $\Delta^{\rm MC}_{\rm ac} \simeq 0.6$ meV, and the Bragg replicas up to $n=3$ can be observed.

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