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HL: Fachverband Halbleiterphysik

HL 52: Optical properties & Photonic crystals

HL 52.4: Vortrag

Freitag, 16. März 2018, 10:15–10:30, EW 201

Microscopic theory of two-photon absorption and stimulated emission in direct-gap semiconductors — •Wolf-Rüdiger Hannes and Torsten Meier — Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

Two-photon absorption (TPA) rates in semiconductors are analyzed within a simple two-band model. The light-matter interaction is treated non-perturbatively using the semiconductor Bloch-equations extended by the intraband accelaration [1], which is shown to cause a significant enhancement of the χ⁽³⁾ nonlinear response as compared to the two-photon transition rate from second-order perturbation theory. [2] The enhancement is particularly strong for widely-nondegenerate signal and idler photons. Our results are in agreement with experimental spectra for both TPA [3] and stimulated two-photon emission. [4]

[1] H. T. Duc, T. Meier, and S. W. Koch, Phys. Rev. Lett. 95, 086606 (2005); E. Sternemann, T. Jostmeier, C. Ruppert, H. T. Duc, T. Meier, and M. Betz, Phys. Rev. B 88, 165204 (2013)
[2] M. Sheik-Bahae, D. C. Hutchings, D. J. Hagan, and E. W. Van Stryland, IEEE Journal of Quantum Electronics 27, 1296 (1991).
[3] C. M. Cirloganu, L. A. Padilha, D. A. Fishman, S. Webster, D. J. Hagan, and E. W. Van Stryland, Opt. Express 19, 22951 (2011).
[4] M. Reichert, A. L. Smirl, G. Salamo, D. J. Hagan, and E. W. Van Stryland, Phys. Rev. Lett. 117, 073602 (2016)