Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 14: Heterostrukturen

HL 14.4: Vortrag

Freitag, 4. März 2005, 15:45–16:00, TU P-N229

TE- and TM-polarization resolved spectroscopy on quantum wells under normal incidence — •M. Schardt^1,2, A. Winkler^1,2, G. Rurimo², S. Quabis², S. Malzer^1,2, G. Leuchs², and G. H. Döhler^1,2 — ¹Institute of Technical Physics I — ²Max-Planck research group, Institute of Optics, Information and Photonics, University Erlangen-Nuremberg, Germany

We present TE- and TM-polarization resolved photocurrent measurements on quantum well pin diodes under normal incidence.
Usually, optical experiments performed in such a geometry yield information only about transitions involving in-plane (p_x− and p_y−) components of the hole wave functions because of the in-plane (TE-) polarization of the light. The lost information on transitions sensitive to the p_z components can be recovered by focussing a radially polarized laser beam through a microscope-objective with high numerical aperture (NA ≥ 0.9) [1]. With our setup, the electrical field vector at the focal tail has a significant component along the optical axis (TM-polarization!) which enables excitation of transitions sensitive to p_z components also. Experimental evidence of this feature has been performed by exploiting the selection rules for e-hh and e-lh transitions in a quantum well structure. We present a comparison of our recorded spectra with theoretical predictions obtained from simple geometric optics assumptions.

[1] S. Quabis et al., Optics Communications 179 (2000) 1-7