Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.75: Poster

Thursday, March 29, 2007, 15:00–17:30, Poster A

Optimized design of plasmonic MSM photodetector — •Jurana Hetterich¹, Georg Bastian², Nikolai A. Gippius³, Sergei G. Tikhodeev³, Gero von Plessen⁴, and Uli Lemmer¹ — ¹Lichttechnisches Institut, Universität Karlsruhe, Kaiserstr. 12, 76131 Karlsruhe, Germany — ²Fachbereich Technik, Fachhochschule Trier, Schneidershof, 54293 Trier, Germany — ³A. M. Prokhorov General Physics Institute RAS, Vavilova 38, Moscow 119991, Russia — ⁴Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany

We present an optimized design for a plasmonic metal-semiconductor-metal (MSM) photodetector with interdigitated electrodes with subwavelength dimensions and a single GaInNAs quantum well as an absorbing layer. Our calculations show that the coupling between localized plasmons and waveguiding modes leads to a strong enhancement of the electromagnetic field near the metallic electrodes, which results in an increased absorption in the quantum well. This allows both high quantum efficiency and fast electrical response of the MSM photodetector. As the localized plasmons in 1D metallic gratings can be excited only by light polarized perpendicular to the slits (TM polarization) the photodetector is expected to be polarization sensitive. With a grating periodicity of 820 nm and electrode finger width of 460 nm a 16-fold increase in the absorption of TM-polarized light in the quantum well is achieved in comparison to a case without electrodes. First experimental results will be shown and compared with the simulation.