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HL: Fachverband Halbleiterphysik

HL 90: Graphene: Transport incl. Spin Physics and Magnetic Fields II

HL 90.1: Vortrag

Donnerstag, 29. März 2012, 17:00–17:15, ER 270

Launching surface plasmons on a metal/dielectric interface by emission from graphene — •Matthias Handloser¹, Sebastian Böcklein¹, Jürgen Kraus², Sebastian Günther², and Achim Hartschuh¹ — ¹Department Chemie und CeNS, LMU, München, Germany — ²Department Chemie, TUM, München, Germany

Graphene could eventually play an important role in photonics and optoelectronics due to its particular physical properties. We report on the excitation of propagating surface plasmons in thin metal films launched by photoexcited graphene. Graphene was deposited on a thin dielectric spacer layer on top of a thin metal film. Broadband non- linear photoluminescence (PL) of graphene [1,2] created by femtosecond pulsed excitation at 800 nm launches surface plasmons that are detected via leakage radiation microscopy [3]. Coupling to plasmons almost completely reshapes the emission both spatially and with respect to polarization as compared to graphene on a dielectric substrate. The angular dependence of plasmon coupled emission is used to map the dispersion relation of surface plasmons from 450-1000 nm. We further investigate the role of local defects and graphene edges on the emission characteristics. [1] R.J. Stöhr, et. al., Phys. Rev. B 82, 121408(R) (2010) [2] W-T Liu, et. al., Phys. Rev. B 82, 081408(R) (2010) [3] B. Hecht, et.al., Phys. Rev. Lett. 77,1889 (1996)