Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Structure, Fabrication and Characterization

O 23.7: Talk

Tuesday, March 17, 2015, 12:00–12:15, MA 043

Nanowire-film gap plasmon waveguides for spaser resonators — •Friedemann Gädeke, Günter Kewes, and Oliver Benson — AG Nano Optik, Institut für Physik, Humboldt-Universität zu Berlin

Surface plasmon amplification by stimulated emission of radiation (spaser) might be an essential part of future nano-photonic devices. Spasers are subwavelength sized light sources and could be used in quantum information technology or nano-lithography [1].

We report on numerical and experimental investigations on an ultra-compact resonator design for spasers. We use organic gain media in a waveguide which is formed by a gap between a gold film and a gold nanowire. The design follows Ref. [2] and [3] and includes emitter-free spacing layers between active medium and metal [4] which will be benefitial to achieve lower spasing thresholds. We optimize our design towards a well defined energy distribution in the gap and low propagation losses. We present a feasible fabrication technique based on relatively simple and quick methods like spin-coating, ellipsometry and stamping as well as first fluorescence studies.

[1] Stockman, M. I., Journal of Optics 12, 024004 (2010) [2] Oulton, R. F. et al., Nature 461, 629-632 (2009) [3] Russell, K. J. et al., Nature Photonics 6, 459-462 (2012) [4] Kewes, G. et al., Arxiv 1408.7054 (2014)