Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory

O 43.12: Talk

Tuesday, March 17, 2020, 13:15–13:30, WIL A317

Influence of number of grooves on spectral shape of grating-coupled surface plasmon polaritons — •Sven Stephan, Christoph Bennenhei, Christoph Lienau, and Martin Silies — Institute of Physics, Carl von Ossietzky Universität, Oldenburg

Surface plasmon polaritons (SPP) are evanescent waves that can propagate along metal-dielectric interfaces over mesoscopic distances. Since they can be used to confine light beyond the diffraction-limit of free-space light, SPPs can combine the high bandwidth of optics with the small feature size of electronics and are believed to enable all-optical circuitry [1]. A common way of converting light to SPPs is to use focused-ion beam written grating couplers in metal films. However, most models that investigate grating-coupling assume an infinitely extended grating, i.e. an infinite number of grooves and do not take into account a finite number of grooves [2, 3]. Here, we present a systematic study of the influence of the number of illuminated grooves, both for in- as well as outcoupling, on the spectrum of the generated SPP waves. Our experimental results enable for tailoring the spectral response of the grating coupler for ideal spectral selection of wavelengths and spectral bandwidth of the SPP, to suit experimental demands where specific spectral shapes are required.

[1] Surface-plasmon circuitry, T.W. Ebbesen et al., Physics Today, 61(5), 2008 [2] Physical origin of photonic energy gaps in the propagation of surface plasmons on gratings, W. L. Barnes et al., Phys. Rev. B, 54(9), 1996 [3] S. A. Maier, Plasmonics: Fundamentals and applications, Springer, 2007