Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Plasmonics and nanooptics: Applications and other aspects II

O 66.8: Talk

Wednesday, March 14, 2018, 17:00–17:15, MA 041

Applications of plasmonic standing waves — Petr Dvořák, Michal Kvapil, Zoltán Édes, Petr Bouchal, Tomáš Šamořil, •Vlastimil Křápek, and Tomáš Šikola — CEITEC, Brno University of Technology, Purkyňova 123, CZ 61200 Brno, Czech Republic

We demonstrate formation of plasmonic standing waves on top of a gold layer. Subwavelength slits fabricated in the gold layer by focused ion beam milling serve as sources of propagating surface-plasmon-polariton waves when illuminated from bottom. By proper arrangement of the slits it is possible to form a desired interference pattern, which is then imaged using scanning near-field optical microscopy (SNOM).

We demonstrate several applications of the plasmonic standing waves. (1) We performed spectroscopic measurements of plasmon interference patterns by an aperture-type SNOM setup equipped with a supercontinuum laser and a polarizer. The series of wavelength- and polarization-resolved measurements, together with results of numerical simulations, then allowed us to identify the role of individual near-field components (in-plane, out-of-plane) in formation of SNOM images [1,2]. (2) We demonstrate (plasmo)luminescence of optical emitters located near the interference maxima. (3) Using spatial light modulator to modify the phase of the wave illuminating the slits we are able to reconstruct the phase of the plasmonic standing wave.

[1] P. Dvořák et al., Nano Lett 13, 2558 (2013).

[2] P. Dvořák et al., Opt. Express 25, 16560 (2017).