Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.27: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

Local Field Enhancement in Nano-Slit Arrays for Nonlinear THz Studies — •Thomas Rittmann1,2, Zhiren Zheng1, Scott Dhuey3, Stefano Cabrini3, Jan Heye Buss1, and Robert A. Kaindl11Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA — 24th Physical Institute, Georg-August-University, Göttingen, Germany — 3Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, USA

Nanoscale slit arrays in thin metal films act as strong field enhancers at terahertz (THz) frequencies while simultaneously retaining extraordinary optical transmission [1,2]. When driven with ultrashort THz pulses, this enables novel nonlinear THz studies of quantum materials [3]. We report time-domain THz spectroscopy of gold nano-slit arrays on single crystal quartz substrates for several slit widths down to 70 nm and for variable periodicities up to 50 um.

Besides confirming the general dependency of the field enhancement on inverse slit width and frequency, we observe its stagnation below a periodicity-dependent saturation frequency that results from spatio-temporal charge dynamics. The results are consistent with our numerical finite elements analysis and yield essential figures of merit for optimizing future nonlinear THz studies.

[1] M.A. Seo, et al. Nat. Photon. 22, 152-156 (2009).

[2] M. Shalaby, et al. Appl. Phys. Lett. 99, 041110 (2011).

[3] Z. J. Thompson, et al. Nano Lett. 15, 5893 (2015).

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