Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Interaction with strong or short laser pulses III

A 33.6: Vortrag

Donnerstag, 3. März 2016, 12:30–12:45, f303

Highly nonlinear nano-plasma formation and EUV light generation in gas-filled plasmonic waveguides — •Murat Sivis, Frederik Busse, and Claus Ropers — 4th Physical Institute - Solids and Nanostructures, University of Göttingen, 37077 Göttingen

Plasmonic nanostructures offer new means to study nonlinear optical phenomena in highly confined light fields. Specifically, resonant nanoantennas and tapered hollow waveguides allow for an efficient strong-field excitation and ionization of gas atoms accompanied by extreme-ultraviolet (EUV) light generation. Contrary to initial studies reporting plasmon-enhanced coherent high-harmonic generation [1, 2], it was shown that incoherent fluorescence photons dominate the EUV radiation under such conditions [3, 4].

Here, we present a detailed study of atomic gas excitation and EUV light generation in tapered plasmonic waveguides. In addition to the EUV emission, we record and analyze both photoelectron and ion yields from these structures as a function of incident intensity and gas pressure. Together with the experimental findings, finite element calculations of the local field distributions in the waveguides provide a comprehensive picture of the underlying excitation mechanisms.
[1] S. Kim et al., Nature 453, 757(2008). [2] I.-Y. Park et al., Nat. Photon. 5, 677 (2011). [3] M. Sivis et al., Nature 485, E1 (2012). [4] M. Sivis and C. Ropers, Phys. Rev. Lett. 111, 085001 (2013).