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O: Fachverband Oberflächenphysik

O 56: Plasmonics and nanooptics: Light-matter interaction, spectroscopy IV

O 56.2: Vortrag

Mittwoch, 14. März 2018, 10:45–11:00, MA 041

Second harmonic generation in fully symmetric gold nanostructures — •Julian Obermeier¹, Tzu-Yu Chen^2,3, Fan-Chen Lin⁴, Jer-Shing Huang⁵, Chen-Bin Huang^2,3, and Markus Lippitz¹ — ¹Experimental Physics III, University of Bayreuth — ²Institute of Photonics Technologies, National Tsing Hua University — ³International Intercollegiate PhD Program, National Tsing Hua University — ⁴Department of Chemistry, National Tsing Hua University — ⁵Leibniz Institute of Photonic Technology

Higher harmonics generation in single plasmonic nanostructures is widely observed. While the third harmonic can always be generated, second harmonic generation underlies special symmetry restrictions. For common plasmonic materials as gold and silver the cento-symmetric crystal structure forbids second harmonic generation in the electric dipole approximation for bulk material. Inversion symmetry can be broken by the shape of the nanostructure itself, i.e., L or V shapes. Until now this is the only known way to generate strong second harmonic signal from symmetric materials. We demonstrate an entirely new way to break the overall symmetry in structural and material fully symmetric nanostructures. The key idea is to offer an optical mode of broken symmetry in which the symmetric structure can emit. We will illustrate this effect and demonstrate experimental as well as numerical realizations.