Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 31: Plasmonics & Nanooptics II: SHG and Dielectric Properties (joint session O/CPP)
O 31.5: Talk
Tuesday, April 2, 2019, 15:00–15:15, H8
Symmetry-forbidden second-harmonic generation in a fully centro-symmetric plasmonic nanocircuit — •Julian Obermeier1, Tzu-Yu Chen2, Thorsten Schumacher1, Fan-Cheng Lin2, Jer-Shing Huang3,4,5, Chen-Bin Huang2,5, and Markus Lippitz1 — 1University of Bayreuth, Germany — 2National Tsing Hua University, Taiwan — 3Leibniz Institute of Photonic Technology, Germany — 4National Chiao Tung University, Taiwan — 5Research Center for Applied Sciences, Taiwan
Nonlinear optical frequency conversion on the nanoscale remains a challenge, but may pave the path towards multi-functional optical circuits. Surface plasmon fields are highly spatially confined near the metal/dielectric interface and exhibit giant field enhancement. These two attributes are invaluable for nonlinear optics with plasmons. However, second-harmonic generation in bulk is forbidden in centro-symmetric materials such as typical noble metals. Past efforts concentrated on the broken symmetry at the surface in combination with an asymmetric shape of the particle. We introduce a new way of breaking the symmetry by a propagating mode of a plasmonic waveguide, a two-wire transmission-line. We demonstrate that an optical mode of correct symmetry is sufficient to allow SHG even in centro-symmetric structures made of centro-symmetric material. This is a new degree of freedom for on-chip nonlinear signal processing in nanophotonics.