Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Plasmonics and Nanooptics
O 75.6: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Studies on the nonlinear optical properties of lithographically fabricated nanoantennas — •jiyong wang1,2, anke horneber1, pierre michel adam2, and dai zhang1 — 1Institut für Physikalische und Theoretische Chemie, Eberhard Karls Universität Tübingen, 72076 Tübingen, Deuschland — 2Laboratoire de Nanotechnologie et d'Instrumentation Optique, Universite de Technologie de Troyes, 10004 Troyes, France
Metallic nanostructures exhibit fascinating linear and nonlinear optical properties when they are excited by incident light. Localized surface plasmons (LSPs) generated by a collective oscillation of electrons in conduction band offer the possibility of enhancing and concentrating electrical field in a subwavelength volume, which enable the nanostructures to act similar to antennas in the microwave or radiowave regime.
In order to explore the dependence of nonlinear optical properties on the LSPs for nanoantennas and their potential applications in the field of enhanced spectroscopy, we fabricated nanoantennas with different geometrical parameters (shape, dimension and gap) and materials by electron beam lithography. These nanoantennas were firstly characterized by far field extinction spectroscopy, which reflects footprints of their LSPs resonances. The nonlinear optical signals including second harmonic generation and two photon photoluminescence were investigated using far-field confocal optical microscopy and scanning near-field optical microscopy. . Gap-, material-, and position-dependent nonlinear optical properties of these nanoantennas will be systematically compared.