Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 93: Poster Session: Metal-Semiconductor Hybrid Systems, Plasmonic Systems / Photonic Crystals / Carbon: Diamond & CNT / Quantum Information Systems
HL 93.2: Poster
Thursday, March 29, 2012, 16:00–19:00, Poster D
Fabrication of plasmonic nanoantenna/nanocrystal hybrid structures — •Heiko Linnenbank1,2, Stephan Irsen2, and Stefan Linden1 — 1Physikalisches Institut Universität Bonn, 53115 Bonn, Germany — 2Forschungszentrum caesar, 53175 Bonn , Germany
Plasmonic nanoantennas are known for their ability to focus visible and near infrared light far beyond the diffraction limit. The intensity in the nano foscus can exceed the intensity of the incident light field by orders of magnitude. Our aim is to combine this property with the second order nonlinear response of, e.g., nanocrystaline barium titanate or lithium niobate in order to achieve resonant second harmonic generation or optical parametric oscillation. A big challenge for the experimental realization of such a nanoantenna / nanoparticel hybrid structure is the controlled placement of the two components relative to each other.
To overcome this issue, we use a two step electron-beam lithography scheme, where in the first lithography step the antennas are fabricated by a standard metal lift-off technique. In the second lithography, we create holes in a PMMA resist layer with a well defined diameter at the desired positions of the nanoparticles. Afterwards, the sample is immersed in a nanoparticle solution and slowly extracted. Convective assembly leads to the exclusive deposition of the nanoparticles in the predefined holes. With this technique the precision of the placement is in the order of the diameter of the nanoparticel and we are able to produce multiple arrays of thousands of structures in a feasible time.