Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 75: Plasmonics and Nanooptics

O 75.3: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Hybrid quantum dot nanoantenna systems: fabrication and characterization — •Manuel Peter, Cody Friesen, and Stefan Linden — Physikalisches Institut, Universität Bonn, Nußallee 12, 53115 Bonn, Germany

This poster will provide an overview of the fabrication and characterization methods we use to investigate hybrid quantum dot nanoantenna systems. We present a two-step electron lithography process for the reliable positioning of colloidal quantum dots in the vicinity of plasmonic nanoantennas with sub-50nm spatial accuracy and a first experiments with such structures In the first lithography step, gold nanoantennas are fabricated with spectral features at the emission wavelength of the used quantum dots (λ=780 nm). Following this, a second layer of PMMA is deposited on the sample. Then a template is written with the electron beam to define the positions for the colloidal quantum dots. After development, the surface of the substrate as well as that of the quantum dots are chemically modified such that a linker molecule can bind the quantum dots to the predefined spots. After removing the PMMA mask, we obtain hybrid nanostructures composed of gold nanoparticles and quantum dots. With our fabrication method, we are able to precisely control all geometrical parameters of the hybrid nanostructures. In this contribution we show an example of a successful coupling of quantum dots and rod nanoantennas. By examining the polarisation of the fluorescence light of the structure, we could confirm that the quantum dots are still functional and interact with the nanoantenna.