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Plasmonics is the art of harnessing collective oscillations of electrons in metallic (nano)-structures for applications in quite diverse fields such as optoelectronics, biophysics or electrochemistry. Previously, we have established single metallic nanoparticle spectroscopy[1], investigated fundamental interactions of fluorophores with plasmons[2, 3], and established (single) nanoparticle biosensing [4-6].

1. Klar T., Perner M., Grosse S., Von Plessen G., Spirkl W., Feldmann J.: Surface-plasmon Resonances in Single Metallic Nanoparticles. Physical Review Letters 1998; 80(19): 4249-52.
2. Dulkeith E., Morteani A. C., Niedereichholz T., Klar T. A., Feldmann J., Levi S. A., Van Veggel F. C. J. M., Reinhoudt D. N., Möller M., Gittins D. I.: Fluorescence Quenching of Dye Molecules near Gold Nanoparticles: Radiative and Nonradiative Effects. Physical Review Letters 2002; 89(20): 203002.
3. Ringler M., Schwemer A., Wunderlich M., Nichtl A., Kürzinger K., Klar T. A., Feldmann J.: Shaping Emission Spectra of Fluorescent Molecules with Single Plasmonic Nanoresonators. Physical Review Letters 2008; 100: 203002.
4. Raschke G., Brogl S., Susha A. S., Rogach A. L., Klar T. A., Feldmann J., Fieres B., Petkov N., Bein T., Nichtl A., Kürzinger K.: Gold Nanoshells Improve Single Nanoparticle Molecular Sensors. Nano Letters 2004; 4: 1853-7.
5. Dondapati S. K., Sau T. K., Hrelescu C., Klar T. A., Stefani F. D., Feldmann J.: Label-free Biosensing Based on Single Gold Nanostars as Plasmonic Transducers. ACS Nano 2010; 4(11): 6318-22.
6. Stehr J., Hrelescu C., Sperling R., Raschke G., Wunderlich M., Nichtl A., Heindl D., Kürzinger K., Parak W. J., Klar T. A., Feldmann J.: Gold Nano-Stoves for Microsecond DNA Melting Analysis. Nano Letters 2008; 8(2): 619-23.

Currently, we are working on the following projects:

** Active Nanoplasmonics

This work is supported by the ERC via Starting Grant “Active NP”, (PI: T.A. Klar)

In Active NP, we investigate the physics of mixed materials comprising plasmonic nanostructures and active materials such as (laser)dye molecules and semiconductor quantum dots. The nano-plasmonic structures include particles of unusual shape such as sponges and we investigate both, single nanoparticle responses as well as extended aperiodic and periodic structures, frequently called metamaterials.

** Plasmonic/Organic Optoelectronic Devices

The OLED activities are supported by the Erasmus Mundus Mobility Project GATE and the
Organic Solar Cell activities are supported by the Austrian Energy Fund in the framework of “Energy Mission Austria” (PI: C. Hrelescu)

These activities are in close collaboration with the Linz Institute for Organic Solar Cells (LIOS), the Institute of Physical Chemistry (both: Prof. Dr. N. S. Sariciftci and Dr. M. C. Scharber), and with Profactor GmbH, Steyr.

** Gold Nanoparticles for Electrochemistry

Supported from core funds, we investigate the optical spectral response of biased metallic nanoparticles[7]. We find, that electrochemical reactions can be traced optically instead of electrically, sometimes even beyond the onset of oxygen evolution.

7. Dondapati S. K., Ludemann M., Müller R., Schwieger S., Schwemer A., Händel B., Kwiatkowski D., Djiango M., Runge E., Klar T. A.: Voltage-Induced Adsorbate Damping of Single Gold Nanorod Plasmons in Aqueous Solution. Nano Letters 2012; 12: 1247-52.