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Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Laser development and applications IV

Q 23.4: Vortrag

Dienstag, 18. März 2014, 14:45–15:00, DO26 207

Plasmon Resonance Tuning of a Single Gold Nanoparticle by Controlled Melting — •Alexander Kuhlicke1, Stefan Schietinger1, Christian Matyssek2, Kurt Busch2,3, and Oliver Benson11AG Nanooptik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin — 2AG Theoretische Optik & Photonik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin — 3Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin

Metallic nanoparticles support localized surface plasmons which concentrate electromagnetic energy in volumes much smaller than the wavelength of the incident light. At the resonance frequency of the electron oscillations in the metal, strong light absorption and scattering can be observed. Such ‘plasmonic nanoantennas’ can alter the fluorescence rates due to the field enhancement in the vicinity. For efficient coupling, the emitter’s transition energy should fit to the plasmon resonance, which depends not only on the dielectric properties of the particle and the surrounding medium but also on the size and the shape of the particle. We developed a method to control the shape of individual gold nanoparticles and thus to tune their plasmon resonance in situ simply by a focussed laser beam. The induced melting and shaping process changes the symmetry from spherical to prolate spheroidal which allows for the controlled tuning of the plasmon resonance only by adjusting the applied laser intensity. We present comprehensive experimental and theoretical analysis of the tuning process, which will be useful for the assembly of resonant nanoparticles and nanostructures.

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