Regensburg 2007 – scientific programme

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BP: Fachverband Biologische Physik

BP 20: Novel Methods

BP 20.3: Talk

Wednesday, March 28, 2007, 18:00–18:15, H43

Surface Plasmon Excited Nanolight Sources — •Dominic Zerulla, Brian Ashall, and Michael Berndt — UCD Dublin, School of Physics, Dublin 4, Ireland

Presented here is a project to develop novel apertureless nanolight sources which would find applications in many innovative devices. In particular, they will be the basis of novel lightsources which will combine beyond diffraction limit resolution with a currently unattainable high photon flux. In brief, the creation of these sources is based on the phenomenon of Surface Plasmon excitation on complex nanostructures. The topographic design of the nanostructures creates a 3-dimensional highly focused electromagnetic field distribution.

The tailor-made structure arrays have been designed on the basis of our theoretical predictions and have been fabricated using e-beam lithography. The layout of the individual nanostructures is not necessarily rotationally symmetric but can have a threefold symmetry axis or even more complex symmetry. The nanostructure are arranged in form of an array.

The light emission and Surface Plasmon resonances from these arrays are currently been investigated in the far-field and the near-field. Additionally, an investigation into the polarisation dependence of the intensities of the diffracted patterns from the above mentioned nano-structured arrays will be discussed. The generation of these highly focused, controllable and localized electromagnetic fields will permit currently unattainable imaging resolution to drive advances in the critical biomedical sector.