Dresden 2011 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 12: Posters: New Technologies

BP 12.12: Poster

Montag, 14. März 2011, 17:15–20:00, P3

Interferometric nanoparticle tracking with few photons — •Dennis Müller and Rainer G. Ulbrich — IV. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

We report interferometric tracking of nanoparticles with subwavelength accuracy in the limit of low light intensities. With only few photons contributing to the far-field interferogram the ultimate accuracy of a position measurement which can be achieved from phase reconstruction is limited by shot noise of the detected photons. By means of Monte Carlo simulations we have studied the precision of interferometric tracking as a function of the number of contributing photons and compared it with other tracking methods. The results were experimentally confirmed by tracking a single gold nanosphere, which was immobilized and moved in a controlled way by a piezo actuator.