Regensburg 2010 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 34: Posters: New Technologies
BP 34.3: Poster
Donnerstag, 25. März 2010, 17:15–20:00, Poster B2
Phase estimation from interferograms with few photons — •Dennis Müller1, Thomas Hotz2, and Rainer G. Ulbrich1 — 1IV. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Institut für Mathematische Stochastik, 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. We have studied the precision of such a phase estimation, based on the maximum likelihood method, for different experimental configurations. Its dependence on the form of the interference pattern, the number and relative position of detection channels, and the total number of detected photons has been analyzed.