Condensed Matter Physics Seminar

Prof. Jan Wiersig, Magdeburg University

Friday 12 September 2014, 1500-1600
C1 Physics Building

Enhancing the sensitivity of microcavity sensors by using exceptional points

In recent experiments it has been demonstrated that optical microcavities can exhibit so-called exceptional points in parameter space, which are degeneracies in open systems where at least two resonant frequencies and the corresponding eigenmodes coalesce. In whispering-gallery cavities exceptional points are related to asymmetric backscattering between clockwise and counterclockwise traveling waves. We propose here to exploit these unconventional degeneracies for single-particle detection. Numerical and analytical calculations show that this has great potential for enhanced sensitivity provided that one is able to measure both the frequency splitting as well as the linewidth splitting.