Fakultät für Physik




Efficient interaction of photons and optical emitters: from quantum optics to biophotonics

Prof. Dr. Vahid Sandoghdar (Max-Planck-Institut für die Physik des Lichts Erlangen)

Datum:  25.11.2013 17:15 Uhr – 18:30 Uhr

Ort: Hörsaal 2, Physik-Department der TUM, Garching

Recently, we showed that in the linear excitation regime, an atom can theoretically block a propagating light beam by up to 100% [1]. I will formulate this finding in a more general context of mode matching between the incident and scattered photons and present an overview of our experimental work on the efficient interaction of light and single organic molecules both in the near and far fields [2, 3]. We will see that at cryogenic temperatures, solid-state emitters can attenuate [2, 3], transmit, amplify [4] or phase-shift [5] a focused laser beam. Furthermore, I will report on the first direct long-distance communication of two optical emitters via single photons [6].

In the second part of this presentation, I will show that the same concepts in mode matching can lead to ultrasensitive detection, microscopy and tracking of biological nanoparticles such as viruses [7] and proteins [8]. In particular, I will discuss our new results in label-free single protein sensing and diffusion in lipid bilayers [9]. If time permits, I will also discuss strategies for the optimization of the interaction between photons and optical emitters via dielectric antennas [10, 11], plasmonic nanoantennas [12] and microresonators [13].


References[1] G. Zumofen, et al., Phys. Rev. Lett. 101, 180404 (2008), [2] I. Gerhardt, et al., Phys. Rev. Lett. 98, 033601 (2007), [3] G. Wrigge, et al., Nature Phys. 4, 60 (2008), [4] J. Hwang, et al., Nature 460, 76 (2009), [5] M. Pototschnig, et al. Phys. Rev. Lett. 107, 063001 (2011), [6] Y. Rezus, et al., Phys. Rev. Lett. 108, 093601 (2012), [7] P. Kukura, et al.,
 Nature Methods 6, 923 (2009), [8] M. Piliarik and V. Sandoghdar, submitted, [9] C-L Hsieh, S. Spindler, J. Ehrig, V. Sandoghdar, submitted, [10] K-G. Lee, et al., Nature Photonics 5, 166 (2011), [11] X-W. Chen, S. Götzinger, V. Sandoghdar, Opt. Lett. 36, 3545 (2011), [12] X-W. Chen, M. Agio, V. Sandoghdar, Phys. Rev. Lett. 108, 233001 (2012), [13] C. Toninelli, Y. Delley, T. Stöferle, A. Renn, S. Götzinger, and V. Sandoghdar, Appl. Phys. Lett. 97, 021107 (2010).