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  4. Stephan Götzinger

Prof. Stephan Götzinger

  • Professor
  • Room: A.3.230
  • Telephone: +49 9131 7133315
  • E-mail

My research is focused on solid-state quantum optics. In the past few years I have, for example, investigated methods to collect single photons with near-unity efficiency. Another emphasis is on techniques which can be used to enhance the interaction of a single photon with a single emitter.

2010

Quantum Interference of Tunably Indistinguishable Photons from Remote Organic Molecules

R. Lettow, Y. L. A. Rezus, A. Renn, G. Zumofen, E. Ikonen, Stephan Götzinger, Vahid Sandoghdar

Physical Review Letters 104 123605 (2010) | Journal

We demonstrate two-photon interference using two remote single molecules as bright solid-state sources of indistinguishable photons. By varying the transition frequency and spectral width of one molecule, we tune and explore the effect of photon distinguishability. We discuss future improvements on the brightness of single-photon beams, their integration by large numbers on chips, and the extension of our experimental scheme to coupling and entanglement of distant molecules.

A scanning microcavity for in situ control of single-molecule emission

C. Toninelli, Y. Delley, T. Stoeferle, A. Renn, Stephan Götzinger, Vahid Sandoghdar

Applied Physics Letters 97 021107 (2010) | Journal

We report on the fabrication and characterization of a scannable Fabry-Perot microcavity, consisting of a curved micromirror at the end of an optical fiber and a planar distributed Bragg reflector. Furthermore, we demonstrate the coupling of single organic molecules embedded in a thin film to well-defined resonator modes. We discuss the choice of cavity parameters that will allow sufficiently high Purcell factors for enhancing the zero-phonon transition between the vibrational ground levels of the electronic excited and ground states. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456559]

Efficient coupling of single photons to single plasmons

M. Celebrano, R. Lettow, P. Kukura, M. Agio, A. Renn, Stephan Götzinger, Vahid Sandoghdar

Optics Express 18 13829-13835 (2010) | Journal

We demonstrate strong coupling of single photons emitted by individual molecules at cryogenic and ambient conditions to individual nanoparticles. We provide images obtained both in transmission and reflection, where an efficiency greater than 55% was achieved in converting incident narrow-band photons to plasmon-polaritons (plasmons) of a silver nanoparticle. Our work paves the way to spectroscopy and microscopy of nano-objects with sub-shot noise beams of light and to triggered generation of single plasmons and electrons in a well-controlled manner. (C) 2010 Optical Society of America

Near-infrared single-photons from aligned molecules in ultrathin crystalline films at room temperature

C. Toninelli, K. Early, J. Bremi, A. Renn, Stephan Götzinger, Vahid Sandoghdar

Optics Express 18 6577-6582 (2010) | Journal

We investigate the optical properties of Dibenzoterrylene (DBT) molecules in a spin-coated crystalline film of anthracence. By performing single molecule studies, we show that the dipole moments of the DBT molecules are oriented parallel to the plane of the film. Despite a film thickness of only 20 nm, we observe an exceptional photostability at room temperature and photon count rates around 10 6 per second from a single molecule. These properties together with an emission wavelength around 800 nm make this system attractive for applications in nanophotonics and quantum optics. (C) 2010 Optical Society of America

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