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Dr. Jan Renger

  • Senior Scientist
  • Room: A.3.232
  • Telephone: +49 9131 7133341
  • E-mail

Tailoring the optical properties at the micro- and nanoscale is key to enable new experiments in the field of quantum optics and biophotonics. To this end, I use my strong background in numerical simulations as well as nano- and microfabrication techniques together with the expertise in spectroscopy, linear and nonlinear optics to enable and conduct experiments.

2015

Active Control of Surface Plasmon Waveguides with a Phase Change Material

Miquel Rudé, Robert E. Simpson, Romain Quidant, Valerio Pruneri, Jan Renger

ACS Photonics 2 669-674 (2015) | Journal

The ability to manipulate light propagation at the nanoscale is of vital importance for future integrated photonic circuits. In this work we exploit the high contrast in the optical properties of the phase change material Ge2Sb2Te5 to control the propagation of surface plasmon polaritons at a Au/SiO2 interface. Using grating couplers, normally incident light at lambda = 1.55 μm is converted into propagating surface plasmons on a Au waveguide. Single laser pulses (lambda = 975 nm) are applied to a thin film of Ge2Sb2Te5 placed on top of the device, which, upon transition from its amorphous to crystalline structural phase, dramatically increases both its refractive index and absorption coefficient, thus inhibiting propagation of the plasmonic mode. This effect is investigated for different interaction lengths between the phase change material and the Au waveguide, and contrast values in the transmitted intensity up to several tens of percents are demonstrated.

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