Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Photonics I

Q 54.4: Talk

Friday, March 21, 2014, 11:30–11:45, UDL HS3038

Fast optical modulation of the fluorescence from a single nitrogen-vacancy centre — •Michael Geiselmann¹, Renaud Marty¹, Jan Renger¹, Javier Garcia de Abajo^{1 , 2}, and Romain Quidant^{1 , 2} — ¹ICFO - The Institute of Photonic Sciences, Barcelona (Spain) — ²ICREA - Institució Catalana de Recerca I Estudis Avançats, Barcelona (Spain)

We demonstrate that a single nitrogen-vacancy centre at room temperature can operate as an optical switch under non-resonant continuous-wave illumination. We show an optical modulation of more than 80% and a time response faster than 100 ns in the green-laser-driven fluorescence signal, which we control through an independent near-infrared gating laser. Our study indicates that the near-infrared laser triggers a fast-decay channel of the nitrogen-vacancy mediated by promotion of the excited state to a dark band. In a second step, we use plasmon based optical tweezers to deterministically locate single nano-diamonds in the hot spot of plasmonic antennas. We demonstrate that the hybrid system formed by a single nitrogen-vacancy coupled to a gold gap antenna, resonant in the NIR, enhances the modulation effect described above with modulation intensities for the NIR of only a few mW.