Stuttgart 2012 – wissenschaftliches Programm
Q 65.2: Hauptvortrag
Freitag, 16. März 2012, 14:30–15:00, V47.01
Optical Far-Field Addressing of Single Spins Beyond the Diffraction Limit at Enhanced Collection Efficency — •Dominik Wildanger1, Jero Maze2, Benno Koberstein-Schwarz1, Jan Meijer3, Sébastien Pezzagna3, Brian Patton4, Jason Smith4, and Stefan Hell1 — 1MPI for Biophysical Chemistry, Göttingen, GER — 2PUC, Santiago, Chile — 3Ruhr-Universität, Bochum, GER — 4University of Oxford, Oxford, UK
The electron spin associated with charged nitrogen-vacancy (NV) centres in diamond is optically addressable, because it can be polarised via an optical excitation, while its spin information is encoded in its fluorescence signal and can be read-out by using a fluorescence microscope. Till recently fluorescence microscopy was limited by diffraction and thus the spins of close-by NV- centres could not be addressed individually. Today techniques are available to fundamentally overcome the diffraction limit in fluorescence microscopy and some of them could be successfully applied on the NV- centre.
Here we show how to address single electron spins in diamond with single digit nanometre resolution by combining STED (Stimulated Emission Depletion) with ODMR (Optically Detectable Magnetic Resonance) techniques. Furthermore we overcome the limitations on fluorescence efficiency and focus quality caused by the high index of refraction of diamond by employing a solid immersion lens (SIL). We demonstrate that SIL enhanced STED-ODMR provides a spin addressing resolution potential of 1.6 nm. Concurrently the collection efficiency is increased by a factor of 5.