Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.51: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Ultra-bright and compact fibre coupled single photon source based on a defect centre in diamond using a solid immersion lens — •Friedemann Gädeke, Tim Schröder, and Oliver Benson — AG Nano Optics, Institut für Physik, Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin
Single photons are fundamental elements for quantum information technologies such as quantum cryptography, quantum information storage and optical quantum computing. Colour centres in diamond have proven to be stable single photon sources and thus essential components for reliable and integrated quantum information technology. A key requirement for such applications is a large photon flux and a high efficiency. We present an ultra bright and very compact single photon source based on nitrogen-vacancy defect centres in nanodiamonds. To increase the photon flux we used a hemispheric solid immersion lens made of ZrO2. The nanodiamonds were spin-coated on the flat surface of the solid immersion lens. We found stable count rates of up to 853 kcts/s and have access to more than 100 defect centres with count rates between 400 kcts/s and 500 kcts/s. We also found a blinking defect centre with a count rate of 2.4 Mcts/s for time intervals of several ten seconds at saturation intensity. At pulsed excitation with 10 MHz we got count rates of up to 221 kcts/s indicating a detection efficiency of 2.2 %. For flexible operation we intend to integrate excitation, collection and fibre coupling into a very compact device with a size of about 30 cm x 11 cm x 5 cm.