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O: Fachverband Oberflächenphysik

O 49: Symposium Quantum Plasmonics (SYQP, jointly with HL, TT)

O 49.2: Hauptvortrag

Mittwoch, 13. März 2013, 15:30–16:00, H1

Deterministic quantum plasmonics with single nanodiamonds — •Serge Huant¹, Oriane Mollet¹, Aurelien Cuche^1,2, and Aurelien Drezet¹ — ¹Institut Neel, CNRS and Univ. Joseph Fourier, BP 166, 38042 Grenoble, France — ²CEMES, CNRS, BP 94347, 31055 Toulouse, France

Using an all-optical scheme, we can attach a single nanodiamond (ND) hosting a few nitrogen-vacancy (NV) color centers onto fiber tips for near-field scanning optical microscopy (NSOM). Illuminating the grafted ND with the substrate fiber and using the fluorescence generated by the ND as source of light achieves a genuine quantum scanning optical microscopy that operates at room temperature thanks to the exceptional photostability of the NVs. In addition, we have found that the ND-based active tip is capable of launching surface-plasmon-polaritons (SPPs) into gold films. Since the ND is a quantum source of light, a limited number of single plasmons are created, depending on the actual NV occupancy. A critical prerequisite for using these SPPs in future quantum protocols is that their propagation does not destroy their quantum coherence.

In this talk, we will review our demonstration of quantum SPP launching with a ND-based active tip. Then we will demonstrate that the quantum character of the light emanating from the ND is preserved by the plasmon mediation along the gold film. Our findings open the way to a deterministic quantum plasmonics, where a well-controlled number of quantum SPPs is launched at any freely chosen position in a plasmonic receptacle.