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HL: Fachverband Halbleiterphysik

HL 63: Group IV elements and compounds

HL 63.8: Vortrag

Donnerstag, 19. März 2015, 11:15–11:30, EW 015

A low-loss, broadband antenna for effcient photon collection from a coherent spin in diamond — •Daniel Riedel, Dominik Rohner, Marc Ganzhorn, Timo Kaldewey, Patrick Appel, Elke Neu, Richard J. Warburton, and Patrick Maletinsky — Departement of Physics University of Basel, Basel, Switzerland

Light extraction from emitters in high-index, solid-state hosts is intrinsically difficult, but key to performance of applications in quantum-sensing, -metrology or -computing. We present a novel solution to this problem in form of a broadband, metal-free, low-loss optical antenna giving highly directed output for such emitters [1].
We engineer our device around individual nitrogen vacancy (NV) electronic spins in thin (< 1 µm), single-crystalline diamond membranes. We demonstrate the functionality of our antenna by measuring the emission patterns for different diamond layer thicknesses. Our findings show excellent agreement with an analytical theory and confirm that the NV emission is channeled preferentially into a medium-angle cone (NA < 0.75) in one direction. For broadband (640-750 nm), single NV fluorescence we report photon count rates approaching one MHz. Importantly, our photonic structure preserves the high spin coherence of NVs in single-crystalline diamond (T₂ > 100 µs).
Our results pave the way for near-unity photon collection efficiencies and unprecedented detection rates for not only NV centers, but a broad class of quantum emitters in high-index, solid-state systems.
D. Riedel et al., accepted at Physical Review Applied