Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Nano-Optics (Single Quantum Emitters) III

Q 55.3: Vortrag

Donnerstag, 14. März 2019, 14:45–15:00, S SR 112 Maschb.

A Planar Optical Antenna for Color Centers in Diamond — •Philipp Fuchs, Thomas Jung, and Christoph Becher — Universität des Saarlandes, Fakultät NT - Fachrichtung Physik, Campus E2.6, 66123 Saarbrücken

Color centers in diamond, e.g. the nitrogen (NV), silicon (SiV) or very recently the tin (SnV) vacancy center, have become very promising candidates for the implementation of stationary qubits or bright single photon sources. One of the most challenging problems when working with these defects is the low rate of collectible photoluminescence (PL) out of unstructured diamond films. Because of total internal reflection at the diamond-air-interface, this problem cannot be solved simply by using high NA objectives and the collectible PL rate is limited to a few percent of the total PL rate. Here, we present our latest progress on fabricating a planar antenna design [1] to increase the collectible PL rate by an order of magnitude compared to unstructured diamond films. The antenna design is based on a thin diamond membrane (< 200 nm), fabricated in commercially available, high purity diamond material via reactive ion etching. Combining this thin membrane with metallic layers enables the creation of tailored radiation patterns, leading to a high directivity and thereby a high collectible PL rate with only small variations for emitters at different positions or depths in the diamond film.

[1] H. Galal, M. Agio, Opt. Mater. Express 7, 1634-1646 (2017)