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Q: Fachverband Quantenoptik und Photonik

Q 23: Photonik II

Q 23.5: Vortrag

Dienstag, 11. März 2008, 17:30–17:45, 2B/C

Controlled coupling of emitters to SiN photonic crystal cavities — •Johannes Stingl¹, Michael Barth¹, Josef Kouba², Bernd Löchel², and Oliver Benson¹ — ¹Nano-Optik, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin — ²Anwenderzentrum für Mikrotechnik, BESSY GmbH, Albert-Einstein-Str. 15, 12489 Berlin

The controlled coupling of emitters to photonic crystal (PC) cavities is a crucial issue for future applications of integrated PC structures. Here we present a versatile approach to this problem based on the manipulation of nanoscopic particles on the PC surface by scanning probe techniques. This method allows a deterministic and reversible coupling of one or more light emitting particles to the cavities after the fabrication of the samples. We apply this approach to couple diamond nanocrystals containing NV color centers to SiN PC cavities. These cavities operate in the visible wavelength range between 550 nm and 800 nm and are therefore ideally suited to manipulate the emission properties of a broad variety of emitters in the visible. Despite the relatively small refractive index of SiN (n = 2.0) the cavity quality factors have been optimized to values of up to 1500 by carefully designing the cavity geometry. Our experimental studies are accompanied by numerical simulations investigating the influence of nanoscopic particles on the optical properties of PC cavities. For the system studied here, the impact on the resonance frequency and quality factor turns out to be negligible for particle diameters well below 100 nm.