Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 81: Enabling Technologies: Quantum Materials

FM 81.3: Talk

Thursday, September 26, 2019, 14:45–15:00, 3042

Scalable production of optical elements for photonics with quantum emitters — •Fiammetta Sardi, Thomas Kornher, Roman Kolesov, Ferdinand Schiller, and Jörg Wrachtrup — 3rd Physics Institute, University of Stuttgart, Stuttgart, Germany

We show different methods to enhance the emission of quantum emitters, such as V_Si in SiC and rare-earth ions in LiNbO₃. We demonstrate a scalable way of manufacturing solid-immersion lenses (SILs) on 4H-silicon carbide (SiC) to enhance collection efficiency of fluorescence of silicon vacancy defect centers. The fabrication process is based on thermal reflow of a lithographically defined photoresist mask followed by high selectivity reactive ion etching. The procedure results in SILs with high effective NA. The fluorescence collection efficiency enhancement of 3.4 times is confirmed by confocal microscopy of individual V_Si centers. We show optical measurements of thin-film LiNbO₃ based optical microdisk resonators. Structured with scalable fabrication techniques, we achieved Q-factors of 10⁵ with mode volume of 25· (λ/n)³, providing the possibility of ∼ 300 Purcell enhancement of resonant emitters within these structures. Owing to electro-optic properties of lithium niobate, the resonators are electrically tunable over the range of 300 GHz. Once activated with rare-earth ions, lithium niobate resonators present a flexible and scalable platform for cavity QED with single rare-earth emitters.