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Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.63: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Single-mode waveguide for evanescent broadband coupling — •Lars Liebermeister1, Niko Heinrichs1, Peter Fischer1, Martin Zeitlmair1, Florian Böhm1, Lukas Worthmann1, Harald Weinfurter1,2, and Markus Weber1,21Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching

Efficient coupling of single quantum emitters to single optical modes is of high importance for the realization of integrated optical devices for applications in quantum information science as well as in the field of sensing. Here we present the design and fabrication of a platform for on-chip experiments based on dielectric optical single-mode waveguides (Ta2O5 on SiO2). The design of the waveguide is optimized for broadband evanescent coupling to a single quantum emitter and low-loss single-mode photon guidance. Additionally, efficient coupling to standard single-mode fibers is achieved with inverted tapers.

Coupling to a quantum emitter placed on the waveguide could be as high as 34% for emission wavelengths from 600nm to 800nm. First test samples exhibit propagation loss below 1.8dB/mm and off-chip coupling to standard single mode fibers reached efficiency exceeding 57%. These results are promising for efficient coupling of emitters like the NV-center to a single optical mode and running multi-wavelength excitation and emission schemes in on-chip experiments.

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