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Characterization of grating couplers for 40Ca+ based integrated surface ion traps

Kentaro Furusawa, Kazuhiro Hayasaka, Issei Watanabe, Norihiko Sekine, U. Tanaka

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We report fabrication and characterization of grating couplers designed for 40Ca+ based planar surface traps. The wavelengths include 866, 854 and 729 nm and focusing at 100 um from the surface is demonstrated.
DOI
10.1364/cleo_at.2024.jw2a.99

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Conventional ion traps rely on bulky free-space optics or integration of grating couplers under the electrodes. The grating couplers are narrow-band components, necessitating four different couplers, each individually aligned, focused, and routed. This work presents a single waveguide with a broadband 45° angled mirror acting as an antenna. This structure demonstrated optical coupling from 422 nm to 1092 nm, suitable for Sr+ ion trap systems, with a gain of up to 15.51 to 16.59 dB. The broadband response demonstrated here helps to replace the commonly used four grating couplers and feed waveguides with a single set.
We have fabricated and characterized laser-ablated micromirrors on fused silica substrates for constructing stable Fabry–Perot optical cavities. We highlight several design features which allow these cavities to have lengths in the 250–300 μm range and be integrated directly with surface ion traps. We present a method to calculate the optical mode shape and losses of these micromirror cavities as functions of cavity length and mirror shape, and confirm that our simulation model is in good agreement with experimental measurements of the intracavity optical mode at a test wavelength of 780 nm. We have designed and tested a mechanical setup for dampening vibrations and stabilizing the cavity length, and explore applications for these cavities as efficient single-photon sources when combined with trapped Yb171+ ions.