Related papers: Ion trap on borosilicate substrate with integrated femtosecond-laser-written waveguide

Ion trap on borosilicate substrate with integrated femtosecond-laser-written waveguide

URL: http://arxiv.org/abs/2608.13207v1
Date: Thu, 13 Aug 2026 13:09:16 GMT
Title: Ion trap on borosilicate substrate with integrated femtosecond-laser-written waveguide
Abstract summary: We present an ion-trap platform on borosilicate glass with an integrated femto-second-laser-written waveguide for on-chip light delivery.<n>We engineer single-mode low-loss guidance at 729 nm with tunable mode-field diameter and achieve low-loss curved waveguides down to a radius of curvature of 6 mm.<n>We validate the platform in a cryogenic trapped-ion system with $40$Ca$+$, demonstrating trapping, shuttling the ion to a zone in front of the waveguide, and coherent operations driven by 729 nm light delivered through the integrated waveguide
Score: 29.29675117876118
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We present an ion-trap platform on borosilicate glass with an integrated femtosecond-laser-written waveguide for on-chip light delivery. The optical layer is physically separated from the electrode substrate and bonded atop the trap, remaining compatible with silicon-based integration. We engineer single-mode low-loss guidance at 729 nm with tunable mode-field diameter and achieve low-loss curved waveguides down to a radius of curvature of 6 mm. We also extend single-mode operation to a wavelength of 405 nm. The fabrication process is compatible with the industrial fabrication of a single-metal-layer surface-electrode trap, including active fiber alignment and bonding. We validate the platform in a cryogenic trapped-ion system with $^{40}$Ca$^+$, demonstrating trapping, shuttling the ion to a zone in front of the waveguide, and coherent operations driven by 729 nm light delivered through the integrated waveguide. We characterize the effect of the exposed dielectric on the ion and measure stray electric fields that show slow drift at a timescale of hours. The architecture is compatible with hybrid micro-optics (e.g. pick-and-place lenses) to realize single ion addressing and provides a robust, scalable route to integrated light delivery for trapped-ion devices.

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