Cryogenic packaging of nanophotonic devices with a low coupling loss < 1 dB
Abstract
Robust, low-loss photonic packaging of on-chip nanophotonic circuits is a key enabling technology for the deployment of integrated photonics in a variety of classical and quantum technologies including optical communications and quantum communications, sensing, and transduction. To date, no process has been established that enables permanent, broadband, and cryogenically-compatible coupling with sub-dB losses from optical fibers to nanophotonic circuits. Here we report a technique for reproducibly generating a permanently packaged interface between a tapered optical fiber and nanophotonic devices with a record-low coupling loss < 1 dB per facet at near-infrared wavelengths (~730 nm) that remains stable from 300 K to 30 mK. We further demonstrate the compatibility of this technique with etched lithium niobate on insulator waveguides. The technique lifts performance limitations imposed by scattering as light transfers between photonic devices and optical fibers, paving the way for scalable integration of photonic technologies at both room and cryogenic temperatures.
Keywords
Cite
@article{arxiv.2306.09894,
title = {Cryogenic packaging of nanophotonic devices with a low coupling loss < 1 dB},
author = {Beibei Zeng and Chawina De-Eknamkul and Daniel Assumpcao and Dylan Renaud and Zhuoxian Wang and Daniel Riedel and Jeonghoon Ha and Carsten Robens and David Levonian and Mikhail Lukin and Ralf Riedinger and Mihir Bhaskar and Denis Sukachev and Marko Loncar and Bart Machielse},
journal= {arXiv preprint arXiv:2306.09894},
year = {2023}
}