---
_id: '66877'
abstract:
- lang: eng
  text: Integrated photon-pair sources, providing scalability solutions, are crucial
    for large-scale realizations of quantum photonic technologies. Their traditional
    fabrication techniques, such as etching, are often complex, require long development
    cycles, and are resource inefficient in case of fabrication imperfections or failures.
    The two-photon polymerization (2PP) technique can offer a rapid, efficient, and
    reproducible alternative for the fabrication of integrated photonic devices. Here,
    we demonstrate an integrated photon-pair source based on a 2PP-defined strip-loaded
    waveguide on a periodically poled thin-film lithium niobate (TFLN) platform. The
    device generates photon pairs through type-II spontaneous parametric down-conversion
    (SPDC), employing first-order quasi-phase matching (QPM) with TM-polarized excitation
    light. The device achieves an on-chip pair generation rate of 4.357 MHz and a
    coincidence-to-accidental ratio (CAR) of ∼404. To prove the flexibility and versatility
    of the fabrication technique, the waveguides were erased from the LN substrate
    and reprinted, reaching comparable performance. This work demonstrates the potential
    of 2PP as a rapid production technique for high-performance integrated photon-pair
    sources, offering a practical solution to the limitations of traditional fabrication
    techniques and showcasing both reproducibility of the fabrication and the reusability
    of the substrate.
article_number: '29244'
article_type: original
author:
- first_name: Muhamed A.
  full_name: Sewidan, Muhamed A.
  last_name: Sewidan
- first_name: Alexandra
  full_name: Rittmeier, Alexandra
  last_name: Rittmeier
- first_name: Laura
  full_name: Bollmers, Laura
  id: '61375'
  last_name: Bollmers
- first_name: Silia
  full_name: Babel, Silia
  id: '63231'
  last_name: Babel
  orcid: https://orcid.org/0000-0002-1568-2580
- first_name: Elisavet
  full_name: Chatzizyrli, Elisavet
  last_name: Chatzizyrli
- first_name: Juan S. S.
  full_name: Duran Gomez, Juan S. S.
  last_name: Duran Gomez
- first_name: Laura
  full_name: Padberg, Laura
  id: '40300'
  last_name: Padberg
- first_name: Christof
  full_name: Eigner, Christof
  id: '13244'
  last_name: Eigner
  orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
- first_name: Douglas
  full_name: Bremner, Douglas
  last_name: Bremner
- first_name: Andreas
  full_name: Wienke, Andreas
  last_name: Wienke
- first_name: Dietmar
  full_name: Kracht, Dietmar
  last_name: Kracht
- first_name: Moritz
  full_name: Hinkelmann, Moritz
  last_name: Hinkelmann
- first_name: Michael
  full_name: Kues, Michael
  last_name: Kues
citation:
  ama: Sewidan MA, Rittmeier A, Bollmers L, et al. High-performance photon-pair source
    using a two-photon-polymerized strip-loaded lithium niobate waveguide. <i>Optics
    Express</i>. 2026;34(16). doi:<a href="https://doi.org/10.1364/oe.596879">10.1364/oe.596879</a>
  apa: Sewidan, M. A., Rittmeier, A., Bollmers, L., Babel, S., Chatzizyrli, E., Duran
    Gomez, J. S. S., Padberg, L., Eigner, C., Silberhorn, C., Bremner, D., Wienke,
    A., Kracht, D., Hinkelmann, M., &#38; Kues, M. (2026). High-performance photon-pair
    source using a two-photon-polymerized strip-loaded lithium niobate waveguide.
    <i>Optics Express</i>, <i>34</i>(16), Article 29244. <a href="https://doi.org/10.1364/oe.596879">https://doi.org/10.1364/oe.596879</a>
  bibtex: '@article{Sewidan_Rittmeier_Bollmers_Babel_Chatzizyrli_Duran Gomez_Padberg_Eigner_Silberhorn_Bremner_et
    al._2026, title={High-performance photon-pair source using a two-photon-polymerized
    strip-loaded lithium niobate waveguide}, volume={34}, DOI={<a href="https://doi.org/10.1364/oe.596879">10.1364/oe.596879</a>},
    number={1629244}, journal={Optics Express}, publisher={Optica Publishing Group},
    author={Sewidan, Muhamed A. and Rittmeier, Alexandra and Bollmers, Laura and Babel,
    Silia and Chatzizyrli, Elisavet and Duran Gomez, Juan S. S. and Padberg, Laura
    and Eigner, Christof and Silberhorn, Christine and Bremner, Douglas and et al.},
    year={2026} }'
  chicago: Sewidan, Muhamed A., Alexandra Rittmeier, Laura Bollmers, Silia Babel,
    Elisavet Chatzizyrli, Juan S. S. Duran Gomez, Laura Padberg, et al. “High-Performance
    Photon-Pair Source Using a Two-Photon-Polymerized Strip-Loaded Lithium Niobate
    Waveguide.” <i>Optics Express</i> 34, no. 16 (2026). <a href="https://doi.org/10.1364/oe.596879">https://doi.org/10.1364/oe.596879</a>.
  ieee: 'M. A. Sewidan <i>et al.</i>, “High-performance photon-pair source using a
    two-photon-polymerized strip-loaded lithium niobate waveguide,” <i>Optics Express</i>,
    vol. 34, no. 16, Art. no. 29244, 2026, doi: <a href="https://doi.org/10.1364/oe.596879">10.1364/oe.596879</a>.'
  mla: Sewidan, Muhamed A., et al. “High-Performance Photon-Pair Source Using a Two-Photon-Polymerized
    Strip-Loaded Lithium Niobate Waveguide.” <i>Optics Express</i>, vol. 34, no. 16,
    29244, Optica Publishing Group, 2026, doi:<a href="https://doi.org/10.1364/oe.596879">10.1364/oe.596879</a>.
  short: M.A. Sewidan, A. Rittmeier, L. Bollmers, S. Babel, E. Chatzizyrli, J.S.S.
    Duran Gomez, L. Padberg, C. Eigner, C. Silberhorn, D. Bremner, A. Wienke, D. Kracht,
    M. Hinkelmann, M. Kues, Optics Express 34 (2026).
date_created: 2026-08-31T12:02:48Z
date_updated: 2026-08-31T12:11:43Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1364/oe.596879
intvolume: '        34'
issue: '16'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://opg.optica.org/oe/fulltext.cfm?uri=oe-34-16-29244
oa: '1'
publication: Optics Express
publication_identifier:
  issn:
  - 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: High-performance photon-pair source using a two-photon-polymerized strip-loaded
  lithium niobate waveguide
type: journal_article
user_id: '63231'
volume: 34
year: '2026'
...