On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections

Bangshan Sun; Fyodor Morozko; Patrick S. Salter; Simon Moser; Zhikai Pong; Raj B. Patel; Ian A. Walmsley; Mohan Wang; Adir Hazan; Nicolas Barré; Alexander Jesacher; Julian Fells; Chao He; Aviad Katiyi; Zhen-Nan Tian; Alina Karabchevsky; Martin J. Booth

doi:10.1038/s41377-022-00907-4

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On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections

Original Articles

- On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections
- On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections
- Light: Science & Applications 2022年11卷第8期页码：1876-1890
- Affiliations：
  
  1.Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
  2.School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel
  3.Institute of Biomedical Physics, Medical University of Innsbruck, Müllerstraße 44, 6020, Innsbruck, Austria
  4.Ultrafast Quantum Optics group, Department of Physics, Imperial College London, London, UK
  5.Department of Physics, University of Oxford, Oxford, UK
  6.Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nürnberg, Paul-Gordan-Straße 6, 91052, Erlangen, Germany
  7.State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
- Author bio：
  
  Bangshan Sun (bangshan.sun@eng.ox.ac.uk)
  Alina Karabchevsky (alinak@bgu.ac.il)
  Martin J. Booth (martin.booth@eng.ox.ac.uk)
- Funds：
- DOI：10.1038/s41377-022-00907-4
  中图分类号：
- 纸质出版日期：2022-08-31，
  
  网络出版日期：2022-07-07，
  
  收稿日期：2021-12-06，
  
  修回日期：2022-06-10，
  
  录用日期：2022-06-21
- Accepted：
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Bangshan Sun, Fyodor Morozko, Patrick S. Salter, 等. On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections[J]. Light: Science & Applications, 2022,11(8):1876-1890.

Sun, B. S. et al. On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections. Light: Science & Applications, 11, 1876-1890 (2022).
Bangshan Sun, Fyodor Morozko, Patrick S. Salter, 等. On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections[J]. Light: Science & Applications, 2022,11(8):1876-1890. DOI： 10.1038/s41377-022-00907-4.

Sun, B. S. et al. On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections. Light: Science & Applications, 11, 1876-1890 (2022). DOI： 10.1038/s41377-022-00907-4.

摘要

Abstract

Photonics integrated circuitry would benefit considerably from the ability to arbitrarily control waveguide cross-sections with high precision and low loss

in order to provide more degrees of freedom in manipulating propagating light. Here

we report a new method for femtosecond laser writing of optical-fiber-compatible glass waveguides

namely spherical phase-induced multicore waveguide (SPIM-WG)

which addresses this challenging task with three-dimensional on-chip light control. Fabricating in the heating regime with high scanning speed

precise deformation of cross-sections is still achievable along the waveguide

with shapes and sizes finely controllable of high resolution in both horizontal and vertical transversal directions. We observed that these waveguides have high refractive index contrast of 0.017

low propagation loss of 0.14 dB/cm

and very low coupling loss of 0.19 dB coupled from a single-mode fiber. SPIM-WG devices were easily fabricated that were able to perform on-chip beam rotation through varying angles

or manipulate the polarization state of propagating light for target wavelengths. We also demonstrated SPIM-WG mode converters that provide arbitrary adiabatic mode conversion with high efficiency between symmetric and asymmetric nonuniform modes; examples include circular

elliptical modes

and asymmetric modes from ppKTP (periodically poled potassium titanyl phosphate) waveguides which are generally applied in frequency conversion and quantum light sources. Created inside optical glass

these waveguides and devices have the capability to operate across ultra-broad bands from visible to infrared wavelengths. The compatibility with optical fiber also paves the way toward packaged photonic integrated circuitry

which usually needs input and output fiber connections.

关键词

Keywords

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