Journal
LASER & PHOTONICS REVIEWS
Volume 14, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000024
Keywords
femtosecond laser micromachining; integrated quantum photonics; reconfigurable photonic circuits; thermal phase shifting
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (project CAPABLE) [742745]
- Italian Ministry of Education, University and Research (MIUR), PRIN 2017 programme [2017SRNBRK]
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Femtosecond laser writing is a powerful technique that allows rapid and cost-effective fabrication of photonic integrated circuits with unique 3D geometries. In particular, the possibility to reconfigure such devices by thermo-optic phase shifters represents a paramount feature, exploited to produce adaptive and programmable circuits. However, the scalability is strongly limited by the flaws of current thermal phase shifters, which require hundreds of milliwatts to operate and exhibit large thermal crosstalk. In this work, thermally-insulating 3D microstructures are exploited to decrease the power needed to induce a 2 pi phase shift down to 37 mW and to reduce the crosstalk to a few percent. Further improvement is demonstrated when operating in vacuum, with sub-milliwatt power dissipation and negligible crosstalk. These results pave the way toward the demonstration of complex programmable integrated photonic circuits fabricated by femtosecond laser writing, thus opening exciting perspectives in integrated quantum photonics.
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