| Jahr | 2025 |
| Autor(en) | Ravi Pradip, Akhil Varri, Liam McRae, Frank Brückerhoff-Plückelmann, Daniel Wendland, Philipp Lohmann, Rongyang Xu, Anna P. Ovvyan, Shabnam Taheriniya, Wolfram Pernice, and Simone Ferrari |
| Titel | Fast thermo-optic switching through parity-time symmetry breaking |
| KIP-Nummer | HD-KIP 25-51 |
| KIP-Gruppe(n) | F31 |
| Dokumentart | Paper |
| Kommentar | Funding: Deutsche Forschungsgemeinschaft (EXC 2181/1—390900948, EXC?2082/1—390761711, CRC 1459); HORIZON EUROPE Framework Programme (101017237, PHOENICS project); HORIZON EUROPE European Innovation Council (grant no. 101046878, HYBRAIN project). |
| Quelle | Optics Express Vol. 33, Issue 17, pp. 36100-36109 (2025) |
| doi | https://doi.org/10.1364/OE.567666 |
| Abstract (en) | Reconfigurable photonic integrated circuits (PICs) are key elements for emerging applications like photonic sensing, LiDAR, and quantum computing. In such applications, optical switches with fast response and robust fabrication methods are crucial for reprogramming linear optical transformations on demand. Here, we demonstrate a fast thermo-optic switching mechanism on the silicon nitride on insulator platform, leveraging parity-time symmetry breaking. The cladding-free design operating at 775 nm enables optical propagation in a partially metal-covered waveguide with minimal loss—an uncommon phenomenon given the typical absorption associated with metal proximity. The fabricated device exhibits a 7.1 µs rise time for a π phase shift, despite the weak thermo-optic coefficient in silicon nitride. Our design provides reproducible fabrication metrics and holds promises for large-scale photonic networks operating at visible wavelengths.
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