| Autor: |
Salvador A. Medina-Rangel, Nicola Maraviglia, John O’Hara, Artem S. Vorobev, Simone Iadanza, Emanuele Pelucchi, Liam O’Faolain |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Photonics, Vol 11, Iss 9, p 800 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2304-6732 |
| DOI: |
10.3390/photonics11090800 |
| Popis: |
SU-8 is an emerging polymer material for integrated optical circuits that has demonstrated good structural properties in a cryogenic environment. In this article, we investigate the thermo-optical properties of SU-8 for a wavelength λ=850 nm, from room temperature to cryogenic temperature down to 14 K. To measure the material properties, we designed and fabricated SU-8 racetrack resonators via electron beam lithography. While cooling the device in a closed-cycle cryostat, we measured the resonance spectrum as a function of the temperature from which we determined the temperature-induced variations of the group and effective indices of the waveguide. With the aid of waveguide eigenmode simulations, we used these data to derive the temperature dependence of the SU-8 refractive index nSU−8T. At room temperature (T~295 K), the thermo-optic coefficient dnSU−8/dT=−5.3±0.2×10−5 K−1. At low temperature (T~14 K), dnSU−8/dT=−1.27±0.05×10−4 K−1. Our research shows the potential of SU-8 photonics in a cryogenic environment, suitable for the integration with quantum light sources emitting in the near infrared (NIR). |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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