Thermal insensitivity of an ENZ-ITO clad, hollow-core micro-ring resonator
We report on the experimental demonstration of temperature insensitivity in an epsilon-near-zero (ENZ) indium-tin-oxide (ITO) cladded, hollow-core micro-ring resonator. The permittivity of the ITO cladding was engineered to a near zero value at 1550 nm wavelength to support index guiding in the air-ITO waveguide around the C band. The air-ITO ring-resonator structure was designed using numerical simulations to support whispering gallery modes. The hollow-core microresonator structure was fabricated using two-photon lithography to 3D print a sacrificial scaffold. Guided resonator modes were observed by coupling tunable laser light to the ring resonator using a tapered fiber. The demonstrated hollow-core microresonator exhibits athermal behavior and has a temperature dependent wavelength shift of 1 pm/°C.
Authors
- Weimin Zhou (ORCID: https://orcid.org/0000-0002-0945-5840)
- Jimmy H. Ni (ORCID: https://orcid.org/0000-0002-2773-6304)
- Sang-Yeon Cho (ORCID: https://orcid.org/0000-0002-4721-4087)
- Andrew S. DeLoach
- Stephen Anderson (ORCID: https://orcid.org/0000-0001-9211-5646)
Institutions
- DEVCOM Army Research Laboratory (US)
- United States Army Combat Capabilities Development Command (US)
Publication Details
- Journal
- Scientific Reports
- Published
- 2025-03-29
- DOI
- https://doi.org/10.1038/s41598-024-82147-7
- Citations
- 2
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 1.46
Funders
- U.S. Army