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Updated: Jul 2, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Thermal insensitivity of an ENZ-ITO clad, hollow-core micro-ring resonator
Andrew S DeLoach1, Stephen R Anderson2, Sang-Yeon Cho2
1DEVCOM Army Research Laboratory, 2800 Powder Mill Rd, Adelphi, MD, 20783, USA. andrew.s.deloach.civ@army.mil.
Abstract:
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.
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