Work

Thermal insensitivity of an ENZ-ITO clad, hollow-core micro-ring resonator

Year: 2025

Type: article

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.

Source: Scientific Reports

DOI: 10.1038/s41598-024-82147-7

Authors: Andrew S. DeLoach, Stephen R. Anderson, Sang-Yeon Cho, Jimmy H. Ni, Weimin Zhou

Institutions: DEVCOM Army Research Laboratory, United States Army Combat Capabilities Development Command

Language: English

Topic: Photonic and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funder: U.S. Army