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In-Fiber BaTiO3 Microsphere Resonator for High-Sensitivity Temperature Measurement
Chi Li1,2, Meng Zhu1,2, Peng Ji1,2
1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Micromachines
|April 3, 2021
Summary
Researchers developed a novel fiber optic whispering gallery mode (WGM) resonator by combining a polymer waveguide and a microsphere. This device demonstrated a linear temperature sensitivity of -593 pm/°C, showing potential for precise temperature sensing applications.
Area of Science:
- Optoelectronics
- Photonics
- Materials Science
Background:
- Whispering gallery mode (WGM) resonators are highly sensitive optical devices.
- Integrating waveguides with microspheres presents fabrication challenges.
- Developing robust and sensitive WGM resonators is crucial for various sensing applications.
Purpose of the Study:
- To propose and realize a novel fiber optic WGM resonator.
- To investigate the optical properties and temperature response of the fabricated resonator.
- To demonstrate the potential of this integrated device for temperature sensing.
Main Methods:
- Fabrication of an inline polymer waveguide using femtosecond laser-assisted multiphoton polymerization within a grooved hollow-core fiber.
- Integration of the polymer waveguide with microsphere WGM resonators.
- Experimental and simulation-based investigation of stimulated WGM transmission spectra.
- Characterization of the temperature response of the WGM resonators.
Main Results:
- Successful fabrication of two fiber optic WGM resonators with microspheres of varying sizes.
- Experimental and simulated transmission spectra of stimulated WGMs were obtained.
- A linear temperature sensitivity of -593 pm/°C was achieved for the resonators in the temperature range of 20 °C to 100 °C.
Conclusions:
- The proposed fiber optic WGM resonator design integrating a polymer waveguide and microsphere is feasible.
- The fabricated resonators exhibit significant temperature sensitivity, suitable for sensing applications.
- This integrated approach offers a promising platform for developing advanced optical sensors.
