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Related Experiment Video

Updated: May 24, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Integrated TiO2 resonators for visible photonics.

Jennifer T Choy¹, Jonathan D B Bradley, Parag B Deotare

¹School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. jchoy@fas.harvard.edu

|February 21, 2012

Summary

This summary is machine-generated.

We fabricated titanium dioxide racetrack resonators for visible light applications. These devices achieved high quality factors, demonstrating their potential for integrated photonics.

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Area of Science:

Materials Science
Optical Engineering
Nanotechnology

Background:

Integrated photonics relies on efficient light manipulation using optical resonators.
Titanium dioxide (TiO2) is a promising material for optical applications due to its high refractive index.
Developing high-quality factor resonators is crucial for advanced photonic devices.

Purpose of the Study:

To demonstrate waveguide-coupled titanium dioxide (TiO2) racetrack resonators.
To achieve high loaded quality factors in the visible wavelength range.
To explore the fabrication of TiO2-based photonic devices using standard nanofabrication.

Main Methods:

Fabrication of TiO2 thin films on silicon substrates using sputtering.
Patterning of racetrack resonator structures using top-down nanofabrication techniques.
Characterization of resonator performance via passive transmission measurements with a tunable red laser.

Main Results:

Successfully fabricated waveguide-coupled TiO2 racetrack resonators.
Achieved loaded quality factors (Q) of 2.2×10^4 for visible wavelengths.
Demonstrated passive probing of the fabricated structures.

Conclusions:

Waveguide-coupled TiO2 racetrack resonators can be fabricated using standard nanofabrication.
The achieved quality factors are promising for integrated photonic applications in the visible spectrum.
TiO2 is a viable material for high-performance optical resonators.