Ultrasound sensing with optical microcavities.

Area of Science:

• Optics and Photonics
• Biomedical Engineering
• Materials Science

Background:

• Traditional piezoelectric ultrasound sensors face limitations in sensitivity and spatial resolution, especially at smaller scales.
• Optical ultrasound sensors, particularly those using high-quality factor (Q) optical microcavities, present a promising alternative with enhanced performance.
• Microcavity-based sensors enable mass production on silicon chips, facilitating miniaturization and integration.

Purpose of the Study:

• To review recent advancements in optical ultrasound sensing technologies utilizing microcavities.
• To explore the sensing mechanisms and optimization parameters of different microcavity types for ultrasound detection.
• To highlight the diverse applications of microcavity-based ultrasound sensors in areas like photoacoustic imaging and particle detection.

Main Methods:

• Focus on three types of optical microcavities: Fabry-Perot cavities, π-phase-shifted Bragg gratings, and whispering gallery mode microcavities.
• Overview of ultrasound sensing mechanisms employed by these microcavities.
• Survey of recent research and applications in microcavity-based ultrasound sensing.

Main Results:

• Optical microcavities achieve high sensitivity and spatial resolution in ultrasound sensing.
• These sensors demonstrate high bandwidth and potential for mass production.
• Applications span photoacoustic imaging, ranging, and particle detection, showcasing versatility.

Conclusions:

• Optical microcavities represent a significant advancement in ultrasound sensing technology.
• These sensors offer superior performance and miniaturization capabilities over traditional methods.
• Future development holds promise for high-performance ultrasound imaging and sensing applications.