Related Experiment Video
Updated: Jun 24, 2025
13:02
Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
Published on: February 25, 2017
9.7K
Radiation hardness of open Fabry-Pérot microcavities
Optics Express
|June 11, 2024
Summary
High-finesse microcavities using dielectric mirrors show excellent radiation hardness. These optical devices maintain performance after high-dose radiation, enabling new radiation dosimetry applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Medical Physics
Background:
- High-finesse microcavities utilize low-loss dielectric mirrors to achieve long effective optical path lengths for precision sensing.
- Fabry-Pérot microcavities are being explored for compact, high-precision sensing applications, including in vivo dosimetry.
Purpose of the Study:
- To investigate the radiation hardness of Fabry-Pérot microcavities constructed with dielectric mirrors on optical fiber tips.
- To assess the impact of both conventional and ultrahigh (FLASH) radiotherapy dose rates on microcavity performance.
Main Methods:
- Fabry-Pérot microcavities were fabricated using dielectric mirrors deposited on optical fiber tips.
- Microcavities were subjected to irradiation at conventional (∼0.1 Gy/s) and ultrahigh (∼20 Gy/s) dose rates.
- Mirror absorption was measured to detect any degradation post-irradiation.
Main Results:
- No degradation in mirror absorption was observed within a measurement sensitivity of ∼40 ppm loss.
- The microcavities withstood accumulated doses exceeding 300 Gy.
- The dielectric mirrors demonstrated excellent radiation hardness under tested conditions.
Conclusions:
- Dielectric mirrors used in Fabry-Pérot microcavities exhibit remarkable radiation hardness.
- This finding supports the development of optics-based, real-time, in vivo radiation dosimeters with high spatial resolution.
- The radiation-hardened microcavities are suitable for applications in high-radiation environments.
