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Related Experiment Video

Updated: May 3, 2026

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Nested Ring Resonant Sagnac-Enhanced Photothermal Gas Sensing Using a Nanofiber.

Fu Wan¹, Lei Zhu¹, Yaotian Bai¹

¹State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China.

Analytical Chemistry

|March 5, 2026

Summary

A novel nested ring resonant Sagnac-enhanced photothermal (PT) gas sensor achieves high sensitivity and fast response for trace gas detection. This PT sensor offers practical usability for remote monitoring applications.

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Area of Science:

Optics and Spectroscopy
Chemical Sensing
Nanotechnology

Background:

Photothermal (PT) spectroscopy offers high sensitivity and selectivity for trace gas detection.
Developing PT gas sensors with fast response, high sensitivity, and practical usability is challenging.

Purpose of the Study:

To demonstrate a nested ring resonant Sagnac-enhanced PT gas sensor using a nanofiber.
To improve sensitivity and response time for trace gas detection.

Main Methods:

Utilizing a nested ring resonator within a Sagnac loop to enhance cavity finesse.
Employing a nanofiber for PT phase modulation.
Achieving acetylene (C2H2) detection with a 2 cm nanofiber and resonator finesse of 73.

Main Results:

Achieved a noise equivalent concentration of 16 ppb for C2H2 detection.
Demonstrated a response time of 19 s and <3% instability over 2 h.
Improved sensitivity by a factor of 10 compared to a nonresonant Sagnac interferometer.

Conclusions:

The nested ring resonant Sagnac-enhanced PT sensor successfully integrates fast response and high sensitivity.
The sensor design simplifies operation, making it suitable for remote monitoring and distributed sensing.