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Label-free Single Molecule Detection Using Microtoroid Optical Resonators

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Optical mode localization sensing based on fiber-coupled ring resonators.

Shumeng Wang, Hailong Pi, Yu Feng

|June 29, 2023

Summary

This summary is machine-generated.

We demonstrated optical mode localization in fiber-coupled ring resonators for the first time. This phenomenon enables ultra-sensitive temperature sensing with a high variation rate, outperforming traditional methods.

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Area of Science:

Optics and Photonics
Resonator Physics
Sensing Technologies

Background:

Mode localization is a key phenomenon in coupled micro-electro-mechanical systems (MEMS) for sensitive detection.
Coupled resonators exhibit resonant mode splitting when multiple resonators are linked.
Localized perturbations can cause uneven energy distribution in split modes, known as mode localization.

Purpose of the Study:

To experimentally demonstrate optical mode localization in fiber-coupled ring resonators.
To investigate the potential of optical mode localization as a novel sensing mechanism.
To evaluate its performance for ultra-sensitive temperature sensing applications.

Main Methods:

Coupling two fiber-ring resonators.
Applying localized thermal perturbation using two thermoelectric heaters.
Defining and measuring the normalized amplitude difference between split modes.

Main Results:

Successfully demonstrated optical mode localization in the fiber-coupled resonator system.
Observed a normalized amplitude difference variation from 2.5% to 22.5% for a temperature change of 0K to 8.5K.
Achieved a high variation rate of approximately 2.4%/K, significantly exceeding frequency-based thermal sensing.

Conclusions:

Optical mode localization is experimentally feasible in fiber-coupled ring resonators.
This phenomenon offers a promising new sensing mechanism for ultra-sensitive fiber temperature sensing.
The demonstrated high variation rate validates its potential over conventional methods.