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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Enhancement of Dissipative Sensing in a Microresonator Using Multimode Input.

Sreekul Raj Rajagopal¹, A T Rosenberger¹

¹Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.

Sensors (Basel, Switzerland)

|September 9, 2022

Summary

This summary is machine-generated.

Multimode input significantly enhances optical microresonator chemical sensing. This technique boosts dip-depth sensing sensitivity by over a thousand times compared to single-mode input, offering a more sensitive detection method.

Keywords:

dissipative sensing microresonator multimode fiber whispering-gallery modes

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Area of Science:

Photonics
Chemical Sensing
Optical Microresonators

Background:

Optical whispering-gallery microresonators are effective chemical sensors.
Current methods primarily use dispersive sensing, detecting frequency shifts.
Dissipative sensing, particularly through mode linewidth changes, offers higher sensitivity.

Purpose of the Study:

To investigate enhancing dip-depth dissipative sensing using multimode input.
To compare the sensitivity of multimode versus single-mode input for microresonator sensing.
To explore the potential of multimode input to improve sensing performance.

Main Methods:

Utilizing optical whispering-gallery microresonators with multimode fiber or waveguide input.
Measuring changes in the throughput dip depth of resonator modes.
Comparing dip-depth response with in-phase and out-of-phase input modes.

Main Results:

Multimode input enhances dip-depth sensing by over 1000 times compared to single-mode input.
Dip-depth sensing becomes nearly 100 times more sensitive than linewidth-change sensing with multimode input.
Enhancement factors are independent of the mode linewidth or quality factor (Q).

Conclusions:

Multimode input provides a significant enhancement for dip-depth dissipative sensing in optical microresonators.
This approach offers a substantial improvement in sensitivity over traditional dispersive and linewidth-based sensing methods.
The method relies on simple measurements of dip depth with controlled input mode phase relationships.