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Fabrication and Testing of Microfluidic Optomechanical Oscillators

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Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system.

Fang Bo^1,2, Şahin Kaya Özdemir³, Faraz Monifi⁴

¹The MOE Key Laboratory of Weak Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin, 300457, China. bofang@nankai.edu.cn.

Scientific Reports

|August 16, 2017

Summary

This summary is machine-generated.

We discovered an unexpected oscillation in the coupling strength between whispering-gallery-mode (WGM) resonators and fiber tapers. This finding simplifies achieving critical coupling in optical systems.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Whispering-gallery-mode (WGM) resonators are crucial for optical sensing and communication.
Efficient coupling between WGM resonators and waveguides is essential for device performance.

Purpose of the Study:

To investigate the coupling dynamics between a WGM microdisk resonator and a fiber taper.
To explore the influence of two distinct coupling regions on energy exchange.
To understand the conditions for achieving critical coupling in such systems.

Main Methods:

Theoretical modeling of two-point coupling.
Experimental measurements of resonator linewidth and transmission.
Lateral movement of a fiber taper above a microdisk resonator.

Main Results:

Observed oscillatory behavior in coupling strength with varying distance between coupling regions.
Interference between coupled light fields explains the oscillations.
Critical coupling achieved through collective coupling at two regions, not requiring it at individual regions.

Conclusions:

The study reveals a novel oscillatory behavior in two-region WGM resonator-waveguide coupling.
This discovery relaxes critical coupling conditions, benefiting fundamental research.
Potential for enhanced practical applications in optical devices utilizing WGM resonators.