Abstract
There is always a coupling between the degenerate clockwise (CW) and counter-clockwise (CCW) modes in a whisperinggallery- mode (WGM) optical microresonator, since the surface of the microresonator can not be perfectly smooth. It is important to measure this coupling strength in many applications. When the coupling strength is strong, the conventional method by observing mode splitting in the stationary spectrum can be used to measure its value. However, when the coupling strength is weak, the conventional method will not work. We experimentally demonstrate that the ringing phenomenon can be used to measure weak coupling strength between the CW and CCW modes in a WGM optical microresonator.
Highlights
When the coupling strength is strong, the conventional method by observing mode splitting in the stationary spectrum can be used to measure its value
We experimentally demonstrate that the ringing phenomenon can be used to measure weak coupling strength between the CW and CCW modes in a whisperinggallery- mode (WGM) optical microresonator
Zhu et al experimentally showed that the deposition of nanoparticles on the WGM microresonator could be detected by observing the change of the coupling strength between the CW and CCW modes[22]
Summary
When the coupling strength is strong, the conventional method by observing mode splitting in the stationary spectrum can be used to measure its value. We experimentally demonstrate that the ringing phenomenon can be used to measure weak coupling strength between the CW and CCW modes in a WGM optical microresonator.
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