Modal coupling strength in a fibre taper coupled silica microsphere

The character of the modal coupling strength β between clockwise (CW) and counterclockwise (CCW) whispering gallery modes (WGMs) represents an intrinsic property of a microsphere cavity, which is an important factor for the application of both micro-laser and cavity QED. Depending on a fibre taper coupled microsphere with quality factor larger than 107, modal coupling has been observed, while reflection spectra have been captured to derive the practical modal coupling strength. Upon obtaining results the modal coupling strength is confirmed to be a constant determined only by a microcavity and modes under excitation. This measurement system and results enable ways not only to acquire the material character of a microcavity, but also to analyse microsphere-based cavity QED research.

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