Phase shift spectra of a fiber-microsphere system at the single photon level.

@article{Tanaka2011PhaseSS,
  title={Phase shift spectra of a fiber-microsphere system at the single photon level.},
  author={Akira Tanaka and Takeshi Asai and Kiyota Toubaru and Hideaki Takashima and Masazumi Fujiwara and Ryo Okamoto and Shigeki Takeuchi},
  journal={Optics express},
  year={2011},
  volume={19 3},
  pages={
          2278-85
        }
}
We succeeded in measuring phase shift spectra of a microsphere cavity coupled with a tapered fiber using a weak coherent probe light at the single photon level. We utilized a tapered fiber with almost no depolarization and constructed a very stable phase shift measurement scheme based on polarization analysis using photon counting. Using a very weak probe light (n = 0.41), we succeeded in observing the transition in the phase shift spectrum between undercoupling and overcoupling (at gap… 

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