In situ observation of slow and tunnelling light at the cutoff wavelength of an optical fiber.

  title={In situ observation of slow and tunnelling light at the cutoff wavelength of an optical fiber.},
  author={Yong Yang and Misha Sumetsky},
  journal={Optics letters},
  volume={45 3},
Slow waves and tunneling waves can meet at the cutoff wavelengths and/or the transmission band edges of optical and quantum mechanical waveguides. The experimental investigation of this phenomenon, previously performed using various optical microstructures, is challenged by fabrication imperfections and material losses. Here, we demonstrate this phenomenon in situ for whispering gallery modes slowly propagating along a standard optical fiber, which possesses a record uniformity and… 

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