Diameter measurement of optical nanofibers using a composite photonic crystal cavity

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Abstract
We demonstrate a method for making precise measurements of the diameter of a tapered optical fiber with a sub-wavelength diameter waist (an optical nanofiber). The essence of the method is to create a composite photonic crystal cavity by mounting a defect-mode grating on an optical nanofiber. The resultant cavity has a resonance wavelength that is sensitive to the nanofiber’s diameter, allowing the diameter to be inferred from optical measurements. This method offers a precise, nondestructive, and in situ way to characterize the nanofiber diameter.
Funding Information
  • Japan Science and Technology Agency (JST)
  • Japan Society for the Promotion of Science (JSPS) (15K13544)
  • Ministry of Education, Culture, Sports, Science, and Technology (MEXT)

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