title: Diameter measurement of optical nanofibers using a composite photonic crystal cavity.
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.
authors.forename: Jameesh
authors.initials: J
authors.lastname: Keloth
authors.forename: Mark
authors.initials: M
authors.lastname: Sadgrove
authors.forename: Ramachandrarao
authors.initials: R
authors.lastname: Yalla
authors.forename: Kohzo
authors.initials: K
authors.lastname: Hakuta