Subwavelength-diameter optical fibre (SDF or SDOF) is an optical fibre whose diameter is less than the wavelength of the light being propagated through the fibre. An SDOF usually consists of long thick parts (same as conventional optical fibres) at both ends, transition regions (a.k.a. tapers), where the fibre diameter gradually decreases down to the subwavelength value, and a subwavelength-diameter waist, which is the main acting part of an SDOF.
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