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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 (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. ==Name== There is no general agreement on how these optical elements are to be called, different groups preferring to emphasize different properties of such fibres, sometimes even using different terms. The names in use include: * subwavelength waveguide, subwavelength optical wire, subwavelength-diameter silica wire, subwavelength diameter fibre taper * (photonic) wire waveguide, photonic wire, photonic nanowire, optical nanowires, optical fibre nanowires〔(Optical Fibre Nanowires and Related Devices Group ), University of Southampton〕 * tapered (optical) fibre, fibre taper * submicron-diameter silica fibre * ultrathin optical fibres * optical nanofibre * optical microfibres * submicron fibre waveguides *Micro/Nano optical wires (MNOW) The term ''waveguide'' can be applied not only to fibres, but also to other waveguiding structures such as silicon photonic subwavelength waveguides. The term ''submicron'' is often synonymic to ''subwavelength'' in this case, taking into account that the majority of experiments are carried out with the light with the wavelength between 0.8 and 1.6 µm;〔 however for other wavelengths this may not be true. All the names including the prefix ''nano-'' are somewhat misleading, since it is usually applied to objects with dimensions on the scale of nanometers or tens of nanometers (cf. nanoparticle, nanotechnology). The characteristic behaviour of the SDOF—high intensity of the electromagnetic field both inside and outside the fibre, maximum confinement of light in transversal cross-section—appears when the fibre diameter is about half of the wavelength of light. That is why the term ''subwavelength'' is the most appropriate for these objects. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Subwavelength-diameter optical fibre」の詳細全文を読む スポンサード リンク
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