#Add endnote with ieee Pc
In this paper we extend this novel application of PCF by tapering the fiber to reduce the pitch (Λ) of the PC microstructure, thus shifting the fundamental partial bandgap to shorter wavelengths. This work has potentially important applications in microphotonics using existing PCF manufacturing technology, or in improving that technology by providing feedback during the fiber draw process. In the experiments, we found a fundamental partial gap at ~3.0 µm and a higher order gap at ~1.5 µm. We recently demonstrated that in this geometry we can directly measure the stop bands associated with microstructure of an index-guiding PCF. However, one may also use these fibers in a transverse geometry, where the light propagates normal to the holes, similar to 2-D PC slabs.
Ĭonventionally, light propagates parallel to the holes in these fibers and is guided either by the interface between a high index core and low effective index microstructure, or by the stop bands of the PBG structure. The fiber cross-section can be designed to achieve different guiding mechanisms and to exploit various physical phenomena such as single mode operation over an extended wavelength range, hollow-core guidance and non-linear effects such as super-continuum generation. Photonic crystal fibers (PCFs) are optical fibers with a regular pattern of holes that run parallel to the fiber axis such that the cross-section comprises a PBG structure which can radially confine light. For example, in 2-D photonic crystals (PCs), PBG materials typically comprised of a slab dielectric with a regular pattern of holes etched in it, a line of defects in the pattern can form a planar waveguide. Wavelengths that lie within the bandgap are forbidden from propagating through the material, lending PBG structures naturally to the applications in filtering and confinement. Photonic bandgap (PBG) materials have properties that make them useful for next generation photonic device applications. Our optical measurements are correlated with band structure calculations.
We show that the fundamental gap can be shifted down to the communications wavelengths, or even further to the visible spectrum. We probe the tapered fiber in the transverse geometry to demonstrate the scaling of the photonic bandgaps associated with the microstructure. We demonstrate the tapering of a photonic crystal fiber to achieve a microstructure pitch of less than 300 nm. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.
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