Field enhancement within an optical fibre with a subwavelength air core

Theoretical study of liquid-immersed exposed-core microstructured optical fibers for sensing

“…The higher refractive index material (bismuth in this case) exhibits greater confinement, as seen by the smaller dimensions of the bismuth fiber core, and thus has a greater high intensity peak at the boundary. This thin-layer high intensity peak has previously been investigated by other authors [16][17][18] and we shall see that it is beneficial for fluorescence sensing applications [19]. Note that only the mode with polarization parallel to the axis of symmetry has a high intensity peak in the sensing region for the exposed core fiber, and we will see this leads to significant differences in the relative fluorescence capture into each of the fundamental modes.…”

Comparative Study of Dispersion between Conventional PCF and Honeycomb PCF

“…In IG-PCFs, light is guided in a higher index core by modified total internal reflection from a photonic crystal cladding with low effective index while in BG-PCFs; light is confined in a low index core by trapping the light having the wavelength falling in the band gap of the photonic crystal structure [6,7]. Because of their novel guiding mechanism and diversity in design, PCFs have a number of novel properties and significant applications.…”

Evolution of the diffraction pattern during the transition from the near-field toward the far-field region

“…After such reduction, the methods known for analyzing modality of traditional fibers may be applied [19][20][21]. The other approach bases on analysis of a near-field pattern [22]. Such analysis, however, may be particularly challenging in a case of the fibers with high refractive index contrast where a near-field region extends not further than a few micrometer from the fiber end.…”

“…Such analysis, however, may be particularly challenging in a case of the fibers with high refractive index contrast where a near-field region extends not further than a few micrometer from the fiber end. Thus in order to obtain detailed information about the near-field distribution the near-field scanning microscopy need to be used [22].…”