Download A Novel Compact Photomic Crystal Fibre Surface Plasmon by Massaro, A.; Akowuah, E.K.; Gorman, T.; Ademgil, H.; Haxha, PDF
By Massaro, A.; Akowuah, E.K.; Gorman, T.; Ademgil, H.; Haxha, S.; Robinson, G.K.; Oliver, J.V
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Additional resources for A Novel Compact Photomic Crystal Fibre Surface Plasmon Resonance Biosensor for an Aqueous Environment
Example text
In both cases B is a double negative material (Ramakrishna, 2005). 1 Case 1: A is a dielectric material Figure 4 presents the optical transmission of the three types of the studied photonic crystals versus of the frequency of the light beam so that we can observe easily the band-gaps. One easily observes that the (AB)16 type photonic crystals have two band gaps, the (ABBA)8 type crystals have three band-gaps and the (ABBABAAB)4 type crystals have four bandgaps. The values are given in table 1. 5) Table 1.
3. 4mW/cm2 . Under TB approximation, it can be shown that the group velocity at the resonance bands can be written as [25]: 36 Photonic Crystals – Innovative Systems, Lasers and Waveguides Vg R sin(kR) (5) where ĸ indicates coupling factor that is the value related to the overlapping of the electric field between the localized modes. 8 10 6 m , is the separation between each of defect mediums and k is the wave vector of the light traveling in 1D-NCCW. The coupling factor can be written as [25]: ( res ) FWHM 2 (6) which indicates the inverse proportionality of the coupling factor to the quality factor ( Q ) 1 of cavity modes ( ).
Theory 1D-NCCW is formed by placing optical resonator in a linear array, to guide light through whole of the structure by photon hopping between adjacent resonators. As a result of overlapping the evanescent field in the defect medium, cavity zone, electric field enhancement in this region can be obtained. Tight binding (TB) approximation (like using it in solid state physics) is used to describe the mechanism of waveguiding of the structure. 45, respectively for construction the basic resonators.