Photonic bandgap microcavity

Wehrspohn RB, Kitzerow H-S, Busch K (eds) (2008) Nanophotonic materials. Wiley, Weinheim Weiss SM, Ouyang H, Zhang J, Fauchet PM (2005a) Electrical and thermal modulation of silicon photonic bandgap microcavities containing liquid crystals. Opt Express 13(1090)... 

FIGURE 4.2. Illustration of a two-dimensional photonic bandgap structure in which the white regions possess a high refractive index and the black regions represent air holes. Such structures can have a complete photonic bandgap under appropriate conditions. When a defect is introduced in the perfectly periodic lattice, a microcavity can be created. 

Weisbuch, C. and Rarity, J. G. (Eds.) (1996). Microcavities and Photonic Bandgaps Physics and Applications. Kluwer, Dordrecht ... 

For the formation of microcavities, it is necessary that a complete two-dimensional PBG exists at least for one polarization (TE or TM) and ideally for both polarizations. This involves careful design and requires that there be a sufficient index difference between the two materials. The photonic band structure of a triangular lattice of air holes in a membrane of SiCF coated with a thin layer of organic semiconductor has been described in Ref 24. Such a structure has been shown to possess a complete bandgap for TE polarized light. In a photonic lattice which possesses a complete bangap, it is possible to create a microcavity... 

Another feature of the PhC is photonic localization (Maloshtan and Kilin 2007). By introducing certain defects into PhCs, their existing periodicity or symmetry will be destroyed. When this happens, a rather narrow defective state occurs within the PBG, and corresponding photons would be confined to defect. In other words, by locally breaking the period into PhC, one can introduce a photonic defect mode within the bandgap and, as a result, the transmission spectrum has a relatively sharp transmission peak (see Fig. 6.3b). For example, a PhC microcavity can be formed by removing a... 

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