Optica Publishing Group

Polarization-dependent zero-plasma-permittivity, zero-permittivity and zero-permeability gaps in 1D photonic crystal composed of lossy double-negative and magnetic cold plasma materials

Posted on 2022-08-05 - 16:26
Theoretically, we have employed transfer matrix to examine the tunable band structure and transmission properties of one-dimensional photonic crystal composed of alternating layers of lossy double negative and magnetic cold plasma materials. Our study shows that the existence of unconventional photonic band gaps due to material dispersion properties of DNG and MCP layers and fundamentally differs from Bragg gaps which arise due to interference mechanism. The two new gaps called as zero permittivity (ε = 0) and zero permeability (µ = 0) gaps near the frequency at which permittivity and permeability of DNG material changes sign have been found for non zero incidence angle corresponding to p- and s- polarizations respectively. These gaps can be easily tuned as well as enlarged by the application of external magnetic field in both right hand polarization and left hand polarization configurations. At fixed magnetic field ε = 0 and µ = 0 gaps corresponding to p- and s- polarizations respectively can be further enhanced by increasing the angle of incidence to higher values. Additionally we have also found tunable zero plasma permittivity (εP = 0) gap close to the frequency at which magnetic field dependent electric permittivity of clod plasma layer changes sign at non zero incident angle corresponding to p- polarization only. Finally we have presented the novel way by which zero-effective-phase gap, ε = 0 gap and εP = 0 gap can be joined together to produce enlarged PBG at non zero incidence angle corresponding to p- polarization only in presence of an external magnetic field of value BL = 473 mT. The proposed study may be used for designing of polarization triggered tunable optical devices in microwave engineering applications.


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