Journal
OPTIK
Volume 265, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2022.169538
Keywords
Photonic crystal; Surface wave; Dirac semimetal; Transfer matrix method
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The study found that in semi-infinite one-dimensional photonic crystals, the frequency and localization of surface waves can be tuned by changing the cap layer's Fermi energy, for both transverse electric and transverse magnetic polarizations. Additionally, the thickness of the cap layer and the arrangement of photonic crystal layers have considerable effects on surface waves.
The dispersion relation and localization of surface waves in semi-infinite one-dimensional photonic crystals in the presence of Dirac semimetal as a cap layer are theoretically and numerically investigated, using the transfer matrix method at terahertz band. It is demonstrated that the frequency and localization of surface waves can be tuned by changing the cap layer's Fermi energy for both transverse electric and transverse magnetic polarizations. The numerical results show that the dispersion relation of surface waves and consequently their localization are more sensitive to changes in Fermi energy. Therefore, the surface states with the desired localization can be achieved. In addition, the effect of the cap layer's thickness and the arrangement of the photonic crystal layers on surface waves are investigated. The results show that these parameters have considerable effect on modification of surface waves.
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