Abstract
In this study, We theoretically realized the enlargement of the photonic crystal band gap by a photonic heterostructure containing Dirac semimetal layer. At the same time, since the dielectric constant of the Dirac semimetal changes with its Fermi level, based on this characteristic, we have realized the adjustment of the band gap of the enlarged photonic crystal. Comparing a single photonic crystal with a heterostructure photonic crystal, it is found that the photonic band gap of the heterostructure photonic crystal is significantly enlarged, and then the effects of different incident angles and polarized waves on the photonic band gap are analyzed. Based on the above properties, it has potential applications in tunable photonic crystal devices.
Highlights
Photonic crystals (PCs) are artificial materials that are periodically arranged by mediums of different refractive indices since Yablonovitch[1] and John[2] proposed firstly
The omnidirectional photonic crystal band gaps (OPBGs) is that electromagnetic waves are prohibited from propagating in all directions and polarizations, which have potential applications in omnidirectional high reflectors,[6,7,8] optical fibers,[9,10] and Fabry–Perot resonators.[11]
Through the analysis of the above transverse electric (TE) and transverse magnetic (TM) polarization transmission spectra, we discover that the bandwidth of OPBGs is only determined by the TM polarization, and we can obtain the overall frequency range of the OPBG, which is between the two blue lines from 4.2 to 5 THz, and the frequency bandwidth is ∆ω = 0.8 THz
Summary
Photonic crystals (PCs) are artificial materials that are periodically arranged by mediums of different refractive indices since Yablonovitch[1] and John[2] proposed firstly. Wang et al researched ultrafast broadband photodetectors based on the 3D Dirac semimetal Cd3As2, which indicate great potential in improving the performance of photodetector[15] Chen and colleagues theoretically obtained the plasmon-induced transparency effect through the weak coupling between different-strip-structure metamaterials made of Dirac semimetals.[16,17,18,19] Liu et al studied a tunable narrowband absorber based on BDSs.[20] In our previous work,[21] the tunable Dirac semimetals induced OPBG of one-dimensional photonic crystals (1D PCs) was studied. The tunability of the enlargement OPBG is realized by changing the Fermi energy of the Dirac semimetals, which has not been extensively studied in previous research.
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