Tunable multichannel Fibonacci one-dimensional terahertz photonic crystal filter

Abstract

This paper proposes a multichannel terahertz optical filter based on a one-dimensional photonic crystal with a third-order Fibonacci structure, including a bulk Dirac semimetal. The tuning of the optical properties of the proposed structure has been theoretically studied as a function of the Dirac semimetals' Fermi energy. Furthermore, the effects of the Fibonacci structure's periodic number and light's incident angle on optical channels were investigated. The results reveal that changes in the Fermi energy and incident angle remarkably affect the frequency and transmission of the optical channels. Additionally, the number of optical channels increases by increasing the periodic number of the Fibonacci structure.

Observation of photonic Peierls transition for manipulating microwave in metallic diaphragm-array periodic structures

“…Thus, the photonic Peierls transition involves the effect of modifying the bandgaps of one-dimensional metal periodic structures, which is essentially a role of manipulating the photonic bandgaps . In the literature, one-dimensional multi-layer film bandgap structures 30 – 32 , including the photonic and phononic crystals with various medium distribution such as tunable multichannel Fibonacci structure 32 , have been employed in some applied fields such as poliovirus sensing and greenhouse gas detection 30 – 33 . Some of the materials that are used to fabricate such multi-layer structures are superconducting nanomaterial-dielectric superlattices 34 , 35 .…”

On-Chip Topological Photonic Crystal Nanobeam Filters

“…Their integration into these devices facilitates the precise control of light within specific wavelength ranges. − Photonic crystals (PCs) have emerged as a prominent platform for designing on-chip filters. PCs are artificial optical materials with periodic structures that exhibit a band gap in which the propagation of light is forbidden. , Via the introduction of defects into the bulk PCs, photonic cavities can be formed, enabling the selective transmission or blocking of certain wavelengths. − PC-based filters offer the advantage of miniaturization and precise control over the transmission spectrum by adjusting the structural parameters of the introduced defects. This tailorable spectral response enables customized filtering characteristics.…”