Tunable Dual- and Multi-Channel Filter Based on Cantor Photonic Crystals Embedded With Graphene

Abstract

We theoretically investigate the tunable dual-and multi-channel filter in one-dimensional aperiodic photonic crystals (PCs) embedded with graphene. The dielectrics slabs arrayed alternately submit to the Cantor sequence rule and graphene sheets are local at the interfaces of dielectrics layers. Cantor PCs are fractal structures and support a series of discrete resonant channels in transmission spectra, viz. fractal states. Consequently, dual-and multi-filtering channels could be achieved in the compound systems. The central wavelength of each channel and its value of transmission could be modulating by the chemical potential of grapheme and the incident angle as well. It shows that the dual-channel amplitude of transmission can be varied by over 100% and the multiple channels could be switched on and off by the chemical potential of graphene. This study will be very helpful in designing tunable optical filters.

Photonic Band Gap and Fractal Resonances in Aperiodic Cantor-like Self-Similar a:SiNx Photonic Structures

“…Light propagation and light–matter interactions in wavelength-order periodic photonic architectures without translational invariance offer unprecedented control over photon propagation and manipulation, unlike typical periodic structures. − On the other hand, aperiodic photonic structures have been the subject of investigation recently because of their controlled photonic band gap (PBG) and narrow transmission minibands, leading to their application capabilities. , Such investigations are largely theoretical to elucidate the aperiodic quasicrystals, such as Fibonacci and Thue-Morse structures, − while the experimental realization is particularly for the infrared spectral window applications . Among them, cantor sequence-based structures have particular importance due to their self-scaling properties and the specialty of the photonic band gap formation with multiple narrowband transmission windows. , A cantor set is a geometric set that has a self-replicating fractal structure that is obtained by the continuous iteration of a particular mathematical set.…”

Optimal design of multilayer optical thin film structure for smart energy saving applications using needle optimization approach

“…Since Eli Yablonovitch and Sajeev John's pioneering work on PCs in 1987 [1,2], there has been a surge of intensive studies to explore the optical properties of PC structure and enormous interest in this field resulting in several investigations into PC fabrication techniques. A number of artificial PCs, including one dimensional (1D), 2D and 3D, have been designed and developed for more than two decades [3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Tunable terahertz filter based on graphene photonic crystals with defective layers

“…Additionally, other sequences have also aroused wide concern. unidirectional ultrabroadband and wide-angle absorption in Octonacci sequence [26], tunable dual-and multi-channels filter in Cantor sequence [27] and the design of all-optical switches in Thue-Morse lattices [28]. The structures above take advantage of quasi-periodic sequences that are different from conventional ones, which can obtain a peak value of transmittance and a very low reflectivity [13,29].…”