Abstract
We achieve the effective modulation of coupled-resonator-induced transparency (CRIT) in a photonic crystal system which consists of photonic crystal waveguide (PCW), defect cavities, and a multilayer graphene-insulator stack (MGIS). Simulation results show that the wavelength of transparency window can be effectively tuned through varying the chemical potential of graphene in MGIS. The peak value of the CRIT effect is closely related to the structural parameters of our proposed system. Tunable Multipeak CRIT is also realized in the four-resonator-coupled photonic crystal system by modulating the chemical potentials of MGISs in different cavity units. This system paves a novel way toward multichannel-selective filters, optical sensors, and nonlinear devices.
Highlights
The electromagnetically induced transparency (EIT) effect, which is a quantum interference phenomenon that forms a sharp transparency window over a broad transmission spectrum, has a wide range of potential applications in the fields of slow optical propagation, the transfer of quantum correlation, and nonlinear optical processes [1,2,3]
Since the permittivity of multilayer graphene-insulator stack (MGIS) can be effectively modulated by tuning the chemical potential μc of graphene by applying gate voltage, we discussed the transmission spectrum with different values of μc
Since the permittivity of graphene is modulated with the chemical potential, we found that the integral level of the refractive index declined as μc reduced to 0.4 eV
Summary
The electromagnetically induced transparency (EIT) effect, which is a quantum interference phenomenon that forms a sharp transparency window over a broad transmission spectrum, has a wide range of potential applications in the fields of slow optical propagation, the transfer of quantum correlation, and nonlinear optical processes [1,2,3]. The EIT-like effect discovered in the coupled-resonator photonic systems is called coupled-resonator-induced transparency (CRIT). In previous studies, it was theoretically predicted and experimentally demonstrated that the CRIT effect can efficiently provide tunable transparency on the optical chip due to the significant reduction in the threshold power for optical bistability [6,7,8,9,10]. Since its discovery in 2004, graphene, a monolayer of carbon atoms arranged in a two-dimensional (2D) hexagonal lattice, has received considerable attention due to its electrical and thermal properties, as well as unique atomic thickness [11,12].
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