Abstract
Group delay of the optical pulse reflected from the structure composed of graphene and one dimensional photonic crystal (1D PC) is studied. It is shown that the large negative group delay in this configuration can be realized due to the excitation of the optical Tamm state (OTS) at a graphene-dielectric interface. The reflected group delay can be enlarged negatively and can be switched from positive to negative or vice versa. We show that the conductivity of graphene has a significant influence on reflected group delay, making the graphene-PC structure be a good candidate for dynamic tunable optical delay device in the THz frequencies. Furthermore, the influences of the relaxation time of graphene, the incident angel, and the dispersion characteristics of top layer on group delay are clarified.
Highlights
The group delay of propagation of electromagnetic wave traversing through a media together with delay control techniques has attracted much attention since it offers many potential applications for optical communication [1, 2]
Ouchani et al have researched possibility of superluminal and negative delay times for electromagnetic wave propagation in a linear and passive periodic structure consisting of alternating isotropic and anisotropic media [9]
We will discuss the characteristics of reflected group delay in the air-graphene-top layer 1D PC composite structure
Summary
The group delay of propagation of electromagnetic wave traversing through a media together with delay control techniques has attracted much attention since it offers many potential applications for optical communication [1, 2]. The group delay can be flexibly manipulated by tuning external voltage For this reason, Bragg cavities consist of graphene and optical lattice seems to be a potential structure for achieving and controlling tunable group delay. The effects of slow light and fast light can be continuously tuned in the THz regime We believe it has potential and important applications in all-optical communication systems, especially for the design of optical delay device
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