Improved Slow Light Capacity In Graphene-based Waveguide

Abstract

We have systematically investigated the wideband slow light in two-dimensional material graphene, revealing that graphene exhibits much larger slow light capability than other materials. The slow light performances including material dispersion, bandwidth, dynamic control ability, delay-bandwidth product, propagation loss, and group-velocity dispersion are studied, proving graphene exhibits significant advantages in these performances. A large delay-bandwidth product has been obtained in a simple yet functional grating waveguide with slow down factor c/vg at 163 and slow light bandwidth Δω at 94.4 nm centered at 10.38 μm, which is several orders of magnitude larger than previous results. Physical explanation of the enhanced slow light in graphene is given. Our results indicate graphene is an excellent platform for slow light applications, promoting various future slow light devices based on graphene.

Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide

“…In this structure, the thickness of the silicon substrate and PMMA are set at 200 nm and 50 nm, respectively. Meanwhile, the graphene monolayer is treated as an ultrathin film layer with a thickness of Δ = 1 nm [ 18 , 19 , 20 ]. The permittivity of silicon and PMMA is 11.7 and 2.25, respectively.…”

“…Generally, the effective refractive index decreases with increasing due to the enlarged electric field. In the terahertz region, the surface conductivity of graphene can be simplified into the Drude-like form [ 12 , 19 ]. From the above equations, the real part of the effective refractive index can be approximated as: …”

Graphene-supported manipulation of surface plasmon polaritons in metallic nanowaveguides

“…Graphene, a two-dimensional (2D) material with a single layer of carbon atoms arranged in a honeycomb lattice, has attracted wide attention due to its exceptional optoelectronic properties [22][23][24][25][26][27][28][29][30][31][32][33][34]. The unique properties of this 2D material contain the ultrahigh carrier mobility [>1 × 10 5 cm 2 ∕V • s], extremely wide operating frequency range, versatile tunability by controlling the gate voltage or chemical doping, and compatibility with other photonic elements [23,24].…”

“…These properties make graphene a potential answer for the realization of high-performance photonic and optoelectronic devices. Recently, tremendous graphene photonic devices have been proposed, such as chip-integrated detectors [16], slow-light components [25,29], filters [30], polarizers [26], and nanospasers [27]. By exerting the gate voltage on graphene to control the dissipative loss, especially, the active control of light can be simply achieved in the silicon and photonic crystal waveguides [23,28].…”

A Photonic Crystal Magnetic Field Sensor Using a Shoulder-Coupled Resonant Cavity Infiltrated with Magnetic Fluid

“…PC waveguides combined with novel materials (i.e., magnetic materials and graphene) have been proposed for tuning the slow light [25,26,27,28], which refers to light with a low group velocity, and is expected to become instrumental in enabling applications in quantum computing, ultrafast all-optical information processing, and so on. Meanwhile, because of the high quality factor [29], the PC cavity is a good candidate for realizing narrow-bandwidth filters [30], optical switches [31], cavity quantum electrodynamics [32], and sensors [33,34,35].…”