The Field Enhancement of the Graphene Triple-Groove Waveguide

A graphene triple-groove waveguide having the function of field enhancement is proposed and investigated in this letter. The waveguide consists of three grooves with the internal faces partially coated with graphene. The field enhancement can be over 2000 times in the middle groove and the electric field can be extremely confined in the grooves. The influences of the structural parameters on field enhancement are also demonstrated by separately changing the parameters in this letter. Thanks to the tunable carrier density of graphene, the field enhancement can be controlled by adjusting the chemical potential of graphene. Finally, graphene is replaced by gold in triple-groove waveguide to discuss the effect of field enhancement. Furthermore, the structure of this graphene triple-groove waveguide is simple and the waveguide may have a great prospect in photoelectric devices and bio-sensing.

[1]  Peter Uhd Jepsen,et al.  Non-resonant terahertz field enhancement in periodically arranged nanoslits , 2012 .

[2]  H. Bechtel,et al.  Graphene plasmonics for tunable terahertz metamaterials. , 2011, Nature nanotechnology.

[3]  Longzhi Yang,et al.  Characteristics of electro-refractive modulating based on Graphene-Oxide-Silicon waveguide. , 2012, Optics express.

[4]  Michael Scalora,et al.  Electric field enhancement in Énear-zero slabs under TM-polarized oblique incidence , 2012, 1212.1497.

[5]  Filippo Capolino,et al.  Conditions for Electric Field Enhancement in epsilon-near-zero Slabs under TM-Polarized Oblique Incidence , 2013 .

[6]  J F Zhang,et al.  Dielectric loaded graphene plasmon waveguide. , 2015, Optics express.

[7]  Guoxi Wang,et al.  Giant and tunable electric field enhancement in the terahertz regime. , 2014, Optics express.

[8]  S. Jian,et al.  Nanoscale dielectric-graphene-dielectric tunable infrared waveguide with ultrahigh refractive indices. , 2013, Optics express.

[9]  V. Popov,et al.  Tailoring terahertz near-field enhancement via two-dimensional plasmons. , 2011, Physical review letters.

[10]  Stefan A. Maier,et al.  Strongly confined gap plasmon modes in graphene sandwiches and graphene-on-silicon , 2013 .

[11]  Feng Wang,et al.  Gate-Variable Optical Transitions in Graphene , 2008, Science.

[12]  M. Soljavci'c,et al.  Plasmonics in graphene at infrared frequencies , 2009, 0910.2549.

[13]  R. Hillenbrand,et al.  Efficient coupling of light to graphene plasmons by compressing surface polaritons with tapered bulk materials. , 2014, Nano letters.

[14]  F. Guinea,et al.  The electronic properties of graphene , 2007, Reviews of Modern Physics.

[15]  G. Hanson.  Dyadic Green's functions and guided surface waves for a surface conductivity model of graphene , 2007, cond-mat/0701205.

[16]  S. Jian,et al.  Single-mode graphene-coated nanowire plasmonic waveguide. , 2014, Optics letters.

[17]  Lei Wang,et al.  Surface plasmon modes in graphene wedge and groove waveguides. , 2013, Optics express.

[18]  Tie Jun Cui,et al.  On-chip sub-terahertz surface plasmon polariton transmission lines in CMOS , 2015, Scientific Reports.

[19]  D. Gramotnev,et al.  Plasmonics beyond the diffraction limit , 2010 .

[20]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[21]  A. Geim,et al.  Two-dimensional gas of massless Dirac fermions in graphene , 2005, Nature.

[22]  Tie Jun Cui,et al.  Conformal surface plasmons propagating on ultrathin and flexible films , 2012, Proceedings of the National Academy of Sciences.