Compact and high-resolution plasmonic wavelength demultiplexers based on Fano interference.

Using strong couplings of different Fabry-Perot (FP) resonators in metal-insulator-metal waveguides, a compact plasmonic wavelength demultiplexer is numerically demonstrated with high wavelength resolution. In the demultiplexer, it is found that new right-angle resonators emerge with bandwidth narrower than that of the isolated FP resonators. These narrowband right-angle resonators interfere with the broadband FP resonators, resulting in Fano-line shapes in the transmission spectra. Consequently, these sharp and asymmetric Fano-line shapes considerably increase the resolution of wavelength demultiplexing, which is significantly narrower than the full width of the isolated FP resonator.

[1]  Sergey I. Bozhevolnyi,et al.  Theoretical analysis of dielectric-loaded surface plasmon-polariton waveguides , 2007 .

[2]  Yan Pennec,et al.  Modeling of two-dimensional nanoscale Y-bent plasmonic waveguides with cavities for demultiplexing of the telecommunication wavelengths , 2009 .

[3]  Y. Kivshar,et al.  Nonlinear nanofocusing in tapered plasmonic waveguides. , 2010, Physical review letters.

[4]  Xian-Shi Lin,et al.  Tooth-shaped plasmonic waveguide filters with nanometeric sizes. , 2008, Optics letters.

[5]  Jurriaan Schmitz,et al.  A silicon-based electrical source of surface plasmon polaritons. , 2010, Nature materials.

[6]  J. Dionne,et al.  Near-field visualization of strongly confined surface plasmon polaritons in metal-insulator-metal waveguides. , 2008, Nano letters.

[7]  P. Brevet,et al.  Fano profiles induced by near-field coupling in heterogeneous dimers of gold and silver nanoparticles. , 2008, Physical review letters.

[8]  U. Fano.  Effects of Configuration Interaction on Intensities and Phase Shifts , 1961 .

[9]  A. Reiserer,et al.  Subwavelength broadband splitters and switches for femtosecond plasmonic signals. , 2010, Optics express.

[10]  Liesbet Lagae,et al.  Electrical detection of confined gap plasmons in metal-insulator-metal waveguides , 2009 .

[11]  Shanhui Fan,et al.  Sharp asymmetric line shapes in side-coupled waveguide-cavity systems , 2002 .

[12]  D. Sarid.  Long-Range Surface-Plasma Waves on Very Thin Metal Films , 1981 .

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

[14]  W. Barnes,et al.  Surface plasmon subwavelength optics , 2003, Nature.

[15]  Shanhui Fan,et al.  Bends and splitters in metal-dielectric-metal subwavelength plasmonic waveguides , 2005 .

[16]  He-Zhou Wang,et al.  The transmission characteristics of surface plasmon polaritons in ring resonator. , 2009, Optics express.

[17]  Thomas W. Ebbesen,et al.  Surface-plasmon circuitry , 2008 .

[18]  T. Ebbesen,et al.  Channel plasmon subwavelength waveguide components including interferometers and ring resonators , 2006, Nature.

[19]  Xu Guang Huang,et al.  A wavelength demultiplexing structure based on metal-dielectric-metal plasmonic nano-capillary resonators. , 2010, Optics express.