Efficiently squeezing near infrared light into a 21 nm-by-24 nm nanospot.

Recent work demonstrated light transmission through deep subwavelength slits or coupling light into waveguides with deep subwavelength dimension only in one direction. In this paper, we propose an approach to squeeze light (lambda = 1550 nm) from a dielectric waveguide into a deep subwavelength spot. Vertical confinement is achieved by efficiently coupling light from a dielectric waveguide into a 20-nm metal-dielectric-metal plasmonic waveguide. The horizontal dimension of the plasmonic waveguide is then tapered into 20 nm. Numerical simulation shows that light fed from a dielectric waveguide can be squeezed into a 21 nm-by-24 nm spot with efficiency 62%.

[1]  O. Martin,et al.  Resonant Optical Antennas , 2005, Science.

[2]  G. Veronis,et al.  Guided subwavelength plasmonic mode supported by a slot in a thin metal film. , 2005, Optics letters.

[3]  J. Pearson,et al.  Subwavelength focusing and guiding of surface plasmons. , 2005, Nano letters.

[4]  G. Veronis,et al.  Modes of Subwavelength Plasmonic Slot Waveguides , 2007, Journal of Lightwave Technology.

[5]  Dmitri K. Gramotnev,et al.  Adiabatic and nonadiabatic nanofocusing of plasmons by tapered gap plasmon waveguides , 2006 .

[6]  M. Stockman,et al.  Nanofocusing of optical energy in tapered plasmonic waveguides. , 2004, Physical review letters.

[7]  E. Ozbay.  Plasmonics: Merging Photonics and Electronics at Nanoscale Dimensions , 2006, Science.

[8]  Michal Lipson,et al.  Subwavelength confinement in an integrated metal slot waveguide on silicon. , 2006, Optics letters.

[9]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[10]  H. J. Lezec,et al.  The optical response of nanostructured surfaces and the composite diffracted evanescent wave model , 2006 .

[11]  R A Linke,et al.  Beaming Light from a Subwavelength Aperture , 2002, Science.

[12]  P. Ginzburg,et al.  Plasmonic transmission lines: from micro to nano scale with lambda/4 impedance matching. , 2007, Optics express.

[13]  Eric Bourillot,et al.  Squeezing the Optical Near-Field Zone by Plasmon Coupling of Metallic Nanoparticles , 1999 .

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

[15]  H. Lezec,et al.  Multiple paths to enhance optical transmission through a single subwavelength slit. , 2003, Physical review letters.

[16]  H. Lezec,et al.  Extraordinary optical transmission through sub-wavelength hole arrays , 1998, Nature.

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

[18]  Shanhui Fan,et al.  Theoretical investigation of compact couplers between dielectric slab waveguides and two-dimensional metal-dielectric-metal plasmonic waveguides. , 2007, Optics express.

[19]  Ewold Verhagen,et al.  Nanofocusing in laterally tapered plasmonic waveguides. , 2008, Optics express.

[20]  Pavel Ginzburg,et al.  Gap plasmon polariton structure for very efficient microscale-to-nanoscale interfacing. , 2006, Optics letters.