Theory of enhanced optical transmission through a metallic nano-slit surrounded with asymmetric grooves under oblique incidence.

A metallic nano-slit surrounded with asymmetric grooves is proposed as the plasmonic concentrator for oblique incident light. A theoretical model based on the surface plasmon polariton (SPP) coupled-mode method is derived for the extraordinary optical transmission (EOT) through such a structure under oblique incidence. The model is quantitatively validated with the finite element method. With the model, the physical insight of the EOT is then interpreted, i.e., the major contributions to the transmission include the vertical Fabry-Perot resonance of the slit, and the interference among slit modes excited by the incident light, by SPPs generated from groove arrays and their first-order reflections. This is quite different from the EOT through a nano-slit surrounded with symmetric grooves under normal incidence.

[1]  Byoungho Lee,et al.  Off-axis directional beaming of optical field diffracted by a single subwavelength metal slit with asymmetric dielectric surface gratings , 2007 .

[2]  Byoungho Lee,et al.  Plasmonic Light Beaming Manipulation and its Detection Using Holographic Microscopy , 2010, IEEE Journal of Quantum Electronics.

[3]  T. Ebbesen,et al.  Analysis of the transmission process through single apertures surrounded by periodic corrugations. , 2004, Optics express.

[4]  Anshi Xu,et al.  A quantitative theory and the generalized Bragg condition for surface plasmon Bragg reflectors. , 2010, Optics express.

[5]  T. Ebbesen,et al.  Light in tiny holes , 2007, Nature.

[6]  J. Pendry,et al.  Evanescently coupled resonance in surface plasmon enhanced transmission , 2001 .

[7]  Yunlong Sheng,et al.  Interference of surface waves in a metallic nanoslit. , 2007, Optics express.

[8]  G. '. 't Hooft,et al.  On the phase of plasmons excited by slits in a metal film. , 2006, Optics express.

[9]  S. Brueck,et al.  Enhancing the signal-to-noise ratio of an infrared photodetector with a circular metal grating. , 2008, Optics Express.

[10]  G. '. 't Hooft,et al.  Giant optical transmission of a subwavelength slit optimized using the magnetic field phase. , 2007, Physical review letters.

[11]  R A Linke,et al.  Enhanced light transmission through a single subwavelength aperture. , 2001, Optics letters.

[12]  Anshi Xu,et al.  Interference and horizontal Fabry-Perot resonance on extraordinary transmission through a metallic nanoslit surrounded by grooves. , 2010, Optics letters.

[13]  Scattering of surface plasmons by one-dimensional periodic nanoindented surfaces , 2005, cond-mat/0508041.

[14]  Anshi Xu,et al.  Phase shift of plasmons excited by slits in a metal film illuminated by oblique incident TM plane wave , 2008, SPIE/OSA/IEEE Asia Communications and Photonics.

[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]  J P Hugonin,et al.  Use of grating theories in integrated optics. , 2001, Journal of the Optical Society of America. A, Optics, image science, and vision.

[18]  P Lalanne,et al.  Approximate model for surface-plasmon generation at slit apertures. , 2006, Journal of the Optical Society of America. A, Optics, image science, and vision.

[19]  D. Lynch,et al.  Handbook of Optical Constants of Solids , 1985 .

[20]  F. García-Vidal,et al.  Enhanced transmission from a single subwavelength slit aperture surrounded by grooves on a standard detector , 2009 .

[21]  Chih-Kung Lee,et al.  Directional light beaming control by a subwavelength asymmetric surface structure. , 2007, Optics express.

[22]  Yanxia Cui,et al.  A theoretical re-examination of giant transmission of light through a metallic nano-slit surrounded with periodic grooves. , 2009, Optics express.

[23]  P. Lalanne,et al.  A microscopic view of the electromagnetic properties of sub-λ metallic surfaces , 2009 .

[24]  P. Lalanne,et al.  Surface Plasmon Generation by Subwavelength Isolated Objects , 2008, IEEE Journal of Selected Topics in Quantum Electronics.