Diffraction regimes of single holes.

We investigate both experimentally and theoretically the far-field diffraction patterns of single circular apertures as a function of their diameters d and at a given illumination wavelength λ. We observe the transition between the well-known pseudoscalar regime of large holes (d≫λ) and the less-known vectorial regime of subwavelength ones (d≪λ). Four different diffraction regimes are identified for different d/λ regions, each one with its polarization dependence. A thorough comparison with a theoretical model, which takes into account both finite hole size and the dielectric properties of the metal, allows us to explain and understand the physical processes leading to this behavior. Our results reveal the subtle interplay between two competing factors, one related to polarization symmetries associated with surface-plasmon excitations and the other originating in the coupling of the field to the waveguide mode of the aperture.

[1]  G. Leuchs,et al.  Waveguide properties of single subwavelength holes demonstrated with radially and azimuthally polarized light , 2007, 0708.1473.

[2]  Romain Quidant,et al.  Self -induced back-action optical trapping of dielectric nanoparticles , 2009 .

[3]  Ann Roberts,et al.  Electromagnetic theory of diffraction by a circular aperture in a thick, perfectly conducting screen , 1987 .

[4]  F. García-Vidal,et al.  Surface electromagnetic field radiated by a subwavelength hole in a metal film. , 2010, Physical review letters.

[5]  Hervé Rigneault,et al.  Enhancement of single-molecule fluorescence detection in subwavelength apertures. , 2005, Physical review letters.

[6]  P. Nordlander,et al.  Bethe-hole polarization analyser for the magnetic vector of light , 2011, Nature communications.

[7]  Thomas W. Ebbesen,et al.  Optical transmission properties of a single subwavelength aperture in a real metal , 2004 .

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

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

[10]  Khaled Karrai,et al.  Far field characterization of diffracting circular apertures , 1995 .

[11]  T. Ebbesen,et al.  Efficiency and finite size effects in enhanced transmission through subwavelength apertures. , 2008, Optics express.

[12]  Andrew G. Glen,et al.  APPL , 2001 .

[13]  Hervé Rigneault,et al.  Surface plasmon excitation on a single subwavelength hole in a metallic sheet. , 2005, Applied optics.

[14]  Mikael Käll,et al.  Green's tensor calculations of plasmon resonances of single holes and hole pairs in thin gold films , 2008 .

[15]  F. García-Vidal,et al.  Theory on the scattering of light and surface plasmon polaritons by arrays of holes and dimples in a metal film , 2008, 0807.3711.

[16]  S. Huant,et al.  Extension of Bethe's diffraction model to conical geometry: Application to near-field optics , 2001, 1002.0951.

[17]  R. Wannemacher Plasmon-supported transmission of light through nanometric holes in metallic thin films , 2001 .

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

[19]  F. D. Abajo,et al.  Light transmission through a single cylindrical hole in a metallic film. , 2002 .

[20]  H. Bethe Theory of Diffraction by Small Holes , 1944 .

[21]  Dong-Jae Shin,et al.  Diffraction by a subwavelength-sized aperture in a metal plane. , 2001, Journal of the Optical Society of America. A, Optics, image science, and vision.

[22]  Luis Martín-Moreno,et al.  Light passing through subwavelength apertures , 2010 .

[23]  E. Betzig,et al.  Near-Field Optics: Microscopy, Spectroscopy, and Surface Modification Beyond the Diffraction Limit , 1992, Science.

[24]  Yehuda Leviatan,et al.  Study of near-zone fields of a small aperture , 1986 .

[25]  S. Turner,et al.  Zero-Mode Waveguides for Single-Molecule Analysis at High Concentrations , 2003, Science.

[26]  E. Popov,et al.  Single-scattering theory of light diffraction by a circular subwavelength aperture in a finitely conducting screen. , 2007, Journal of the Optical Society of America. A, Optics, image science, and vision.

[27]  Sergio G. Rodrigo,et al.  In the diffraction shadow: Norton waves versus surface plasmon polaritons in the optical region , 2009, 0909.4328.