Abstract

We investigated the characteristics of the near- and far-field regions of the interference for nano-metallic double-slits using a two-dimensional finite-difference time-domain (FDTD) method. We have found that the patterns in the near-field region have a phase difference of �? with respect to those in the far-field region. A boundary, which separates the interference patterns of the two regions exists as a half circle and grows as the distance between the two slits increase. It is also found that evanescent waves can be enhanced and confined by coating the double-slit with a dielectric cladding.

© 2004 Optical Society of America

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J. Appl. Phys. (1)

L. Novotny, B. Hecht, and D. W. Pohl, ???Interference of locally excited surface plasmons,??? J. Appl. Phys. 81, 1798 (1997).
[CrossRef]

J. Opt. Soc. Am. A (1)

Nature (1)

T.W. Ebessen, H.J. Lezec, H.F. Ghaemi, and T. Thio, ???Extraordinary optical transmission through subwavelength hole arrays,??? Nature 391, 667 (1998).
[CrossRef]

Opt. Commun. (1)

P.N Stavrinou, and L. Solymar, ???The propagation of electromagnetic power through subwavelength slits in a metallic grating,??? Opt. Commun. 206, 217 (2002).
[CrossRef]

Opt. Express (2)

Phys. Rev. B (3)

E. Popov, M. Nevière, S. Enoch, and R. Reinisch, ???Theory of light transmission through subwavelength periodic hole arrays,??? Phys. Rev. B 62, 16100 (2000).
[CrossRef]

F.I. Baida and D. Van Labeke, ???Three-dimensional structures for enhanced transmission through a metallic film: Annular aperture arrays,??? Phys. Rev. B 67, 155314 (2003).
[CrossRef]

J.M. Steele, C.E. Moran, A. Lee, C.M. Aguirre, and N.J. Halas, ???Metallodielectric gratins with subwavelength slots: Optical properties,??? Phys. Rev. B 68, 205103 (2003).
[CrossRef]

Phys. Rev. E (1)

Hugo.F. Schouten, Taco D. Visser, Daan Lenstra, and Hans Blok, ???Light transmission through a subwavelength slit: Waveguiding and optical vortices,??? Phys. Rev. E 67, 36608 (2003).
[CrossRef]

Phys. Rev. Lett. (4)

Y. Takakura, ???Optical Resonance in a Narrow Slit in a Thick Metallic Screen,??? Phys. Rev. Lett. 86, 5601 (2001).
[CrossRef]

J.A. Porto, F.J. García-Vidal, and J.B. Pendry, ???Transmission Resonances on Metallic Gratings with Very Narrow Slits,??? Phys. Rev. Lett. 83, 2845 (1999)
[CrossRef]

L. Martín-Moreno, F.J. García-Vidal, H.J. Lezec, K.M. Pellerin, T. Thio, J.B. Pendry, and T.W. Ebbesen, ???Theory of Extraordinary Optical Transmission through Subwavelength Hole Arrays,??? Phys. Rev. Lett. 86, 1114 (2001)
[CrossRef]

Qing Cao and Philippe Lalanne, ???Negative Role of Surface Plasmons in the Transmission of Metallic Gratings with Very Narrow Slits,??? Phys. Rev. Lett. 88, 57403 2002).
[CrossRef]

Rep. Prog. Phys. (1)

C.J. Boukamp, ???Diffraction Theory,??? Rep. Prog. Phys. 17, 35 (1954).
[CrossRef]

Other (2)

M. Born and E. Wolf, Principles of Optics, 7th ed. (Cambridge University Press, Cambridge 1999).

A. Taflove, S. C. Hagness, Computational Electrodynamics: The Finite-Difference Time-Domain Method, 2nd ed. (Artech House, Boston 2000).

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