Sains Malaysiana 41(11)(2012): 1461–1466

Theoretical Study of Surface Plasmons with Phase Singularities Generated by Evanescent Bessel Beams

(Kajian Teori Plasmon Permukaan dengan Singulariti Fasa yang dijana oleh Alur Bessel Evanesen)

S. Al-Awfi*

Department of Physics, Faculty of Science, Taibah University

P.o.Box 30002, Madinah, Saudi Arabia

Received: 13 June 2012 / Accepted: 02 July 2012

ABSTRACT

We give details about how a surface plasmons with phase singularities can be produced when a Bessel beam light is totally reflected internally at the planar surface of a dielectric on which an infinitesimally thin film has been deposited. The characteristic property of such a light is the exponential decay with distance in a vacuum which can basically provide a two-dimensional surface plasmons with phase singularities with attractive enhancements. Such a phenomenon is governable by altering the incident angle and the order of the Bessel beam.

Keywords: Metallic film; phase singularity; plasmon surface modes

ABSTRAK

Kertas ini membincangkan dengan terperinci bagaimana plasmon permukaan dengan singulariti fasa boleh dihasilkan apabila satu alur cahaya Bessel terpantul sepenuhnya di permukaan satah satu bahan dielektrik yang telah dimendapkan dengan satu lapisan filem yang sangat nipis. Sifat cahaya ini termasuklah pereputan eksponen dengan jarak dalam vakum yang secara asasnya boleh menghasilkan satu permukaan plasmon dua dimensi dengan singulariti fasa dan ini penambahbaikan yang menarik. Fenomena ini boleh dikawal dengan mengubah sudut tuju dan juga tertib alur Bessel tersebut.

Kata kunci: Filem logam; mod permukaan plasmon; singulariti fasa

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*Corresponding author; email: alawfi99@hotmail.com