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Generation of midfield concentrated beam arrays using periodic metal annular apertures |
Applied Optics, Vol. 51, Issue 8, pp. 1076-1085 (2012)
http://dx.doi.org/10.1364/AO.51.001076
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Abstract
Generation of minimally diffracting beam arrays in the midfield region using periodic metal annular apertures is investigated. The relations between the patterns of the diffraction fields and the structural parameters of the periodic metal annular aperture are numerically analyzed. Material dependent transmission characteristics are also studied with finite difference time-domain simulation. The results reveal that the beam concentration efficiency and axial intensity uniformity have a trade-off restriction due to strong inter-aperture interference and surface plasmon mediates the transmission efficiency of the periodic annular apertures. The design criteria of the metal annular aperture to achieve the strong and uniform beam arrays are addressed.
© 2012 Optical Society of America
OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(240.6680) Optics at surfaces : Surface plasmons
(170.2945) Medical optics and biotechnology : Illumination design
ToC Category:
Diffraction and Gratings
History
Original Manuscript: August 26, 2011
Revised Manuscript: November 17, 2011
Manuscript Accepted: November 17, 2011
Published: March 6, 2012
Citation
Hwi Kim, Jaebum Cho, Jihwan Park, Seungoh Han, and Sungkyu Seo, "Generation of midfield concentrated beam arrays using periodic metal annular apertures," Appl. Opt. 51, 1076-1085 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-8-1076
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