Focusing behavior of 2-dimensional plasmonic conical zone plate

A conical configuration plasmonic zone plate based on Fresnel zones made up of Au thin film slits is proposed for focusing in the free space with visible illumination. The surface plasmons enable propagation of radiating modes to distances equal to several wavelengths of the illumination field. Thro...

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Bibliographic Details
Published inOptical and quantum electronics Vol. 49; no. 8; pp. 1 - 9
Main Authors Mote, Rakesh G., Minin, Oleg V., Minin, Igor V.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.08.2017
Springer Nature B.V
Subjects
Characterization and Evaluation of Materials
Computer Communication Networks
Computer simulation
Diffraction
Electrical Engineering
Fresnel zones
Illumination
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Plasmons
Plates (structural members)
Propagation modes
Slits
Wave propagation
Diffraction limit
Surface plasmon polariton
Beam focusing
Diffractive element
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Summary:A conical configuration plasmonic zone plate based on Fresnel zones made up of Au thin film slits is proposed for focusing in the free space with visible illumination. The surface plasmons enable propagation of radiating modes to distances equal to several wavelengths of the illumination field. Through numerical simulations, the conical structure found to yield focal spot beating the diffraction barrier encountered by conventional focusing elements. The focal spot size measured as full-width at half-maximum (FWHM) is observed to be as small as 0.31 times the illumination wavelength at the focal distance of 8 wavelength. Moreover, the simple design rules make it possible to predict and control the focal distances accurately.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-017-1108-2