Focusing behavior of 2-dimensional plasmonic conical zone plate

Abstract

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.

Original language	English
Article number	271
Journal	Optical and Quantum Electronics
Volume	49
Issue number	8
DOIs	https://doi.org/10.1007/s11082-017-1108-2
Publication status	Published - 1 Aug 2017

Keywords

Beam focusing
Diffraction limit
Diffractive element
Surface plasmon polariton

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

Access to Document

10.1007/s11082-017-1108-2

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title = "Focusing behavior of 2-dimensional plasmonic conical zone plate",

abstract = "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.",

keywords = "Beam focusing, Diffraction limit, Diffractive element, Surface plasmon polariton",

author = "Mote, {Rakesh G.} and Minin, {Oleg V.} and Minin, {Igor V.}",

year = "2017",

month = aug,

day = "1",

doi = "10.1007/s11082-017-1108-2",

language = "English",

volume = "49",

journal = "Optical and Quantum Electronics",

issn = "0306-8919",

publisher = "Springer New York",

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T1 - Focusing behavior of 2-dimensional plasmonic conical zone plate

AU - Mote, Rakesh G.

AU - Minin, Oleg V.

AU - Minin, Igor V.

PY - 2017/8/1

Y1 - 2017/8/1

N2 - 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.

AB - 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.

KW - Beam focusing

KW - Diffraction limit

KW - Diffractive element

KW - Surface plasmon polariton

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