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 | |
| Publication status | Published - 1 Aug 2017 |
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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
Cite this
Focusing behavior of 2-dimensional plasmonic conical zone plate. / Mote, Rakesh G.; Minin, Oleg V.; Minin, Igor V.
In: Optical and Quantum Electronics, Vol. 49, No. 8, 271, 01.08.2017.Research output: Contribution to journal › Article
}
TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=85025153651&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85025153651&partnerID=8YFLogxK
U2 - 10.1007/s11082-017-1108-2
DO - 10.1007/s11082-017-1108-2
M3 - Article
VL - 49
JO - Optical and Quantum Electronics
JF - Optical and Quantum Electronics
SN - 0306-8919
IS - 8
M1 - 271
ER -