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Numerical analysis of subwavelength focusing using a silicon cylinder
D.A. Savelyev, S.N. Khonina

 

Samara State Aerospace University,
Image Processing Systems Institute, Russian Academy of Sciences

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Full text of article: Russian language.

DOI: 10.18287/0134-2452-2014-38-4-638-642

Pages: 638-642.

Abstract:
The analysis of the impact of variations in the size of a silicon micro-cylinder with a subwavelength radius on the diffraction of circularly polarized Gaussian beams was performed using a finite-difference time-domain (FDTD) method. It is numerically shown that a Gaussian beam can be focused near the surface of the element in a light spot, whose size at full-width at half-maximum of the intensity is 0.25λ. It is demonstrated that the silicon cylinder illuminated by a laser beam with a vortex phase singularity of the first order forms a light spot, with its central part mainly formed by the longitudinal component of the electric field. (FWHM = 0.29λ).

Key words:
diffractive optics, optical vortices, binary optics, FDTD-method, micro-cylinder with subwavelength radius, sharp focusing of light, circular polarization, Meep software.

Citation:
Savelyev DA, Khonina SN. Numerical analysis of subwavelength focusing using a silicon cylinder. Computer Optics 2014; 38(4): 638-642. DOI: 10.18287/0134-2452-2014-38-4-638-642.

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