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Simulation of laser light focusing with two-layer dielectric microcyl-inders
A.A. Savelyeva 1,2, E.S. Kozlova 1,2

1 IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS,
443001, Samara, Russia, Molodogvardeyskaya 151,
2 Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34

 PDF, 1311 kB

DOI: 10.18287/2412-6179-CO-820

Pages: 208-213.

Full text of article: Russian language.

Abstract:
Focusing of a linearly polarized laser beam of wavelength 633 nm with two-layer dielectric microcylinders of a circular cross-section and 2-um diameter was simulated using a finite-difference time-domain (FDTD) method, implemented using the FullWAVE software. It was shown that using a cladding whose refractive index (1.8 or 1.9) is higher than that of the core (1.45), it is possible to increase the depth of focus by a factor of 2.57 multiplied by the incident wavelength and shift the focal spot position along the optical axis away from the microcylinder boundary. It was also shown that parameters of the microcylinder could be chosen in such a way that a tighter focal spot was generated, with its full width at half maximum of intensity being 2.27 of the incident wavelength. The intensity at this focus was shown to be 1.4 times higher than that at the focus generated with a homogeneous microcylinder.

Keywords:
two-layer dielectric microcylinder, photonic nanojet, tight focusing, FDTD-method.

Citation:
Savelyeva AA, Kozlova ES. Simulation of laser light focusing with two-layer dielectric microcylinders. Computer Optics 2021; 45(2): 208-213. DOI: 10.18287/2412-6179-CO-820.

Acknowledgements:
This work was supported by the Council for Grants of the President of the Russian Federation (grant MK-329.2020.2) and by the Development Program 2015-2024 of Vernadsky Crimean Federal University (grant ВГ 02/2020).

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