Sharp focusing of laser light by multilayer cylinders with circular cross-section

E. S. Kozlova

doi:10.1117/12.2315780

26 April 2018 Sharp focusing of laser light by multilayer cylinders with circular cross-section

E. S. Kozlova

Proceedings Volume 10717, Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV; 107170M (2018) https://doi.org/10.1117/12.2315780
Event: Saratov Fall Meeting 2017, 2017, Saratov, Russian Federation

Abstract

In this paper, the focusing of laser light at 532 nm by dielectric cylinders with a metal shells is studied by using COMSOL Multiphysics. The analysis of cylinder design which proposed multilayered shell shows that a microcylinder with a gold-silver (or silver-gold) shell can improve the focusing process, especially in the case of TM polarization. The microcylinder with thin internal silver layer of 1 nm and outside gold layer of 9 nm focus TE-polarized light to nanojet with maximal intensity of 5.65 a.u., full width and full length at half maximum of intensity of of 0.39λ and 0.72λ, respectively.

Citation Download Citation

E. S. Kozlova "Sharp focusing of laser light by multilayer cylinders with circular cross-section", Proc. SPIE 10717, Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV, 107170M (26 April 2018); https://doi.org/10.1117/12.2315780

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