Sharp resonant focusing of light by a dielectric cylinder with square cross-section and cube
D. A. Kozlovab, E. S. Kozlovaab, V. V. Kotlyarab
a Samara National Research University, Samara, Russia
b Image Processing Systems Institute îf the RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Samara, Russia
In this paper a research on conditions for resonance excitation in a homogeneous dielectric cylinder with square cross-section is conducted using a FDTD-method. It is shown that in a cylinder with square cross-section resonant modes similar to whispering gallery modes can be excited, which allows one to reduce the transverse dimensions of the focal spot. FDTD method demonstrates an acceptable accuracy of the resonant mode detection. A similar result is obtained for a cube on a dielectric substrate: it is possible to achieve the reduction of the transverse dimensions of the focal spot by changing the corresponding cube size.
dielectric cylinder, resonance, light focusing.
|Ministry of Education and Science of the Russian Federation
|Russian Foundation for Basic Research
|This work was supported by the Ministry of Education and Science of the Russian Federation, the Russian President's grant for support of leading scientific schools (NSH-9498.2016.9) and RFBR 14-29-07133 grants 15-07-01174, 15-37-20723, 15-47 -02,492, 16-29-11698.
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D. A. Kozlov, E. S. Kozlova, V. V. Kotlyar, “Sharp resonant focusing of light by a dielectric cylinder with square cross-section and cube”, Computer Optics, 40:4 (2016), 431–438
Citation in format AMSBIB
\by D.~A.~Kozlov, E.~S.~Kozlova, V.~V.~Kotlyar
\paper Sharp resonant focusing of light by a dielectric cylinder with square cross-section and cube
\jour Computer Optics
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