期刊
LASER PHYSICS LETTERS
卷 14, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1612-202X/aa5b08
关键词
two-photon fluorescence; local field effects; organic microparticles; second harmonic generation
资金
- RSCF [16-42-02024]
We discuss photonic effects in arrays of frustum-shaped organic microstructures prepared from organic orange dye composed on a solid substrate by self-assembling technique. We demonstrate that such structures reveal strong amplification of second-order nonlinear optical response, including optical second harmonic generation (SHG) and two-photon fluorescence (TPF), as compared to that of a continuous film. This is associated with a strong light localization in microstructures composed of high refractive index material. The TPF and SHG power dependencies show that the observed effects are governed by high second-order nonlinearity of the dye damped by a strong absorption. FDTD calculations confirm that the mechanism of the light localization inside organic frustums can be in the form of whispering gallery modes excitation.
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