Polarization-selective Excitation of Dye Luminescence on a Gold Film by Structured Ultrashort Laser Pulses |
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| Authors: | P. A. Danilov I. N. Saraeva S. I. Kudryashov A. P. Porfirev A. A. Kuchmizhak A. Yu. Zhizhchenko A. A. Rudenko S. F. Umanskaya D. A. Zayarny A. A. Ionin S. N. Khonina |
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| Affiliation: | 1.Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia;2.National Nuclear Research University MEPhI (Moscow Engineering Physics Institute),Moscow,Russia;3.Samara National Research University,Samara,Russia;4.Image Processing Systems Institute, Federal Research Center Crystallography and Photonics,Russian Academy of Sciences,Samara,Russia;5.Institute for Automation and Control Processes, Far Eastern Branch,Russian Academy of Sciences,Vladivostok,Russia;6.Far Eastern Federal University,Vladivostok,Russia |
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| Abstract: | Donut-shaped visible (515 nm) femtosecond laser pulses with linear, radial and azimuthal polarizations after tight focusing (numerical aperture NA = 0.65) have been used for spectrally adjusted excitation of plasmonenhanced rhodamine 6G dye luminescence on the surface of a nanocrystalline 45-nm thick gold film with its plasmon resonance near the laser line. Significant luminescence output increments—1.7-fold for radial polarization compared to the azimuthal one, and almost 3-fold—compared to the linear one, have been observed. This effect is related to significant transformation of the transverse electrical field component into longitudinal one for radial polarization (up to 33% in intensity, according to our calculations), and corresponding increase in excitation efficiency of plasmons in the smaller nanocrystallites throughout the film. |
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