Plasmonic Nanofocusing and Near-Field Enhancement

To study plasmonic nanofocusing and enhancement of the EM near-fields, the MIM nanorings were coated with a nm-thick layer of Rhodamine 6G (R6G) organic dye. For that, the sample was immersed into 10⁻⁶ M R6G solution in ethanol for 2 h and then rinsed with deionized water. PL from R6G was excited with a donut-shaped radially (or azimuthally) polarized (532 nm) CVB, or with a Gaussian-shaped beam of the same diameter. The pump intensity was fixed at 10 μW/μm² to avoid degradation of emission at least within 2 min under laser irradiation^{30 (link)}. The diameter of the pump CVB in the focal plane of the 0.8-NA dry microscope objective was slightly adjusted by a lens system to fit the size of the MIM nanoring. The PL signal was collected with the same focusing system and analyzed with a home-built confocal system coupled to a grating-type spectrometer (Andor, Shamrock 303i) with a TE-cooled CCD-camera (Andor, Newton). Characteristic PL intensity distributions near the MIM nanorings were captured with a sensitive CCD camera. The sample was arranged on a piezo-positioning system to provide precise alignment of the donut beam with respect to the MIM nanoring.

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Syubaev S.A., Zhizhchenko A.Y., Pavlov D.V., Gurbatov S.O., Pustovalov E.V., Porfirev A.P., Khonina S.N., Kulinich S.A., Rayappan J.B., Kudryashov S.I, & Kuchmizhak A.A. (2019). Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications. Scientific Reports, 9, 19750.

Publication 2019

Shamrock 303i

Ethanol Lens Microscope Rhodamine 6g

Corresponding Organization :

Other organizations : Far Eastern Federal University, Samara National Research University, SASTRA University, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Institute of Automation and Control Processes, Russian Academy of Sciences

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Variable analysis

independent variables

Polarization of the pump beam (donut-shaped radially or azimuthally polarized CVB, or Gaussian-shaped beam)

dependent variables

Photoluminescence (PL) intensity distribution near the MIM nanorings

control variables

Pump intensity (fixed at 10 μW/μm^2)
Diameter of the pump CVB in the focal plane of the 0.8-NA dry microscope objective (slightly adjusted by a lens system to fit the size of the MIM nanoring)
Concentration of Rhodamine 6G (R6G) organic dye solution (10^-6 M)
Immersion time of the sample in the R6G solution (2 h)
Rinsing the sample with deionized water after immersion

positive controls

Not specified

negative controls

Not specified

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