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(a) Excitation configuration for the dual-color plasmonic lens. Two independent SPPs are launched at each side of the plasmonic lens, and focused into a common focal spot, which is used for nonlinear excitation and probing of nanosized targets. (b) Geometry of objective-based illumination of incident fields and onto the dual-color plasmonic lens. (c) Scanning electron micrograph of a dual-color plasmonic lens and a Si nanoparticle (Si NP) target.
(a) CCD image of the launching and focusing of two independent SPP modes with the plasmonic lens. (b) CCD image of the dual-color contribution () to the TPEF of a R6G solution in methanol. (c) Dual-color TPEF signal as a function of the time delay between and . (d) Intensity profile of the dual-color TPEF signal along the vertical dashed line marked in (b), with a Gaussian FWHM of 0.63 .
CCD image of FWM radiation from a Si nanoparticle at the focus of a dual-color plasmonic lens, with incident light polarized parallel (a) and perpendicular (b) to the optical axis of the lens. (c) FWM signal as a function of the time delay between and . The solid curve is the calculated cross-correlation based on the (Gaussian) pulse widths of the incident pulses. (d) Dependence of the FWM signal on . The solid curve is a guide to the eye.
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