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Schematics of the experiment for SPP manipulation. (a) Collinear inverted microscopy in conjunction with an immersion objective lens and multilayer structure glass/Ti/Au/Air. (b) Split polarization with three parameters: , , and , respectively. (c) Excitation mechanism of a double excitation scheme and propagation behavior of SPPs associated with different observation planes.
SPP field distributions imaged by SNOM under different excitation schemes: (a) single excitation, , on focus; (b) single excitation, , on focus; (c) double excitation, , , on focus; and (d) double excitation, , , defocus , where insets represent FDTD maps.
Cross-sectional cut of interference in the case of double excitation scheme with different ratios of the opposite TM sector along the -axis: (a) and (b) , where the period of fringe pattern is increased due to more oblique component of wavevector in the case of .
Simulated intensity distribution of SPPs under triple excitation scheme when the observation plane scanned through the focus with (a) defocus , (b) on focus, and (c) defocus . (d)–(f) represent the corresponding near-field images.
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