期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 33, 页码 21288-21293出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp05342g
关键词
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资金
- DFG [SPP1391]
We show that background free nonlinear optical imaging of Au nanostructures with a resolution down to 30 nm can be achieved. To attain such performance, an ultrafast laser source (110 fs pulse duration) has been integrated into a parabolic mirror assisted scanning near-field optical microscope. Combining nonlinear hyperspectral imaging and the simultaneously obtained topography, the setup allows one to directly correlate/assign locations with nonlinear signals originating from either second harmonic generation or two-photon excitation processes. The contrast mechanisms of the far-field background free nonlinear optical image are discussed based on the different tip-sample coupling schemes and the selective excitation of the plasmonic modes.
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