期刊
APPLIED PHYSICS LETTERS
卷 79, 期 17, 页码 2681-2683出版社
AMER INST PHYSICS
DOI: 10.1063/1.1412433
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Near-field microscopy and spectroscopy of third-harmonic generation and two-photon excitation are demonstrated on a subdiffraction-limited scale. Near-field measurements of both the intensity dependence and the spectral dependence are performed on nonlinear organic nanocrystals of 4-(N, N-diethylamino)-beta -nitrostyrene. The in-plane local anisotropies of third-order susceptibilities are observed, which is revealed to be associated to two-photon allowed pi -electron transition. The local spectra exhibit the crystal symmetry on a nanometric scale. (C) 2001 American Institute of Physics.
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