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We isolate nonlinear KTiOPO4 (KTP) nanocrystals and study them by second-harmonic generation (SHG) microscopy and atomic force microscopy (AFM). With both polarization analysis and defocused imaging of the emitted second harmonic field, we extract the Euler angles of the crystalline axes of a single nanocrystal. The nonlinear features and photostability of a single KTP nanocrystal make it a good candidate...
The finding of nonlinear nanometric-sized probes is of key importance for the development of nonlinear microscopy in nanosciences and biology. We isolate nonlinear KTiOPO4 nanocrystals with remarkable photostability in second-harmonic generation under femtosecond infrared laser light excitation. Their size distribution is determined using dynamic light scattering and atomic force microscopy. With...
In this paper, we propose the inorganic nonlinear KTiOPO4 (KTP) crystals of nanometric size with a strong second-harmonic coherent emission when illuminated by femtosecond infrared pulses. The non-resonant character of the nonlinear interaction prevents from any photobleaching or blinking. The signal therefore exhibits a perfect photostability. We show that analysis of coherently emitted non-linear...
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