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Phys Rev Lett. 2007 Nov 30;99(22):228105. Epub 2007 Nov 30.

High-resolution confocal microscopy by saturated excitation of fluorescence.

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  • 1Department of Applied Physics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 Japan. fujita@ap.eng.osaka-u.acjp

Abstract

We demonstrate the use of saturated excitation in confocal fluorescence microscopy to improve the spatial resolution. In the proposed technique, we modulate the excitation intensity temporally and detect the harmonic modulation of the fluorescence signal which is caused by the saturated excitation in the center of the laser focus. Theoretical and experimental investigations show that the demodulated fluorescence signal is nonlinearly proportional to the excitation intensity and contributes to improve the spatial resolution in three dimensions beyond the diffraction limit of light.

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