Journal
OPTICS LETTERS
Volume 33, Issue 14, Pages 1629-1631Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.001629
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In wide-field fluorescence microscopy, illuminating the specimen with evanescent standing waves increases lateral resolution more than twofold. We report a versatile setup for standing-wave illumination in total internal reflection fluorescence microscopy. An adjustable diffraction grating written on a phase-only spatial light modulator controls the illumination field. Selecting appropriate diffraction orders and displaying a sheared (tilted) diffraction grating allows one to tune the penetration depth in very fine steps. The setup achieves 91 nm lateral resolution for green emission. (c) 2008 Optical Society of America.
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