Near-field optical and shear-force microscopy of single fluorophores and DNA molecules


Garcia-Parajo, M.F. and Veerman, J.A. and Ruiter, A.G.T. and Hulst, N.F. van (1998) Near-field optical and shear-force microscopy of single fluorophores and DNA molecules. Ultramicroscopy, 71 (1-4). pp. 311-319. ISSN 0304-3991

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Abstract:Photodynamics of individual fluorescence molecules has been studied using an aperture-type near-field scanning optical microscope with two channel fluorescence polarisation detection and tuning fork shear-force feedback. The position of maximum fluorescence from individual molecules could be localised with an accuracy of 1 nm. Dynamic processes such as translational and rotational diffusion were observed for molecules adsorbed to a glass surface or embedded in a polymer host. The in-plane molecular dipole orientation could be determined by monitoring the relative contribution of the fluorescence signal in the two perpendicular polarised direct:ions. Rotational dynamics was investigated o­n 10 ms-1000 s timescale. Shear-force phase feedback was used to obtain topographic imaging of DNA fragments, with a lateral and vertical resolution comparable to scanning force microscopy. A DNA height of 1.4 nm has been measured, an indication of the non-disturbing character of the shear force mechanism.
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Copyright:© 1998 Elsevier
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Metis ID: 128615