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  • American Institute of Physics (AIP)  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Near-field scanning optical microscopy in reflection: A study of far-field collection geometry effects (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2924-2929 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and demonstrated two simple and versatile reflection mode near-field scanning optical microscopes (NSOMs). In one scanner far-field collection is coaxial with the NSOM tip, and in the other scanner, the far-field collection is at a 45° angle to the NSOM tip. We quantitatively compare images obtained with the two scanners. While off-axis collection offers a significantly higher signal-to-noise ratio, it also introduces tip shadowing in samples with topographic features larger than approximately 40 nm. The additional contrast from the shadowing further complicates image interpretation and must be considered when performing NSOM in reflection with off-axis collection. In addition, we discuss some general issues that should be considered when designing a reflection NSOM. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147073
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  • 2
    Electronic Resource
    Electronic Resource
    Room-temperature fluorescence characteristics of single dye molecules adsorbed on a glass surface (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7474-7485 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements of the total fluorescence and fluorescence spectra from single carbocyanine dye molecules (DiIC12) as a function of time reveal a wide range of phenomena. Discrete jumps in the fluorescence intensity from single molecules on a glass surface have been observed with correlation times spanning several orders of magnitude (1 ms–10 s). We propose a model for these fluctuations in which two or more ground state potential minima are accessed by twists of the chromophore backbone that alter the quantum efficiency of emission as well as the emission spectrum. Monte Carlo simulations based on this model are shown which qualitatively match experimental data. In addition, we observed emission spectra which range in shape from narrow, well-separated vibronic bands to a broad, featureless band. The distribution of emission parameters from different molecules, not obtained from ensemble measurements, indicates an abundance of distinct nanoenvironments of the glass surface sampled by the adsorbed molecules. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477370
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