Download Second-order nonlinear optical characterization techniques: by Thierry Verbiest PDF

By Thierry Verbiest

Although chemists, biochemists, biologists, and fabric scientists are usually drawn to utilizing nonlinear optical strategies for characterizing their samples, they seldom have the required historical past to use those equipment. Designed for nonspecialists, Second-Order Nonlinear Optical Characterization innovations: An Introduction specializes in the opportunity of second-order nonlinear optics as a robust characterization instrument. averting large mathematical info, this multidisciplinary ebook doesn't require a heritage in complex arithmetic or physics.

After introducing linear optics from the viewpoint of polarizability and linear susceptibility, the authors hide incoherent second-harmonic iteration. They then care for the learn of surfaces and interfaces, exploiting the intrinsic floor sensitivity of second-harmonic new release and sum-frequency new release. the ultimate bankruptcy discusses second-order imaging suggestions, together with confocal microscopy and two-photon excited fluorescence microscopy.

Accessible to quite a lot of scientists, this concise booklet stresses the reliability of nonlinear optical methods for probing surfaces and interfaces. Drawing at the perception provided within the textual content, scientists from many disciplines can now sincerely comprehend and use second-order nonlinear optical methods.

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Additional info for Second-order nonlinear optical characterization techniques: an introduction

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There is no such condition for odd-order techniques. Therefore, the combination of an odd-order (no condition) with an even-order technique (noncentrosymmetry condition) reveals the combined information of a general nature (like presence) in combination with symmetry information (noncentrosymmetry when a signal is observed, centrosymmetry when no odd-order response is found). A particularly nice example of this combination was demonstrated with amphiphilic nonlinear optical chromophores (NLOphores) dispersed in membranes for nonlinear optical microscopy (Moreaux et al.

However, unlike HRS it is not possible to determine molecular symmetries. Furthermore, octupolar and ionic molecules cannot be measured by EFISH since orientation in an electric field is not possible for these systems. Although “hyper-Rayleigh” scattering does not refer to any specific higher-order scattering, it is usually reserved for the scattering at the second-harmonic frequency (Clays and Persoons 1991). Since there is no static field involved, hyper-Rayleigh scattering is a second-order nonlinear optical effect, governed by the second-order nonlinear susceptibility.

In principle, this should discriminate in the spectral domain between useful signal and useless stray 38 Second-order nonlinear optical characterization techniques: An introduction light. However, it has been pointed out that apart from pure HRS, another source of incoherent photons at exactly the second-harmonic wavelength is possible. This is multiphoton fluorescence (either Stokes or anti-Stokes two-photon or three-photon fluorescence; Flipse et al. 1995). Because this can be an additional contribution to the HRS signal, it can result in a systematic overestimation of the first hyperpolarizability.

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