Surface-enhanced hyper-raman scattering from SO32− adsorbed on Ag powder

Murphy, Daniel V.; Raben, K.U. Von; Chang, Richard K.; Dorain, Paul B.

doi:10.1016/0009-2614(82)83457-x

Cited by 86 publications

(34 citation statements)

References 23 publications

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“…After the first report on SEHRS measured from SO 3 2 on silver powder, 4 SEHRS experiments were performed on pyridine and different dye molecules using Q-switched or mode-locked Nd : YAG laser excitation at 1064 nm. 5 -10 In most experiments, silver or gold nanoparticles in aqueous solution or 'rough' silver electrodes served as enhancing nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced hyper Raman scattering in silver colloidal solutions

Kneipp

2005

J Raman Spectroscopy

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We report surface-enhanced hyper Raman scattering (SEHRS) from molecules in silver colloidal solutions using high repetition rate mode-locked picosecond excitation at 1064 nm. SEHRS was is studied under non-resonant and resonant conditions by choosing adenine and crystal violet as test molecules. Compared with its SERS spectrum, the SEHRS spectrum of adenine displays strong 'new' lines, which, in agreement with theory, in most cases also show up in the infrared absorption spectrum. We also explore the capability of SEHRS for trace detection and demonstrate detection and identification of crystal violet based on its SEHRS signals down to nanomolar concentrations.

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Section: Introductionmentioning

confidence: 99%

Surface‐enhanced hyper Raman scattering in silver colloidal solutions

Kneipp

2005

J Raman Spectroscopy

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“…Interestingly, HRS benefits even to a greater extent from the high local optical fields than normal Raman scattering does in the case of SERS, because of its nonlinear dependence on the (enhanced) excitation field. SEHRS has been demonstrated since the early days of SERS (13)(14)(15). Small aggregates, consisting of gold and silver nanoparticles and fractal structures of these metals that provide extremely strong field enhancement (16), can give rise to enhancement factors for HRS signals up to 20 orders of magnitude (17).…”

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confidence: 99%

Two-photon vibrational spectroscopy for biosciences based on surface-enhanced hyper-Raman scattering

Kneipp

2006

Proc. Natl. Acad. Sci. U.S.A.

132

125

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Two-photon excitation is gaining rapidly in interest and significance in spectroscopy and microscopy. Here we introduce a new approach that suggests versatile optical labels suitable for both one-and two-photon excitation and also two-photon-excited ultrasensitive, nondestructive chemical probing. The underlying spectroscopic effect is the incoherent inelastic scattering of two photons on the vibrational quantum states called hyper-Raman scattering (HRS). The rather weak effect can be strengthened greatly if HRS takes place in the local optical fields of gold and silver nanostructures. This so-called surface-enhanced HRS (SEHRS) is the two-photon analogue to surface-enhanced Raman scattering (SERS). SEHRS provides structurally sensitive vibrational information complementary to those obtained by SERS. SEHRS combines the advantages of two-photon spectroscopy with the structural information of vibrational spectroscopy and the high-sensitivity and nanometer-scale local confinement of plasmonics-based spectroscopy. We infer effective two-photon cross-sections for SEHRS on the order of 10 ؊46 to 10 ؊45 cm 4 ⅐s, similar to or higher than the best ''action'' cross-sections (product of the two-photon absorption cross-section and fluorescence quantum yield) for two-photon fluorescence, and we demonstrate HRS on biological structures such as single cells after incubation with gold nanoparticles.local optical fields ͉ plasmonics ͉ Raman spectroscopy ͉ two-photon spectroscopy ͉ biological structures T he probing of electronic or vibrational states in molecules by two photons provides several advantages over one-photon excitation, including the application of light of a longer wavelength and the limitation of the excitation volume in a sample (1, 2). These specific characteristics of two-photon excitation are of particular interest for biological applications of spectroscopy and microscopy. The development of optical probes that are suitable for two-photon excitation is therefore an important task in advancing optical techniques for biological applications. In addition, in biospectroscopy, another challenge is to obtain molecular structural information on biological samples and the development of methods to achieve this at high sensitivity, high lateral resolution in situ or in vivo, and without the need for purification.In general, by the inelastic Raman scattering process, molecular vibrations and thereby molecular structure, composition, and interactions, can be detected by the observation of scattered light with a shifted wavelength compared with the wavelength of an excitation source. The Raman shift corresponds to the energy of the molecular vibration with which an excitation photon interacts. The fingerprint-like Raman spectral information has been used to study biological samples for decades and has gained popularity in particular in combination with microscopy, where it is used for multiparameter imaging of cells and tissues based on their intrinsic molecular composition (3-5). Hyper-Raman scattering (HRS), illustrat...

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“…Although the generation of SH photons from surfaces of micron-sized particles has been reported already in the 1980s, [59] it is only since 1996 [60] that SHS experiments have been performed on colloidal systems with the aim of monitoring surface properties. It has convincingly been shown that it is possible to follow adsorption kinetics of solvated molecules at particle interfaces.…”

Section: Electrostatically Stabilized Systemsmentioning

confidence: 99%

Nonlinear Optical Spectroscopy of Soft Matter Interfaces

Roke

2009

ChemPhysChem

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Molecular interfacial properties of colloidal soft matter systems (for example vesicle fusion, or particle synthesis) can be investigated without the need of planar model systems or fluorescent labelling. Exclusively observing chemical properties and changes in a molecular layer of a few molecular dimensions thick around a small particle adds a new dimension to the field of surface science (see figure). Soft matter consists of complex molecules that can undergo drastic structural transformations under mild changes of chemical and physical conditions. Since a wide variety of chemical, physical and biological processes occur at soft matter interfaces, they can exhibit complex behavior. This is even more so for interfaces of colloidal soft matter since the relative amount of interface material increases by orders of magnitude. Herein, we focus on new developments that enable us to obtain detailed molecular structural changes in the topmost molecular layers of soft matter interfaces composed of complex bio‐molecules. In particular, the possibilities to probe interfaces of colloidal soft matter systems are discussed.

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Surface-enhanced hyper-raman scattering from SO32− adsorbed on Ag powder

Cited by 86 publications

References 23 publications

Surface‐enhanced hyper Raman scattering in silver colloidal solutions

Surface‐enhanced hyper Raman scattering in silver colloidal solutions

Two-photon vibrational spectroscopy for biosciences based on surface-enhanced hyper-Raman scattering

Nonlinear Optical Spectroscopy of Soft Matter Interfaces

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