Time-Resolved Optical Kerr Effect Measurements in Aqueous Ionic Solutions

Sánta, Imre; Foggi, Paolo; Righini, Roberto; Williams, J. H.

doi:10.1021/j100082a047

Cited by 28 publications

(24 citation statements)

References 5 publications

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“…A much weaker tail is observed for longer delays, which is governed by nuclear motions and reflects the structural relaxation processes of the liquid. For delays longer than 500 fs, the data are adequately described with a single-exponential decay time of 0.79 ps, which agrees well with previously reported values (Santa et al, 1994). A similar OKE profile is observed when the focal spot is positioned within the interior of the cell.…”

Section: Ultrafast Motions Of Intracellular Watersupporting

confidence: 90%

“…The corresponding time-resolved signal reflects the ultra-fast nuclear motions of the sample molecules. In water, the generated OKE signal is mainly dictated by the dynamics of the hydrogen-bonding network rather than by the response from single molecules (Palese et al, 1994;Santa et al, 1994;Foggi et al, 1997). Therefore, the OKE technique represents a sensitive probe for the short-time-scale dynamics of intracellular correlated water structures.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond Dynamics of Intracellular Water Probed with Nonlinear Optical Kerr Effect Microspectroscopy

Potma

Boeij

Wiersma

2001

Biophysical Journal

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A nonlinear optical Kerr effect (OKE) microscope was developed and used to elucidate the ultra-fast diffusive motions of intracellular water molecules. In the OKE microscope, a pump-induced birefringence is sensed by a delayed probe pulse within a spatially confined volume that measures 0.5 microm in the lateral direction and 4.0 microm along the axial coordinate. This microscope allows the recording of time-resolved Kerr signals, which reflect the ultra-fast structural relaxation of the liquid, exclusively from intracellular aqueous domains. Because relaxation occurs on a picosecond time scale, only local diffusive motions are probed. The microscopic OKE signal is therefore insensitive to long-time-scale hindered translational motions enforced by intracellular mechanical barriers but probes the intrinsic orientational mobility of water molecules in cells instead. The Kerr response as determined from single intact mammalian cells under physiological conditions shows a structural relaxation time of 1.35 ps, which is 1.7 times slower than the Kerr decay observed in pure water. The data indicate that the mobility of water molecules in cellular domains is moderately restricted due to the high intracellular content of proteins and solutes.

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Section: Ultrafast Motions Of Intracellular Watersupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Femtosecond Dynamics of Intracellular Water Probed with Nonlinear Optical Kerr Effect Microspectroscopy

Potma

Boeij

Wiersma

2001

Biophysical Journal

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“…2(a) and 2(b) as a result of instantaneous self-phase modulation and of soliton formation followed Ramaninduced self-frequency shift, respectively. However, the Raman shift in water is much higher (~3000 cm -1 ) than that of silica (440 cm -1 ) and the optical Kerr nonlinearity exhibits a 0.7-ps exponential decay [21], affecting the analogy with the dynamics in solid-core PCFs. For a detailed investigation of the supercontinuum dynamics a numerical simulation is under way.…”

Section: Methodsmentioning

confidence: 99%

Supercontinuum generation in a water-core photonic crystal fiber

Bozolan¹,

Matos²,

Cordeiro³

et al. 2008

Opt. Express

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Supercontinuum generation is demonstrated in a 5-cm-long water-core photonic crystal fiber pumped near water's zero-dispersion wavelength. Up to 500-nm spectral width (evaluated at -20 dB from the peak) is achieved, while spectral widths were over 4 times narrower with a bulk setup at the same wavelength and peak power, and over 3 times narrower if the PCF was pumped away from the zero-dispersion wavelength. The supercontinuum generation mechanisms for bulk and waveguide setups are compared and tuning of the zero-dispersion wavelength via waveguide dispersion is theoretically investigated.

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“…For simplicity, the Raman response was neglected, as the Raman shift in water is considerably large (-3000 cm"'). As we use a laser of 60 fs, this means that the Kerr effect cannot be modeled in nonUnear Schrodinger equation as a delta function [7]. A comparison between the spectral broadenings (at -20dB) numerically and experimentally obtained is shown in Table 1.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Theoretical and experimental study of supercontinuum generation in a water-core PCF

Bozolan¹,

Martins²,

Spadoti³

et al. 2008

AIP Conference Proceedings

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Photonic crystal fibers have been the subject of several studies for potential applications in areas such as telecommunications, sensing, metrology, biology, medicine and spectroscopy. These fibers have a number of unique features owing to their geometric structure, which consists of a matrix of regular holes that travels along its longitudinal axis. This design allows the selective insertion of materials such as gas and liquids, which interact efficiently with the guided modes. The insertion of materials can also be explored to introduce a new degree of freedom to control the properties of waveguide, by modifying modal features such as nonlinear coefficient and dispersion. Such control may, in some cases, contribute to increase the efficiency of nonlinear effects, enabling the creation of a supercontinumm spectrum. In this work we compare results obtained both experimentally and numerically of supercontinuum generation in a distilled water-core photonic crystal fiber. The results indicate the importance of setting the pump close to the zero dispersion region of the material so that a broad spectrum can be obtained. Improved agreement between experiments and simulations requires a better degree of experimental detail to be incorporated into the theoretical model, which will be the objective of future studies and work.

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Time-Resolved Optical Kerr Effect Measurements in Aqueous Ionic Solutions

Cited by 28 publications

References 5 publications

Femtosecond Dynamics of Intracellular Water Probed with Nonlinear Optical Kerr Effect Microspectroscopy

Femtosecond Dynamics of Intracellular Water Probed with Nonlinear Optical Kerr Effect Microspectroscopy

Supercontinuum generation in a water-core photonic crystal fiber

Theoretical and experimental study of supercontinuum generation in a water-core PCF

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