Nonlinear effects in light scattering of thermal lensing systems

Eden, G.E.; Schröer, Wolffram; Staude, W.

doi:10.1016/0030-4018(87)90274-4

Cited by 11 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Eqn. (17) gives an expression for the development of the ground-state concentrations of the absorbing chromophore in time and space under the perturbing influences of pump excitation, excited-state lifetime decay and its diffusion away from the excitation zone. Following the procedures of our earlier paper,' the change of intensity of the probe beam is obtained as…”

Section: T I Cm-'mentioning

confidence: 99%

See 1 more Smart Citation

Concentration-modulated absorption spectroscopy. Part 5.—Influence of molecular diffusion

Griffiths¹,

Smith²,

Jones³

1995

J. Chem. Soc., Faraday Trans.

View full text Add to dashboard Cite

Section: T I Cm-'mentioning

confidence: 99%

“…x e x ( -$) dr dz Since the probe laser is not modulated ipr(t) = i,, dt so that by introducing eqn. (17) In the event that different wavelength pump and probe lasers are employed, a2 in R is replaced by ap cpr.…”

Section: T I Cm-'mentioning

confidence: 99%

Concentration-modulated absorption spectroscopy. Part 5.—Influence of molecular diffusion

Griffiths¹,

Smith²,

Jones³

1995

J. Chem. Soc., Faraday Trans.

View full text Add to dashboard Cite

“…15 Different authors have demonstrated the scattering-free character of the PTL method. [16][17][18][19][20][21][22][23] Determination of absorption in a highly turbid sample has been reported. 24 When using a tunable pump light source, PTL spectroscopy becomes possible.…”

Section: Introductionmentioning

confidence: 99%

Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles

Olaizola

2017

Appl Spectrosc

View full text Add to dashboard Cite

This work reports on photothermal lens spectra of silver nanoparticles of different dimensions in the spectral region of 370-730 nm performed using an arc-lamp-based photothermal spectrophotometer. We show that the photothermal and extinction cross-section spectra of the samples are similar for nanoparticles of reduced dimensions where scattering effects are small. The results differ substantially for nanoparticles of a diameter larger than 30 nm for which scattering becomes relevant. We demonstrate that the photothermal spectrum corresponds to the absorption component of the particle's extinction. Photothermal spectra show a clear picture of the plasmonic peaks of the nanoparticle even in the presence of high scattering. By subtracting the photothermal component from the total extinction, we extract the scattering cross-section spectra of the nanoparticles. The technique allows determination of the absorption and scattering components of the extinction providing a better understanding of the particle's optical properties. The results agree well with the Mie approximation, which is valid for a single spherical nanoparticle. We discuss and demonstrate the application of the method to characterize particles of arbitrary shape and dimensions.

show abstract

“…1–4 Different studies have pointed out the intrinsic scattering-free character of the photothermal lens method. 5–7 Other studies have shown the usefulness of the technique for determination of absorption in highly scattering samples. 8–13 However, the majority of these studies were conducted at fixed wavelength values.…”

Section: Introductionmentioning

confidence: 99%

White Light Photothermal Lens Spectrophotometer for the Determination of Absorption in Scattering Samples

et al. 2014

View full text Add to dashboard Cite

We developed a pump-probe photothermal lens spectrophotometer that uses a broadband arc-lamp and a set of interference filters to provide tunable, nearly monochromatic radiation between 370 and 730 nm as the pump light source. This light is focused onto an absorbing sample, generating a photothermal lens of millimeter dimensions. A highly collimated monochromatic probe light from a low-power He-Ne laser interrogates the generated lens, yielding a photothermal signal proportional to the absorption of light. We measure the absorption spectra of scattering dye solutions using the device. We show that the spectra are not affected by the presence of scattering, confirming that the method only measures the absorption of light that results in generation of heat. By comparing the photothermal spectra with the usual absorption spectra determined using commercial transmission spectrophotometers, we estimate the quantum yield of scattering of the sample. We discuss applications of the device for spectroscopic characterization of samples such as blood and gold nanoparticles that exhibit a complex behavior upon interaction with light.

show abstract

Nonlinear effects in light scattering of thermal lensing systems

Cited by 11 publications

References 13 publications

Concentration-modulated absorption spectroscopy. Part 5.—Influence of molecular diffusion

Concentration-modulated absorption spectroscopy. Part 5.—Influence of molecular diffusion

Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles

White Light Photothermal Lens Spectrophotometer for the Determination of Absorption in Scattering Samples

Contact Info

Product

Resources

About