Thermo-optical properties of colloidal solutions of CdTe nanoparticles

Rosso, Vanessa; Loicq, Jérôme; Galstian, Tigran; Renotte, Yvon; Lion, Yves

doi:10.1016/j.optmat.2005.06.002

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Thermal nonlinear refraction of materials has been intensively measured using Z-scan technique based on these thermal lens models. [7][8][9][10][11][12][13][14][15][16][17][18] It is necessary to point out that the small phase shift has been induced in the reported media and the conventional thermal lens models are suitable for these cases. However, in our previous work, 18 the reported far-field diffraction patterns of the gold nanoparticles (AuNPs) dispersed in cyclohexanone indicates that large thermal phase shift induces in the medium when using low power laser irradiation at 532 nm.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Z-scan measurement for large thermal nonlinear refraction in gold nanoparticle colloid

Sarkhosh

Mansour

2015

J. Nonlinear Optic. Phys. Mat.

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In this work, based on nonlocal heat effect and Fresnel diffraction theory, the characteristics of closed Z-scan in materials with a large nonlinear phase shift have been studied and a formula for Z-scan transmittance is derived. Numerical computations show that the shapes of Z-scan curves are greatly affected by the values of thermal nonlinear phase shift. The Z-scan behavior is compared to the conventional thermal Z-scan theories, including the thermal thin lens and aberrant thermal lens model. We have used the Z-scan models to determine the nonlinear refraction of gold nanoparticle (AuNP) dispersed in cyclohexanone under irradiation of a low power CW laser at 532 nm. The Z-scan theory based on the conventional models does not fit the experimental data well. It is found that peak-to-valley features of the AuNPs colloid Z-scan curve behave the same as the derived Z-scan theory for large thermal nonlinear phase shift. This allows us to measure nonlinear refractive index up to −1.0 × 10 −6 cm 2 /W in the tested samples. The optical limiting performance of the colloidal AuNPs is also investigated for device application. The results show that the optical limiting threshold of the AuNPs can be improved by making an appropriate choice of design geometry and increasing the AuNPs concentration of the colloids.Keywords: Z-scan theory; nonlocal heat effect; gold nanoparticles colloid; nonlinear refractive index; thermo-optic coefficient; optical limiter. 1550014-1 J. Nonlinear Optic. Phys. Mat. 2015.24. Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 08/22/15. For personal use only.

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Section: Introductionmentioning

confidence: 99%

Analysis of Z-scan measurement for large thermal nonlinear refraction in gold nanoparticle colloid

Sarkhosh

Mansour

2015

J. Nonlinear Optic. Phys. Mat.

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“…Some techniques, mainly photoacustic [19] and laser flash [20], have been used to obtain D and K in solids. More recently, the so called Thermal Lens (TL) technique has proved to be very useful in obtaining D in solids.…”

Section: Introductionmentioning

confidence: 99%

“…It is advantageous compared to the conventional techniques because it is remote, nondestructive and fast (usually in the millisecond scale). Although TL has been used in a wide range of materials such as glass, polymers and liquid crystals, it was only used to determine D in colloidal solutions doped with semiconductor nanocrystals [12][13][14][15]20]. To our knowledge this is the first time the TL technique has been used to determine the contribution of semiconductor nanocrystals and Nd 3+ ions to the thermal diffusivity of a glass matrix host.…”

Section: Introductionmentioning

confidence: 99%

Thermal diffusivity of a SNAB glass system doped with CdS nanocrystals and Nd3+

Serqueira

Dantas

Silva

et al. 2011

Chemical Physics Letters

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a b s t r a c tThis work reports on the thermal diffusivity of the SiO 2 -Na 2 CO 3 -B 2 O 3 -Al 2 O 3 (SNAB) glass system doped with semiconductor nanocrystals of CdS and Nd 3+ ions. Thermal diffusivity (D) was obtained by the Thermal Lens technique. It is shown that D decreases up to 30% when SNAB is doped with CdS nanocrystals. The effect is discussed in terms of heat transport by phonons as well as interface and surface scattering.

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