Resonant nonlinear optical properties of PbS nanocrystals under nano- and picosecond pulsed laser excitation

Fick, Jochen; Schell, Jochen; Lévy, R.; Martucci, Alessandro; Guglielmi, Massimo

doi:10.1088/0963-9659/6/5/004

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…The important part played by the surface of nanoparticles on the nonlinear refractive index has been brought out by studying the nanoparticles synthesized using different surface capping agents. Nonlinear refraction studies have been done on PbSdoped films prepared by a solgel technique in the nanosecond regime and picosecond regime using DFWM and m-line techniques [22][23][24][25]. Li et al [26] have done nonlinear refraction studies of PbS nanocrystals using femtosecond z scan and reported large nonlinear phase shifts though nonlinear absorption was not observed.…”

Section: Introductionmentioning

confidence: 99%

Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix

Kurian¹,

Vijayan²,

Sandeep³

et al. 2007

Nanotechnology

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Strong nonlinear absorption is observed in nanocomposite films containing PbS nanocrystals of mean size of 3.3 nm stabilized in a commercial poly(vinyl acetate) glue by a novel and simple chemical route of synthesis. A significant blueshift of the optical absorption edge indicates strong quantum confinement. The mean nanocrystal size was characterized by x-ray diffraction and transmission electron microscopy. The surface structure of nanocrystals is analysed using infrared spectroscopy. The excitonic transitions are probed by photoacoustic spectroscopy and the results are analysed on the basis of theoretical calculations using envelope function formalism. Results of open aperture z-scan experiments suggest a model involving saturable absorption followed by two-photon absorption at a lower concentration while the data for a higher concentration fitted saturable absorption followed by three-photon absorption. Free carrier absorption due to two-photon-assisted excited state absorption appears to be the predominant mechanism of optical nonlinearity.

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Section: Introductionmentioning

confidence: 99%

Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix

Kurian¹,

Vijayan²,

Sandeep³

et al. 2007

Nanotechnology

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show abstract

“…Using the experimental data, n = 1.52 [21], c = = 3×10 8 m/s, ε 0 = 17.2 for PbS [22], λ = 632.8 nm, I p = = 1.7×10 6 W/m 2 , η = 0.05 and α = 6.65×10 6 [23], we calculate the value of χ 3 as 19.…”

Section: Dfwm Experimentsmentioning

confidence: 99%

Third order nonlinear optical response of PbS quantum dots

Chowdhury¹

2006

Semicond. phys. quantum electron. optoelectron.

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PbS quantum dots of the average size 10 nm are synthesized in the polymer matrix (PVA) following chemical route. Optical absorption spectra reveal a large blue shift from the bulk absorption cutoff wavelength. Instead of using a high power laser, we have measured for the first time the third order nonlinear susceptibility (χ 3) of PbS quantum dots using a low power continuous wave laser with the Degenerate Four Wave Mixing (DFWM) technique. The result is encouraging in nonlinear optical application at room temperature.

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Semiconductor quantum dot-doped sol–gel materials

Guglielmi

Martucci

2020

Sol-Gel Derived Optical and Photonic Materials

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Resonant nonlinear optical properties of PbS nanocrystals under nano- and picosecond pulsed laser excitation

Cited by 8 publications

References 18 publications

Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix

Two-photon-assisted excited state absorption in nanocomposite films of PbS stabilized in a synthetic glue matrix

Third order nonlinear optical response of PbS quantum dots

Semiconductor quantum dot-doped sol–gel materials

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