Liquid dynamics in ZrO2 nanoporous films

Ultrafast nonresonant response of TiO2 nanostructured films

“…With ⌬⌽͑0͒ = 0.18, a wavelength = 575 nm, and a length of the interaction region in the focus of l =4 m, 11 we estimate a value of n 2 = 0.18 / 2lI =1ϫ 10 −12 cm 2 kW −1 . This is smaller by a factor of ϳ25 than values reported for pure rutile TiO 2 ͑Ref.…”

“…11͒, which allowed to spatially separate the signal from the 8-m-thick TiO 2 film from that of the glass substrate. 11 The detector was an avalanche photodiode ͑APD͒ optimized for the visible spectrum ͑Hamamatsu, APD-module C5331 series͒. An interference filter was used to suppress the pump radiation.…”

“…11 The light source was a Ti:sapphire laser, with a 250 kHz regenerative amplifier ͑Coherent RegA-9050 / Mira seed͒ delivering 50 fs pulses with 800 nm central wavelength. An optical parametric amplifier ͑Coherent, Model 9400͒ was used to produce probe pulses of 575 nm central wavelength and ϳ13 nm bandwidth.…”

“…With this setup, we managed to characterize the molecular rotational dynamics of water and other solvents confined in the pores of thin ZrO 2 films. 11 We noted that the nanoporous TiO 2 films contribute a characteristic oscillatory pattern. This article deals with a characterization of these patterns obtained from experiments with the same setup on dry films of anatase TiO 2 nanocrystals.…”

Ultrafast (Bio)physical and (Bio)chemical Dynamics

“…The physical phenomena we investigate include: solvation dynamics in polar and non-polar media [5][6][7][8][9] and at interfaces, [10,11] protein dynamics, [12][13][14][15][16][17][18][19] the excited state dynamics in coordination chemistry complexes, [6,[20][21][22][23][24][25][26] and the dynamics of charge carriers and phonons in semicon-ductor [27][28][29][30][31] and in metallic nanoparticles of different shapes and sizes. [32,33] The experimental tools we use include femtosecond pump/continuum probe transient absorption spectroscopy, [15] ultrafast fluorescence up-conversion spectroscopy, [16,17,34] photon-echo spectroscopy, [7,8] and Kerr microscopy.…”