Ultrafast nonresonant response of TiO2 nanostructured films

Portuondo-Campa, Erwin; Tortschanoff, A.; Mourik, Frank van; Chergui, Majed

doi:10.1063/1.2949517

Cited by 16 publications

(21 citation statements)

References 43 publications

(63 reference statements)

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“…The ultrafast optical Kerr effect, leading to self-phasing of the modulation and self-lensing of the laser beams in solids, has been studied extensively. 19,20 The n 2 value of TiO 2 mesoporous films is equal to 10 −15 cm 2 W −1 . 20 OKE could explain the red shift of Ω SPR in qualitative agreement with the experiment (Fig.…”

Section: Optical Kerr Effect (Oke)mentioning

confidence: 99%

Spectral properties of the surface plasmon resonance and electron injection from gold nanoparticles to TiO2 mesoporous film: femtosecond study

Aiboushev¹,

Гостев²,

Шелаев³

et al. 2013

Photochem Photobiol Sci

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Transient absorption spectra of gold nanoparticles (AuNPs) embedded in mesoporous TiO2 film were studied by a femtosecond laser photolysis pump-probe technique using 25 fs pulses at 740 nm (1.68 eV) and a low fluence of 24 μJ cm(-2). The shift of the bleaching peak in transient spectra by ∼100 meV is detected in the AuNP-TiO2 system, whereas the bleaching peak shift of the same AuNPs in aqueous colloids is not more than ∼5 meV. In addition to the thermal mechanism of the nonlinear response of AuNPs connecting with the electron gas heating and the smearing effect of the Fermi distribution, the electron transfer between AuNPs and TiO2 becomes important for the nonlinear response, in addition to the electron heating mechanism. The electron transfer can explain both the spectral shift and widening of the SPR band of AuNPs in TiO2.

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Section: Optical Kerr Effect (Oke)mentioning

confidence: 99%

Spectral properties of the surface plasmon resonance and electron injection from gold nanoparticles to TiO2 mesoporous film: femtosecond study

Aiboushev¹,

Гостев²,

Шелаев³

et al. 2013

Photochem Photobiol Sci

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“…2 shows the Z-scan traces generated from sample 2. The n2 for sample 1 and 2 is 1.7x10 -11 and 1.94x10 -10 cm 2 /W, which is 3 to 4 orders larger than TiO2 grown in by other methods [8]- [9]. Thermal treatment of the samples resulted in the traces becoming indiscernible (Fig.…”

Section: Experiments and Resultsmentioning

confidence: 85%

Third-Order Nonlinear Optical Properties of ALD Grown TiO2 Films by Thermally Managed Z-scan Method

Basaldua

Burkins

Kuis

et al. 2018

Frontiers in Optics / Laser Science

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Thermally managed Z-scan performed on ALD grown TiO2 films demonstrated n2 values of 1.7x10-11 and 1.94 x10-10 cm 2 /W for films grown at 100°C and 250°C, respectivelygreater than 1000X that of other growth methods. OCIS codes: (190.0190) Nonlinear optics; (320.0320) Ultrafast optics Development of next-generation high-speed photonics devices, such as ultrafast integrated modulators, require novel materials will large optical nonlinearities [1]-[2]. Established nonlinear materials cut from bulk crystals or liquids are not suitable for integration with CMOS technology. In addition to all-optical on-a-chip device applications, materials that exhibit high nonlinear absorption and a fast response time are useful in optical limiting applications [3] for the protection of optical sensors and the human eye from high intensity light such as lasers [4]. Typical materials proposed in the past for optical limiting have been semiconductors, fullerenes, carbon nanotubes, nanostructured materials such as nanoparticles, graphene, nonlinear absorbers doped in xerogels and sol gel films, glasses, filters, organic/inorganic clusters, as well as 2D atomic crystals and organic dye molecules. For most of these materials, there is a tradeoff between their optical limiting ability and damage thresholds, and response time. The vast majority of these materials are not suitable for covering large-scale areas with consistent reproducibly required for sensitive applications such as infrared counter measures sensors. Therefore, there is a need for CMOScompatible materials with sizable nonlinear optical properties. Thin-films and nanolaminates, grown using atomic layer deposition (ALD), have the potential to meet this need.

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“…[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. [11,35] One of the highlights of our instrumentation is the extension of many of the above methodologies to the UV (below 300 nm) spectral range, which is very important for biological systems as this is the region where the most abundant amino-acid residues absorb. Finally, in the last ten years or so our group pioneered optical pump/X-ray absorption spectroscopy probe techniques using picosecond and femtosecond hard X-ray pulses from a synchrotron.…”

Section: Introductionmentioning

confidence: 99%