Nonlinear materials for optical power limiting : characterization and modelling

Lundén, Hampus

doi:10.3384/diss.diva-156612

Cited by 5 publications

(2 citation statements)

References 92 publications

(350 reference statements)

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“…Additionally, the intensity‐dependent refractive index ( n = n 0 + n 2 I ) results in the self‐focusing of the beam inside the media. [ 53 ] We further investigate third order nonlinearities of TiN by exploring the self‐focusing effect, where the laser beam diameter decreases after passing through the solution. For materials with lower nonlinear absorption, the nonlinear refraction index becomes more detectable.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear Absorption in Plasmonic Titanium Nitride Nanocrystals

Sabzeghabae

Berrospe‐Rodriguez

et al. 2022

Advanced Optical Materials

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Titanium nitride nanoparticles have become a research interest due to their distinguished optical and photothermal properties. Furthermore, the search for nanoparticle solutions with tunable nonlinear optical properties for laser‐based applications is critical. More specifically, third order optical nonlinearities such as reverse saturable absorption, optical liming, and self‐focusing are important in the biomedical and electronics fields. The optical nonlinearities of titanium nitride plasmonic nanoparticles are investigated as a function of material concentration in water solutions. Furthermore, the effect of nanoparticle clustering on optical nonlinearities is investigated by fabricating micrometer‐sized clusters of ≈50 nm titanium nitride particles. These studies demonstrate that the nonlinear absorption coefficient increases linearly with concentration. However, clusters require higher concentrations compared to the freestanding nanoparticles to exhibit similar nonlinear absorption coefficient and optical density. Similarly, the optical limiting threshold for titanium nitride nanoparticles appears to be lower compared to the cluster solutions, which is impacted by the collective scattering of nanoparticles and high reverse saturable absorption. In addition, self‐focusing is observed in the continuous resonant regime. This study provides an in‐depth analysis of the nonlinear optical properties of titanium nitride, with relevant consequences for applications such as sensor protection and photothermal therapy.

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Section: Resultsmentioning

confidence: 99%

Nonlinear Absorption in Plasmonic Titanium Nitride Nanocrystals

Sabzeghabae

Berrospe‐Rodriguez

et al. 2022

Advanced Optical Materials

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show abstract

“…Transmittance spectra were recorded with a CARY 5000 UV−Vis−NIR spectrophotometer. The OPL measurement setup, which has been described earlier, 53 is based on a f/5 system. The laser beam (source an EKSPLA NT342C OPO, emitting 5 ns pulses) is expanded using a 3× Keplerian telescope.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%