Natural dye‐doped poly(methyl methacrylate) microparticles for nonlinear optics

Abstract

Poly(methyl methacrylate) (PMMA) microparticles doped with natural dyes such as paprika and chlorophyll have been prepared by the solvent evaporation technique. A mixture of paprika and chlorophyll in different ratios was also doped with microparticles. The distribution of the diameter of particles spreads in the range of 3-7 μm. UV-visible spectroscopic studies have shown that the absorption wavelength is shifted to a longer wavelength region when the paprika content increases in the dopant mixture. The nonlinear optical properties of the samples were investigated. It is found that the coloured particles have remarkable optical nonlinearities in the nanosecond regime because of the interaction of double bonds in PMMA with the delocalised π-electron system of dyes.

Hematene Nanoflakes: A Non-van der Waals Material with Superior Nonlinear Optical Properties

“…The β eff values calculated from the Z-scan curves (Table ) by numerically fitting the experimental data to eq are either comparable to or better than those reported in the literature for several novel materials, which include semiconductor core–shell nanostructures, atomic clusters of gold, noble metal nanosponges, doped carbon nanotubes, and graphene oxide. ,,− It is important to note that the linear transmission of our samples is perhaps the highest (87%) among the efficient optical limiters reported in the literature. The excellent optical limiting behavior even at such very high LT values, ease of preparation, low cost, and most importantly the very high stability of the dispersion observed for more than one year (Figure S4) offers the possibility of fabricating efficient optical limiting devices using hematene nanoflakes for the protection of human eyes and sensitive photodetectors from hazardous laser radiation.…”

Hematene Nanoflakes: A non-van der Waals material with superior nonlinear optical properties

“…It may be noted that the efficiency of ESA, which is the primary cause for the RSA observed in our sample, is dependent on the input laser energy. The βeff values calculated from the Z-scan curves (Table 1) by numerically fitting the experimental data to Eqn.4 are either comparable to or better than those reported in literature for several novel materials, which include semiconductor core-shell nanostructures, atomic clusters of gold, noble metal nanosponges, doped carbon nanotubes, and graphene oxide [45,46,[54][55][56][57][58][59]. It is important to note that the linear transmission of our samples is perhaps the highest (87%) among the efficient optical limiters reported in literature.…”

The ultra-photostable and electrically modulated Stimulated Emission in perylene-based dye doped liquid crystal

“…Organic dyes possess many interesting features that make them attractive for optical purposes. They show optically induced birefringence 1 , multiphoton phenomena 2 , they can be used as the laser dyes 3 as well as nonlinear optical features activators for the inert matrices 4 . Desired optical features can be easily achieved using many well-known processing, combining the active matter associated with valuable features and - in general - inert/passive matrix 5 .…”