Nonlinear Optical Refraction and Absorption of Media

Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles

“…The obtained values of nonlinear-optical parameters shown in Table 1 overlap with the data available in the literature for plasmonic nanoparticles dispersed in different matrices ( esu) [ 25 , 48 , 49 ] and references therein. Because the measured values of nonlinear-optical parameters reported in the literature can vary depending on the intensity of the laser beam, the pulse-width, nanodopant concentration, and the type of matrix, an exact comparison is not a trivial task.…”

Hybrid Germanium Bromide Perovskites with Tunable Second Harmonic Generation

“…Second harmonic generation (SHG) as one of the most fundamental NLO processes, exhibits strict symmetry dependence for nonlinear polarization of materials, requiring non-centrosymmetric structures. [27,28] An im-portant task in the field of NLO applications is to explore the correlation between the structure of hybrid metal halide perovskites and their NLO properties, which would facilitate further optimization for NLO applications, including alloptical modulation, [29,30] multiphoton microscopy, [31,32] highresolution optical lithography, [33] optical limiting [34][35][36][37] and THz generation/detection. [38,39] Common metal halide perovskites usually crystallize in centrosymmetric space groups, especially the three-dimensional parent perovskites structures.…”

“…The abundant structural diversity and favorable physical properties [24–26] prompt hybrid metal halide perovskites as attractive candidates in the field of nonlinear optical (NLO) applications. Second harmonic generation (SHG) as one of the most fundamental NLO processes, exhibits strict symmetry dependence for nonlinear polarization of materials, requiring non‐centrosymmetric structures [27, 28] . An important task in the field of NLO applications is to explore the correlation between the structure of hybrid metal halide perovskites and their NLO properties, which would facilitate further optimization for NLO applications, including all‐optical modulation, [29, 30] multiphoton microscopy, [31, 32] high‐resolution optical lithography, [33] optical limiting [34–37] and THz generation/detection [38, 39] .…”

From C4H7N2Ge0.4Sn0.6Br3 to C6H11N2Ge0.4Sn0.6Br3: Effective Modulation of the Second Harmonic Generation Effect and Optical Band Gap by Planar π-Conjugated Organic Cation Size

“…The crystal generates a second harmonic response very much dependent on the nonlinear polarization of the material, a prerequisite for having a nonlinear effect must be to crystallize in a noncentrosymmetric (NCS) space group. 28,29 Ordinary metal halides are usually crystallized in the centrosymmetric space group, and the SHG effect of these structures is inert; therefore, the design of materials capable of breaking the symmetry centers in order to obtain a strong SHG effect remains a challenge.…”

“…Organic–inorganic hybrid materials adequately combine the properties of organic and inorganic materials and exhibit excellent second harmonic generation (SHG) effects, thus making them promising candidates in the field of nonlinear optics. The crystal generates a second harmonic response very much dependent on the nonlinear polarization of the material, a prerequisite for having a nonlinear effect must be to crystallize in a noncentrosymmetric (NCS) space group. , Ordinary metal halides are usually crystallized in the centrosymmetric space group, and the SHG effect of these structures is inert; therefore, the design of materials capable of breaking the symmetry centers in order to obtain a strong SHG effect remains a challenge.…”