Second-order nonlinearity of NaNbO3 nanocrystals with orthorhombic crystalline structure

Influence of Niobium Pentoxide and Sintering Temperature on Mechanical and Electrical Properties of Glass-ceramics Obtained from Recycled Automotive Windshields

“…The Nb 5+ ion induces ferroelectric behavior, which presents spontaneous polarization. The polarization promotes charge separation, created by the electronic transition from the valence band to the conduction band [55][56][57] . Alkaline sodium and potassium niobates, KNN, are a promising alternative to replace lead zirconate titanate, PZT, which has high lead content, highly harmful to the environment 58 .…”

Observation and Analysis of Incoherent Second-Harmonic Generation in Gold Nanoclusters with Six Atoms

“…The laser wavelength was chosen at 1064 nm because, as can be seen from Figures and , shorter wavelength would generate two-photon-induced PL overlapping with the HRS signal. The HRS technique has been largely applied for measurements of molecules, NPs (in solutions or suspensions), − and powders. ,, …”

“…The HRS technique has been largely applied for measurements of molecules, NPs (in solutions or suspensions), 6−11 and powders. 9,12,13 The SH light intensity generated in a composite sample with various constituents is described by 2 (ω) where I(ω) is the laser intensity and ⟨β c 2 (2ω)⟩ = ⟨β c 2 (−2ω;ω,ω)⟩ is the orientational average of the first-hyperpolarizability associated to the constituent labeled by c. The factor g depends on the scattering geometry, local field corrections, and coordinates of the molecule (or particle) with respect to the laboratory coordinates.…”

“…Consequently, metal NPs with diameters smaller than ≈50 nm may contribute in a significant way to the effective optical response of metal–dielectric nanocomposites (MDNCs). − Systems containing gold (Au) and silver (Ag) NPs are the most ordinarily explored, although composites with copper and platinum NPs have also been investigated . Indeed, measurements of the second-order nonlinearity have been performed through scattered second harmonic (SH) generation (hyper-Rayleigh scatteringHRS). ,− This kind of experiments allows measurements of the first-hyperpolarizability, β­(−2ω;ω,ω), of the NPs. Also, it has been largely reported in the third-order nonlinearity of MDNCs containing Au and Ag NPs. − The large interest in the NL behavior of MDNCs is motivated by numerous applications exploiting the LSP contributions in a variety of fields, such as spectroscopy, laser science, biophotonics, energy harvesting, and many others.…”

Studies on structural, dielectric and optical properties of (Ba0.95Ca0.05)1−x(Ti0.8Sn0.2)1−xNaxNbxO3 lead-free ceramics

“…15 It has attracted attention owing to its successive phases structure transition. 16 In addition, NaNbO 3 perovskite is an important photocatalysis semiconductor with a band gap energy of 3.4 eV. 17,18 As a result, NN is also a promising candidate in many areas of optical applications involving energy storage, optical waveguides, ultrafast optical switching, nonvolatile ferroelectric memories and semiconductor photoelectrodes.…”