Research identifies improved phase matching through polarizability anisotropy in a new melilite-type chalcogenide compound, indicating potential in nonlinear optical devices.
Oxychalcogenides are extensively studied as infrared nonlinear optical (NLO) materials, as they may hybridize the advantages of oxides and chalcogenides. Here, new Eu2Ga2GeOS6 (EGGOS) was designed using Eu2Ga2GeS7 (EGGS) as the parent through anion partial substitution (APS) and synthesized by the facile flux assisted metal oxide-boron-chalcogen (FMOBQ) solid-state method. Compared with the {[Ga2GeS7]4-}∞ layer in EGGS, the {[Ga2GeOS6]4-}∞ layer in EGGOS has a greater distortion degree, thereby improving anisotropy to obtain greater birefringence and achieve phase matching, different from nonphase matching for EGGS. Through structural analysis, the first-principles and Gaussian polarizability anisotropy calculations reveal the mechanism of this transformation. This work provides ideas for designing new NLO materials with improved performances.
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Deng et al. (2025) studied this question.
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