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Two organic-inorganic hybrid solids, namely, Zn(SCN)(L-CHNO) () and Zn(SCN)(L-CHNO)(HO) (), were synthesized by incorporating chiral amino acids into the zinc thiocyanate system. Compound crystallizes as a monomeric complex in the noncentrosymmetric space group 2, while compound features a circular tetrameric structure crystallized in the noncentrosymmetric space group 222. Both compounds exhibit phase-matching second-harmonic generation (SHG) responses, which are 1.4 and 3.1 times that of KHPO, respectively. Theoretical calculations were conducted to determine the source of their SHG responses.
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http://dx.doi.org/10.1021/acs.inorgchem.5c01052 | DOI Listing |
Adv Mater
September 2025
Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, P. R. China.
The generation of coherent deep-ultraviolet (DUV) radiation via nonlinear frequency conversion remains a major scientific and technological challenge in modern optics. To date, only a very limited number of nonlinear optical (NLO) crystals-such as KBBF, ABF, and quartz-have been experimentally demonstrated to support measurable direct second-harmonic generation (SHG) at wavelengths of 177 nm or shorter. There is a pressing need to develop alternative materials or strategies that enable efficient frequency conversion in the DUV region.
View Article and Find Full Text PDFInorg Chem
September 2025
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Infrared (IR) nonlinear optical (NLO) crystals are crucial for mid-IR lasers, yet their intrinsic narrow band gaps cause low laser-induced damage thresholds (LIDTs) and detrimental two-photon absorption, thus limiting their widespread application. Herein, a synergistic strategy involving d-orbital exclusion and polarization motif construction is employed to synthesize novel chalcogenide SrZnSiS by introducing [SiS] and [ZnS] tetrahedral polarization subunits. Performance evaluation demonstrates that SrZnSiS breaks through the "4.
View Article and Find Full Text PDFACS Nano
August 2025
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
As an efficient two-dimensional nonlinear optical crystal, 3R-MoS exhibits intrinsic bulk second-order nonlinearity with substantial second harmonic generation (SHG) due to the interfacial charge transfer induced interlayer dipole and intralayer intrinsic asymmetric dipole. However, how these dipoles determine the SHG emission dipole orientation and intensity in 3R-MoS has not been clearly resolved. Here, we accurately determine the coexistence of in-plane and out-of-plane SHG emission dipoles in few-layer 3R-MoS through radial-/azimuthal-polarization excitation SHG measurements and back focal plane (BFP) imaging combined with numerical simulations, where the SHG emission dipole orientation () in real space for 3L, 4L, 5L, and 6L 3R-MoS is determined to be ∼8°, ∼16°, ∼20°, and ∼32°, respectively.
View Article and Find Full Text PDFAdv Sci (Weinh)
August 2025
Electronic Materials Research Lab, Key Lab of Education Ministry, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Achieving broadband and effective frequency conversion through non-collinear phase matching (PM) is of significant interest due to its potential applications in all-optical signal processing. To overcome the stringent requirements of the quasi-phase-matching condition, such as the period width, polarization, and incident direction, perovskite-type ferroelectric materials with natural ferroelectric domains offer advantages for achieving broadband second-harmonic generation (SHG). However, the random distribution of lattice vectors and scattering at domain walls not only causes substantial scattering losses, limiting conversion efficiency, but also complicates detection and application.
View Article and Find Full Text PDFOpt Express
June 2025
Phase matching (PM) of nonlinear optical interactions is central for obtaining efficient frequency conversion. Birefringent PM, which is highly useful in anisotropic nonlinear crystals, is limited by intrinsic bulk properties. However, application of this method can extend beyond natural constraints through form-birefringence in layered metamaterials.
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