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Hybrid organic–inorganic metal halides have emerged as highly promising materials for a wide range of applications in optoelectronics. Incorporating chiral organic molecules into metal halides enables the extension of their unique optical and electronic properties to chiral optics. By using chiral (R)‐ or (S)‐methylbenzylamine (R‐/S‐MBA) as the organic component, we synthesized chiral hybrid copper halides, (R‐/S‐MBA)2CuCl4, and investigated their optical activity. Thin films of this material showed a record anisotropic g‐factor as high as approximately 0.06. We discuss the origin of the giant optical activity observed in (R‐/S‐MBA)2CuCl4 by theoretical modeling based on density functional theory (DFT) and demonstrate highly efficient second harmonic generation (SHG) in these samples. Our study provides insight into the design of chiral materials by structural engineering, creating a new platform for chiral and nonlinear photonic device applications of the chiral hybrid copper halides. [ABSTRACT FROM AUTHOR]

Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect of the nonlinear optical effects for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet region, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe2) that has a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation feature, which is in contrast to other transition metal chalcogenides. Furthermore, the two-photon absorption coefficients of 1–3 layer PdSe2 (β ~ 4.16 × 105, 2.58 × 105, and 1.51 × 105 cm GW−1) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths (αs ~ 32%, 27%, and 24%) were obtained in 1–3 layer PdSe2. Such unique nonlinear optical characteristics make PdSe2 a potential candidate for technological innovations in nonlinear optoelectronic devices. Strong nonlinearities in 2D materials can lead to interesting applications in optoelectronics. Here the authors investigate the optical nonlinearity of palladium diselenide, determine the layer dependent two photon absorption efficiency and the saturable absorption modulation depth. [ABSTRACT FROM AUTHOR]

Chirality, circular dichroism, hybrid copper halides, nonlinear optics, second harmonic generation Keywords: chirality; circular dichroism; hybrid copper halides; nonlinear optics; second harmonic generation EN chirality circular dichroism hybrid copper halides nonlinear optics second harmonic generation 21094 21094 1 09/16/21 20210920 NES 210920 Because the interference is not considered, formula (4) in this Communication is not really applicable for the I d SB eff sb i estimation of the hybrid metal halide thin film. [Extracted from the article]

Keywords: chirality; circular dichroism; hybrid copper halides; nonlinear optics; second harmonic generation EN chirality circular dichroism hybrid copper halides nonlinear optics second harmonic generation 21262 21262 1 09/16/21 20210920 NES 210920 Because the interference is not considered, formula (4) in this Communication is not really applicable for the I d SB eff sb i estimation of the hybrid metal halide thin film. Chirality, circular dichroism, hybrid copper halides, nonlinear optics, second harmonic generation. [Extracted from the article]