Strong Nonlinear Response and All‐Optical Applications in Hybrid Bismuth Halide with Spatial Self‐Phase Modulation

Laser & Photonics Review, Год журнала: 2025, Номер unknown

Опубликована: Янв. 20, 2025

Abstract Perovskite materials, known for their exceptional photoelectronic and photonic properties, have attracted considerable interest in the field of nonlinear optics (NLO). Herein, 0D organic–inorganic hybrid bismuth perovskite (PPA) 3 BiI 6 (PPA = 3‐phenyl‐2‐propen‐1‐ammonium) is successfully synthesized using cooling‐induced crystallization method. The optical responses this halide are investigated within visible spectrum range 405–532 nm by spatial self‐phase modulation (SSPM) It found that exhibits excellent third‐order susceptibilities (), up to 10 −8 e.s.u. at 405 nm, which larger than those reported lead‐free perovskites previous research. all‐optical switching experiment conducted, effectively realizing phase light through interaction. Moreover, a novel unidirectional NLO excitation diode with /SnS 2 structure demonstrated spatially nonreciprocal propagation. research discovered superior properties systematically its potential applications device technology.

Язык: Английский

---

Temperature‐Responsive Photoluminescence of 1D Chiral Lead Halide Perovskites with Highly Anisotropic Second Harmonic Generation

Chinese Journal of Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 31, 2025

Comprehensive Summary Chiral perovskites provide an ideal platform for the construction of linear and nonlinear optical materials due to their diverse chemical variability, structural tunability, intrinsic non‐centrosymmetricity which have broad application prospects next‐generation optoelectronic devices. In this work, a pair 1D chiral lead halide ( R / S ‐4MeOPEA)PbCl 3 (4MeOPEA = (4‐methoxyphenyl)ethylamine) were synthesized, characterized systematically. Crystal structure analysis revealed that one‐dimensional (1D) inorganic chain formed by face‐shared chloride octahedra was separated organic spacers. The distorted endows them with broadband bluish‐white light emission centered covering range 350—700 nm width 104 nm. addition, highly anisotropic second‐harmonic generation (SHG) near unity polarization ratio observed. This work presents fresh example perovskite exotic properties, could new footstone further

Язык: Английский

---

Screw-Dislocation-Driven Growth of 2D Perovskite Spiral Microplates

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Фев. 14, 2025

Two-dimensional (2D) organic-inorganic halide perovskites are solution-processable semiconductors that promising for optoelectronic applications. Understanding crystallization mechanisms to achieve control over nanostructures is important optimizing desired properties. Here we introduce a versatile strategy synthesize spiral microplates of diverse 2D at the air-water interface through screw-dislocation-driven growth. Spirals 11 perovskite compositions (LA)2(A)n-1PbnX3n+1 with different spacer (LA) cations, A-cations, (X) anions, and n-number can be grown. They typically consist single- or few-layer step heights but exhibit stacking complexity when multiple dislocations interact. The characteristic optical properties (photoluminescence second-harmonic generation) underlying perovskites. Fluorescence-detected circular dichroism imaging shows chirality center does not translate observed chiroptical microplate, consistent length scale chiral distortion. This solution growth spirals diversifies microstructures optoelectronics other

Язык: Английский

---

Nonlinear Optical Properties of 0D Chiral Hybrid Bismuth Iodides

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Chiral hybrid metal halides show great promise for nonlinear optical (NLO) applications like circularly polarized second harmonic generation (SHG). The inherent toxicity of lead is a concern the widespread adoption frequently explored lead-based chiral halides. Here, we report and third-order NLO properties lead-free 0D compounds, (R-/S-MBA)4Bi2I10, their achiral counterpart, (Rac-MBA)4Bi2I10 (MBA: methylbenzylammonium) under excitation wavelength ranging 1360-1590 nm. (R-/S-MBA)4Bi2I10 exhibits strong SHG along with stronger third (THG). crystals showed high sensitivity to handedness pump light (gSHG - CD ≈ 9% at 1510 nm). THG response shows resonance enhancement matching excitonic absorption. Achiral maximum (χ(3) = 1.05 × 10⁻¹⁸ m2 V- 2). Z-scan measurements non-resonant femtosecond pulse 800 nm yield absorption coefficients (β) refractive index (n2) all three samples, exhibiting highest values. These halides, efficient nonlinearity, stability, are potential candidates such as Kerr-based switching, up-conversion, communication.

Язык: Английский

---

Enantiomeric Ferroelectric Chiral Domains

Journal of the American Chemical Society, Год журнала: 2025, Номер 147(19), С. 16568 - 16577

Опубликована: Апрель 29, 2025

Chiral ferroelectric crystals with inherent chirality and spontaneous polarization have recently gained considerable interest. However, the chiral topological texture, which provides a promising platform for exploring exotic functionalities, has never been found in enantiomeric crystals. Here, we report pair of molecular ferroelectrics, [RFAO][ReO4] [SFAO][ReO4] (RFAO/SFAO = (4R,5R/4S,5S)-4-fluoro-1-azabicyclo[3.2.1]octane). The enantiomers crystallize chiral-polar point group 2 at room temperature undergo two phase transitions an Aizu notation 222F2 350 K 432F2 463 K, respectively. Such enable them to show multistep switchable second-harmonic generation circular dichroism (SHG-CD) effect from high low off (inactive) SHG-CD states. More importantly, observed spiral domains enantiomers. To best our knowledge, this is first discovery Our breakthrough findings give new sights into interplay between will greatly stimulate further exploration next-generation electronic-photonic devices.

Язык: Английский

---