Advanced Optical Materials最新文献

Transition Metal Carbo-Chalcogenide

The cover of article 2402385, Zhongben Pan, Yuqiang Fang, Dechun Li, and co-workers showcases Nb₂CSe₂, a novel 2D transition metal carbo-chalcogenide (TMCC) combining TMD and MXene properties. With outstanding near-infrared absorption, ultrafast carrier dynamics, and robust nonlinear optical responses, Nb₂CSe₂ demonstrates its potential as a saturable absorber. Integrated into an erbium-doped fiber laser, it enables sub-picosecond mode-locked pulses and dual-wavelength soliton dynamics, paving the way for TMCC applications in ultrafast photonics.

Dinuclear Pt(II) Complexes

The novel butterfly-like dinuclear Pt(II) complexes, Di-Pt-CH₃ and Di-Pt-CD₃ with non-fluorinated NHC ligands are developed. They exhibit blue emission and a short emission lifetime. The EQE_max of 18.3% and 25.4% are obtained from PhOLED and PS-TADF OLED, respectively with higher efficiency and lifetime than those of Ir complex. The deuterium-substituted methyl group (-CD₃), a significantly improved device lifetime. More details can be found in article 2402230 by Soo-Byung Ko, Taekyung Kim, Yun-Hi Kim, and co-workers.

Chiral Plasmonic Nanoparticles

Strong helical dichroism has been achieved in a chiral plasmonic nanoparticle (helicoid) array (2D helicoid crystal). More details can be found in article 2402268 by Ki Tae Nam, Sejeong Kim, and co-workers.

Liquid Crystal Waveguiding

A layer of nematic liquid crystal forms a complex three-dimensional structure on top of a substrate with patterned alignment, to minimize the total free energy. Roughly in the middle of the layer, there is a region where the director is perpendicular to the substrates, forming a multimode waveguide for TE polarized light. The figure illustrates how a green laser beam follows the curved waveguide formed by the patterned liquid crystal. More details can be found in article 2402174 by Kristiaan Neyts and co-workers.

Luminescence

This cover image illustrates an inorganic material as a support for luminescent species in the red, green, and blue regions. The layered double hydroxydes LDH-HMA:Ln containing the lanthanide ions (Ln: Eu³⁺, Gd³⁺, and Tb³⁺) and mellitate (HMA⁵⁻) are promising for white-emitting materials. For further details, see article number 2402187 by Ercules E. S. Teotonio, Huayna Terraschke, and co-workers.

Optimal Multipole Center

This crucial advancement in nanophotonics, optomechanics, and other theoretical and computational physics applications solves the fundamental problem of identifying the optimal multipolar expansion origins for fields scattered by small particles. The findings also show that electric and magnetic multipolar centers, which are positioned separately from each other and particles' centers of mass, move depending on the incident frequency and angle. More details can be found in article 2402787 by Alexander V. Kildishev, Karim Achouri, and Daria Smirnova.

The development of scalable techniques for large-area growth of layered materials unlocks technological opportunities for the implementation of devices and components suitable for on-chip integration on photonic integrated platforms. Here, terahertz (THz) photoreceivers based on large-area hexagonal boron nitride/single-layer graphene (SLG)/hexagonal boron nitride heterostructures, prepared by chemical vapor deposition and realized by means of an industrially scalable method, are reported. The photo-thermoelectric sensors are integrated on-chip with planar antennas, on-chip radio frequency circuitry, a low-pass hammer-head filter and coplanar strip lines, combining nanosecond response time and large sensitivity. Room temperature responsivities of ≈4 V W⁻¹, with noise equivalent power ≈4 nWHz^−1/2 at high (2.86 THz) frequencies are reached, in a fully frequency-scalable architecture. This paves the way for multiplexed hyperspectral THz cameras and optical communication systems.

Wavefront Shaping

In article 2401985, Kishan Dholakia and co-workers describe high-fidelity projection of structured light through a multimode fiber. The projection of Bessel beams, Airy beams and Laguerre-Gaussian is demonstrated, enabling advanced microscopy technologies at the tip of a hair-thin optical fiber.

N-Heterocyclic Carbene Metallacycles

In article 2401793, Dongjin Qian, Tao Tu, and co-workers achieve tunable full-color fluorescence, featuring white light, based on constrained binuclear N-heterocyclic metallacycles and sulforhodamine B. The co-existence of covalent and coordination bonds within the metallacycles significantly enhance quantum yields and enabling them as versatile, multicolored functional materials.

Pressure-Induced Unusual Transition of Luminescence Mechanics

In article number 2402086, Lingrui Wang, Junnian Chen, Lei Zhang, Haizhong Guo, and co-workers report that (C₆H₁₀N₂)PbBr₄ and (C₆H₁₀N₂)PbCl₄ exhibit excitation-dependent emission enhancement under excitation at 303 nm and 355 nm, highlighting a piezochromic luminescence property. This phenomenon is attributed to lattice compression, which reduces the electron-phonon coupling strength. This work not only offers effective methods to modulate the optical properties of hybrid perovskites but also opens avenues for further exploration of their novel photophysical properties.