Advanced Optical Materials最新文献

Controllable Method for Synaptic Nano-Device

In the Research Article (DOI: 10.1002/adom.202502484), Jianya Zhang, Yonglin Huang, Yukun Zhao, and co-workers report a controllable method to integrate single nanowire into synaptic nano-device with ultralow power consumption. It can mimic multiple functions of biological synapses for learning, corresponding to those in cover image. Due to the advantages of simplicity and cost-efficiency, this method has a promising prospect.

Composite Grating Metasurface

A composite grating metasurface, composed of alternating deep-subwavelength nanostrips of anisotropic α-MoO₃ and isotropic SiC, enables precise topological control of polaritons, whose dispersion transitions between elliptical and hyperbolic by tailoring the grating orientation or material composition. More details can be found in the Research Article by Hanchao Teng, Na Chen, Hai Hu, and co-workers (DOI: 10.1002/adom.202502073).

Optically Active Nanocrystals

With this special issue, friends and former group members wish to honor Prof. Luis Liz Marzán on the occasion of his 60th birthday. His pioneering work in metallic colloidal chemistry and bionanoplasmonics has left a lasting legacy, both scientifically and personally, through his roles as a mentor and colleague (see also the Guest Editorial, DOI: 10.1002/adom.202503590). This front cover illustrates a variety of colloidal metallic nanocrystal shapes, including chiral nanoparticles, that have been reported by Luis's group over the years. Exploring synthesis protocols for the shape control of plasmonic nanoparticles, along with investigating their optical properties and applications in biosensing and therapy, has been the major research direction of Prof. Luis Liz Marzán.

Nanoparticle Assembly

A laser focused at the substrate/liquid interface in a dispersion of plasmonic gold nanorods leads to an optically-generated thermal gradient which drags the nanorods towards the hot region, where their interactions with a dispersed polymer then result in adhesion onto the glass substrate in a circular pattern around the laser spot. More details can be found in the Research Article by Eric H. Hill and co-workers (DOI: 10.1002/adom.202500375).

The incorporation of Ruddlesden–Popper (RP)/3D perovskite heterostructures into photovoltaic cells has been shown to increase both the efficiency and stability of the devices. Here, a series of methylammonium lead triiodide (MAPbI₃) thin films treated with varying 2-phenylethylammonium (PEA) concentrations are investigated with static and ultrafast spectroscopic techniques to reveal the mechanisms of the observed performance benefits. Transient absorption spectroscopy is employed to elucidate the effect of a surface RP layer on the excited state of the MAPbI₃ films and reveal that several different RP structures are formed and participate in the charge-carrier dynamics. The passivation effects of PEA are investigated with optical pump–terahertz probe (OPTP) experiments using a variety of excitation conditions to simultaneously probe the surface and bulk recombination dynamics. Fitting models to the OPTP data for each excitation scheme allows the material parameters that govern the ultrafast dynamics to be quantified. It is found that as the PEA concentration increases, the surface recombination velocity exhibits a monotonic decrease, suggesting the RP layer is effective at passivating surface traps. Furthermore, the bulk monomolecular recombination rate is also found to decrease with the addition of PEA, indicating that the benefits of this passivation approach are not limited to the upper surface of the MAPbI₃ films.

Spectro-Polarimetric Imaging

In the Research Article (DOI: 10.1002/adom.202500864), Guoxing Zheng, Zile Li, and co-workers report a spectro-polarimetric imaging device achieving miniaturization and high integration through direct cascading diverse microcavity and metalens on a planar substrate, enabling snapshot detection of multiple light-field information dimensions from targets, indicating potential for micro-spectrometer, multi-dimensional biomicroscope, material analysis, and beyond.

Multilayered Parylene-C Films for OLED Light Extraction

The cover image illustrates multilayered parylene-C films deposited by a single-chamber chemical vapor deposition process with controlled dimer-to-monomer conversion. Alternating transparent and hazy layers create internal voids and refractive index contrast, enhancing light scattering and adhesion. When applied to OLEDs, these engineered coatings efficiently redirect trapped light, increasing external emission and improving device brightness and durability. More details can be found in the Research Article by Jae-Hyun Lee and co-workers (DOI: 10.1002/adom.202501820).

This study demonstrates a breakthrough in fabricating high-performance PdSe₂ homojunction photodetectors via an innovative mechanical exfoliation combined with in situ selenization strategy. By precisely controlling the thickness of n-type PdSe₂ (20 nm), the optimized device achieves good broadband detection (532–2200 nm) with favorable performance metrics. Polarization sensitivity with Extinction ratios of 137.5@532 and 126.5@1310 nm, surpassing existing 2D-based detectors by >27×, rapid response with 10 µs rise time and 58 µs fall time at −2 V, addressing the slow response (>10 µs) of conventional PdSe₂ devices, and outstanding responsivity of 0.895 A/W@532 and 0.112 A/W@1310 nm under −2 V, are achieved attributed to enhanced built-in electric fields and carrier separation efficiency. Kelvin probe force microscopy (KPFM) confirms a strong built-in potential (230 mV) at the homojunction interface, while thickness-dependent studies reveal that thinner n-PdSe₂ layers amplify n-type behavior and reduce carrier diffusion paths. The device further exhibits linear photocurrent-power dependence (θ≈1), high specific detectivity (1.04 × 10⁸ Jones), and robust infrared imaging capability. Furthermore, a polarization-modulated optical communication system is implemented. This work provides a scalable platform for developing high-speed, polarization-resolved photodetectors in next-generation intelligent sensing systems.

Controlling the organization of plasmonic nanoparticles with optical forces is essential for designing reconfigurable light-responsive materials. However, the role of particle shape in determining optical binding geometries remains unresolved. Here, it is demonstrated that the interplay between gold nanoparticle (Au NP) morphology and optical scattering governs distinct near-field and far-field configurations under optical trapping at a water-glass interface. Au spheres, rods, plates, and decahedra exhibit characteristic orientations and binding behaviors that directly correlate with their shape-dependent scattering responses to linearly polarized near-infrared lasers. By tuning the trapping wavelength, transitions in interparticle spacing, orientation, and collective arrangement are induced across two-, three-, and five-particle systems. These results establish NP shape as a versatile design parameter for programming optical matter, offering new opportunities for dynamic nanoscale assembly, tunable plasmonic interactions, and light-driven metamaterials.