Advanced Optical Materials最新文献

TMD Optical and Polaritonic Properties Revealed

The temperature-dependent optical response of excitons in monolayer WS₂, MoS₂, WSe₂ and MoSe₂ TMDs is characterized in high-quality, hBN-encapsulated heterostructures, finding all four TMDs support surface-exciton-polaritons, with MoSe₂ demonstrating the strongest optical and polaritonic response. More details can be found in the Research Article by Itai Epstein and co-workers (DOI: 10.1002/adom.202502535).

UV Structured Light Generation via HfO₂ Metasurface

This cover showcases a low-loss hafnium oxide (HfO₂) metasurface for ultraviolet structured light generation. It supports polarization multiplexing and transforms incident Gaussian beams into outputs with tunable topological charge, radial index, and polarization order, offering a compact and versatile chip-scale solution. More details can be found in the Research Article by Cheng Zhang and co-workers (DOI: 10.1002/adom.202501940).

Zero-Order Waveplate

Waveplates have attracted increasing attention due to their irreplaceable role in polarization optics. For a long time, zero-order waveplates exhibited ultra-thin machining and application difficulties because the birefringence of the crystal was not small enough. Through non-principal axis cutting, even materials with large birefringence can achieve appropriate birefringence values by adjusting the incident direction, thereby expanding the selection range of waveplate materials and achieving precise phase control of light waves in a wide spectral range, breaking the limitations of the inherent birefringence and transmittance band of a single material. More details can be found in the Research Article by Lijuan Chen, Zeliang Gao, and co-workers (DOI: 10.1002/adom.202502910).

Diatomite Structures

The artwork highlights how bio-sourced diatomite enhances light extraction in Organic light-emitting diodes (OLEDs). By harnessing its unique porous morphology, diatomite scatters trapped photons into usable directions, enabling energy-efficient, flexible, and eco-friendly optoelectronic devices. More details can be found in the Research Article by Kyoung-Ho Kim, Seung Pil Pack, Seung Yoon Ryu, and co-workers (DOI: 10.1002/adom.202502023).

Metal-Based Thermal Emitters

The figure shows a schematic of a metal-based thermal emitter that uses counter-propagating surface waves to create bound states in the continuum (BICs) and an electromagnetically induced absorption (EIA) resonance. Together, these effects produce high-Q factors and strong directional thermal emission with stable emission spectra for varying temperature. The band structure in the upper-left panel highlights the coupling of three modes, forming a short flat band that results in highly directional emission. More details can be found in the Research Article by Justus C. Ndukaife and co-workers (DOI: 10.1002/adom.202501257).

Perovskite Patterning

This cover illustrates five emerging fabrication strategies for perovskite optoelectronics, including thermal deposition, nanoimprint patterning, inkjet printing, and laser ablation. At the center is direct photolithography, where photo-crosslinkable perovskite resins enable high-resolution, maskless patterning. Together, these methods highlight a versatile toolbox for scalable and integration-ready perovskite device manufacturing. More details can be found in the Research Article by Gun Young Jung, Yusin Pak, and co-workers (DOI: 10.1002/adom.202502624).

Nitrogen-vacancy (NV) centers in diamond are optically addressable spin defects with great potential for nanoscale quantum sensing. A key application of NV centers is the detection of external spins at the diamond surface. Among metals, platinum thin films – widely used in spintronics, catalysis, and electrochemistry – provide a particularly interesting system for such studies. However, the interaction between NV centers and metals is known to affect their quantum sensing capabilities. In this work, five platinum-covered diamond samples containing shallow NVs created via nitrogen implantation with different energies (2.5–60 keV) are used to investigate the optical and quantum properties of NV ensembles beneath metal films. A substantial reduction of the photoluminescence lifetime and a pronounced decrease of the NV⁻ population are found for NV ensembles located near the diamond-platinum interface. As a result, optically detected magnetic resonance experiments could only be efficiently performed on diamonds implanted with at least 20 keV, where a strong increase in the T₂ coherence time beneath the platinum thin films is observed. The study describes the various processes affecting NV centers near diamond-platinum interfaces and provides guidance for the integration of thin metal films with near-surface NV centers.

Reconfigurable Photonics

This work demonstrates an electrically switchable liquid crystal Fresnel lens enabling dynamic control of optical vortex phase topology. The device allows real-time detection of topological charge and vortex stability through voltage-tuned birefringence, offering a compact, low-power platform for reconfigurable singular-beam photonics and next-generation vortex-based optical communication technologies. More details can be found in the Research Article by Alina Karabchevsky and co-workers (DOI: 10.1002/adom.202502277).

Liquid Crystal Polymers

In the Research Article (DOI: 10.1002/adom.202500523), Haotian Ling, Yifei Zhang, and co-workers have designed an active EIT structure on a low-loss LCP film, featuring a novel zigzag bright mode, and graphene is first wet-transferred onto the LCP for active manipulation. The device achieves a transmittance peak of 0.71, a modulation depth of 42%, and a large group delay of 16 ps.

Reconfigurable Metasurface

An input pulse with a time-modulated envelope (top) passes through a cascaded bilayer metasurface device, which imparts a mixed-order time-derivative operation on the pulse envelope function (bottom). By exploiting the twist degrees of freedom between the two layers, the mathematical operation imparted from the device can be continuously tuned between zeroth, first, and second time-differentiation. More details can be found in the Research Article by Felix Wong and Michele Cotrufo (DOI: 10.1002/adom.202502326).