Controllable random lasers from dye-doped liquid crystal with plasmonic silver nanostructures

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-04-09 DOI:10.1016/j.optmat.2025.117038

Lihua Ye , Qingfen Ma , Ziang Zhang , Yanqing Lu , Bing Gu

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Abstract

In this paper, the random lasers from Dye-Doped Nematic Liquid Crystals (DDNLC) with silver nanostructures of different shapes are investigated. The single-step polyol-solvothermal synthesis strategy is used to obtain the different silver nanostructures by controlling the reaction pressure with the help of silver amount and halide ions. These silver nanostructures are respectively named silver nanowires (Ag NWs), irregularly shaped silver nanoparticles (Ag NPs), silver nanospheres (Ag NSs) and silver nanocubes (Ag NCs). The investigations reveal that all silver nanostructures have intensive enhanced spectral effect due to localized surface plasmon resonance (LSPR), while the best random lasing properties are noticed in Ag NCs doped in DDNLC. This is because Ag NCs exhibit broad absorption spectrum that sufficiently overlaps with both absorption and emission of dye PM597. In addition, the sharp features of Ag NCs tend to increase charge separation and provide stronger local electric field. When the size increases from 36 nm to 144 nm, Ag NCs with a size of 99 nm achieve the lowest threshold (1.7 mJ/cm²) and the highest intensity of random laser emission because of a balance between enhanced local electric field and scattering. The random lasing in silver nanostructures doped in DDNLC is predicted to be applied in sensing and integrated photonic devices.

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等离子体银纳米结构染料掺杂液晶的可控随机激光器

本文研究了具有不同形状银纳米结构的掺染向列液晶（DDNLC）产生的随机激光。本文采用单步多元醇-溶剂热合成策略，通过控制反应压力和银量及卤化离子，获得了不同形状的银纳米结构。这些银纳米结构分别被命名为银纳米线（Ag NWs）、不规则银纳米颗粒（Ag NPs）、银纳米球（Ag NSs）和银纳米立方体（Ag NCs）。研究发现，由于局部表面等离子体共振（LSPR），所有银纳米结构都具有密集增强的光谱效应，而掺杂在 DDNLC 中的银纳米立方体则具有最佳的随机激光特性。这是因为 Ag NCs 具有宽广的吸收光谱，与染料 PM597 的吸收和发射光谱充分重叠。此外，Ag NCs 的尖锐特征往往会增加电荷分离，并提供更强的局部电场。当尺寸从 36 nm 增加到 144 nm 时，由于增强的局部电场和散射之间的平衡，尺寸为 99 nm 的银纳米氧化物 NC 达到了最低的阈值（1.7 mJ/cm2）和最高的随机激光发射强度。掺杂了 DDNLC 的银纳米结构中的随机激光有望应用于传感和集成光子设备。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.