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Laser-Directed Asymmetric Growth of Plasmonic Chiral Ensembles
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-20 , DOI: 10.1002/lpor.202100526 Shuangshuang Wang 1 , Tao Ding 1
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-20 , DOI: 10.1002/lpor.202100526 Shuangshuang Wang 1 , Tao Ding 1
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Chiral plasmonic system due to its enhanced chiroptic activity in the visible region has attracted numerous interests in the last decade. Although various strategies have been developed for the fabrication of chiral plasmonic nanostructures, the limitations of cost-effectiveness and controllability have been the main obstacle for their practical applications. Here, continuous wave laser is used to direct the growth of chiral ensembles of gold nanoparticles (AuNPs). These AuNPs are grown from the Au-doped titanium dioxide (TiO2) films in a ring-shaped arrangement under photoreduction, which can then evolve into nanotetramers, nanotrimers, and nanodimers at different irradiation time, showing good controllability and reproducibility. Especially, the nanodimers and nanotrimers show circular differential scattering (CDS) over 20%. The optical chirality of the nanotrimers presents a prominent superchiral field, which is demonstrated for the optical sensing of chiral molecules (approximately × 10−3 m) with large spectral dissymmetric factors. Such an unprecedented growth strategy via laser direct writing is facile, tailorable, location-selective, and ligand-free, which presents significant implications for on-chip integration of chiral nano-optic devices and surface-enhanced Raman optical activity (SEROA).
中文翻译：
等离子手性集合的激光定向不对称生长
手性等离子体系统由于其在可见区域中增强的手性活动而在过去十年中引起了众多兴趣。尽管已经开发了各种策略来制造手性等离子体纳米结构，但成本效益和可控性的限制一直是其实际应用的主要障碍。在这里，连续波激光用于指导金纳米粒子 (AuNP) 手性集合的生长。这些金纳米粒子是从掺杂金的二氧化钛（TiO 2) 薄膜在光还原作用下呈环状排列，在不同的辐照时间下可演化成纳米四聚体、纳米三聚体和纳米二聚体，具有良好的可控性和重现性。特别是，纳米二聚体和纳米三聚体显示出超过 20% 的圆形微分散射 (CDS)。纳米三聚体的光学手性呈现出显着的超手性场，这被证明可用于具有大光谱不对称因子的手性分子（约 × 10 -3 m ）的光学传感。这种前所未有的激光直写增长策略简单、可定制、位置选择性和无配体，这对手性纳米光学器件的片上集成和表面增强拉曼光学活性 (SEROA) 具有重要意义。
更新日期：2022-07-20
中文翻译：
等离子手性集合的激光定向不对称生长
手性等离子体系统由于其在可见区域中增强的手性活动而在过去十年中引起了众多兴趣。尽管已经开发了各种策略来制造手性等离子体纳米结构，但成本效益和可控性的限制一直是其实际应用的主要障碍。在这里，连续波激光用于指导金纳米粒子 (AuNP) 手性集合的生长。这些金纳米粒子是从掺杂金的二氧化钛（TiO 2) 薄膜在光还原作用下呈环状排列，在不同的辐照时间下可演化成纳米四聚体、纳米三聚体和纳米二聚体，具有良好的可控性和重现性。特别是，纳米二聚体和纳米三聚体显示出超过 20% 的圆形微分散射 (CDS)。纳米三聚体的光学手性呈现出显着的超手性场，这被证明可用于具有大光谱不对称因子的手性分子（约 × 10 -3 m ）的光学传感。这种前所未有的激光直写增长策略简单、可定制、位置选择性和无配体，这对手性纳米光学器件的片上集成和表面增强拉曼光学活性 (SEROA) 具有重要意义。
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