Ju Lili, Shi Jialing, Liu Chuanyu, Huang Yingzhou, Sun Xiaonan
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 400044, China.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 400044, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jul 5;255:119698. doi: 10.1016/j.saa.2021.119698. Epub 2021 Mar 17.
Combining plasmonic and photonic elements, optoplasmonic hybrid structure exhibits excellent optical properties beyond conventional plasmonic or photonic structures. In this work, the optoplasmonic film consists of SiO2 microsphere and Au film without any nanostructures is investigated. With the help of a microsphere, the intensity of surface enhanced Raman spectroscopy (SERS) on Au film is highly enhanced (~1000 times) compared to bare Au film. The simulated electromagnetic field points out the enhancement caused by the optical lens effect of SiO2 microsphere that high light intensity is generated under the microsphere to excite surface plasmon on Au film. Furthermore, our data demonstrates the microsphere lens enhancement is greatly influenced by the size of the SiO2 microsphere and wavelength of incident light. This interesting film with a simple configuration could overcome the challenges in the fabrication and store process induced by nanostructures, which play an important role in SERS application. Our work not only enlarges the knowledge of the optoplasmonic hybrid structure, but also exhibits excellent application prospective in light harvest field e.g. enhanced spectrum, photocatalysis, optothermal effect, and hot electron generation, etc.
结合等离子体和光子元件，光等离子体混合结构展现出超越传统等离子体或光子结构的优异光学特性。在这项工作中，研究了由SiO₂微球和无任何纳米结构的金膜组成的光等离子体薄膜。借助微球，与裸金膜相比，金膜上的表面增强拉曼光谱（SERS）强度得到了高度增强（约1000倍）。模拟的电磁场指出，SiO₂微球的光学透镜效应导致了增强，即微球下方产生高光强以激发金膜上的表面等离子体。此外，我们的数据表明微球透镜增强受到SiO₂微球尺寸和入射光波长的极大影响。这种具有简单结构的有趣薄膜可以克服纳米结构在制造和存储过程中带来的挑战，这在SERS应用中起着重要作用。我们的工作不仅拓宽了对光等离子体混合结构的认识，还在光捕获领域如增强光谱、光催化、光热效应和热电子产生等方面展现出优异的应用前景。
