Azimuthal vector beam illuminating plasmonic tips circular cluster for surface-enhanced Raman spectroscopy
作者机构:Key Laboratory of Light Field Manipulation and Information AcquisitionMinistry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi'an 710129China
出 版 物:《Chinese Optics Letters》 (中国光学快报(英文版))
年 卷 期:2023年第21卷第3期
页 面:152-156页
核心收录:
学科分类:07[理学] 070302[理学-分析化学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0703[理学-化学] 0701[理学-数学] 0702[理学-物理学]
基 金:supported by the National Natural Science Foundation of China(NSFC)(Nos.11974282 and 91950207) the Doctoral Dissertation Innovation Fund of Northwestern Polytechnical University(No.CX2021039)。
主 题:surface-enhanced Raman spectroscopy plasmonic tips circular cluster array azimuthal vector beam surface plasmon polaritons
摘 要:Noble metallic nanostructures with strong electric near-field enhancement can significantly improve nanoscale light-matter interactions and are critical for high-sensitivity surface-enhanced Raman spectroscopy[SERS].Here,we use an azimuthal vector beam[AVB]to illuminate the plasmonic tips circular cluster[PTCC]array to enhance the electric near-field intensity of the PTCC array,and then use it to improve SERS sensitivity.The PTCC array was prepared based on the self-assembled and inductive coupled plasmon[ICP]etching methods.The calculation results show that,compared with the linearly polarized beam[LPB]and radial vector beam excitations,the AVB excitation can obtain stronger electric near-field enhancement due to the strong resonant responses formed in the nanogap between adjacent plasmonic tips.Subsequently,our experimental results proved that AVB excitation increased SERS sensitivity to 10-13mol/L,which is two orders of magnitude higher than that of LPB excitation.Meanwhile,the PTCC array had excellent uniformity with the Raman enhancement factor calculated to be~2.4×10^[8].This kind of vector light field enhancing Raman spectroscopy may be applied in the field of sensing technologies,such as the trace amount detection.