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DS: Fachverband Dünne Schichten

DS 6: Thin Film Applications II

DS 6.2: Vortrag

Montag, 16. März 2020, 11:00–11:15, CHE 91

Large area plasmonic sensor for refractive index based on partial-circular pair arrays — •Fanzhou Lv, Jiaxu Chen, Yudie Huang, Shiyao Jia, Zhihang Wang, Yi Wang, and Wenxin Wang — Harbin Engineering University, No. 145 Nantong Str, Nangang District, Harbin, China

Plasmonics is a rapidly developing branch in nanophotonics that embodies the feature of generating exceptional optical field enhancements in nanometer volumes. As a result of that, a considerable amount of high sensitivity sensors are attempting to construct based on localized surface plasmon resonance (LSPR). Here, a large area nanoarrays consist of partial-circular pairs is proposed as an example for refractive index sensing. First, the large area sample is fabricated by utilizing artificial alumina membranes with tetragonal lattice in physical vapor deposition (PVD) process and easy to implement to application. In addition, angle-resolved photonic spectroscopy is used to characterize the optical property variation of partial-circular pair (PCP) arrays as function of incident angle in the range of visible light. On one hand, for the symmetry-split nanoarray, a low-quality dipolar resonance is witnessed at normal incidence. On the other hand, after breaking the symmetry of unit in nanoarray, a strong Fano-like resonance is generated with high-quality factor. Besides, a pronounce coupling- induced reflection peak is observed within a broad spectral range, which is beneficial for improving the sensitivity of the refractive index sensor. In short, the optical phenomenon from symmetry breaking inspired us to optimize the designed PCP array as a refractive-index sensor.