期刊
ELECTRONICS
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/electronics10111363
关键词
all-dielectric metasurface; quasi bound states in the continuum; microcystin-LR; specific recognition; high sensitivity
资金
- National Key Research and Development Program of China [2017YFE0100200]
- National Natural Science Foundation of China [61775194, 61950410608]
- Open Foundation of the State Key Laboratory of Modern Optical Instrumentation and Zhejiang University K.P.Chao's High Technology Development Foundation
Dielectric metasurfaces offer efficient detection of microcystin-LR, with high quality factor and sensitivity; specific identification of MC-LR in mixed water with a concentration limit of 0.002 μg/L can be achieved using a specific recognition technique.
Sensing Microcystin-LR (MC-LR) is an important issue for environmental monitoring, as the MC-LR is a common toxic pollutant found in freshwater bodies. The demand for sensitive detection method of MC-LR at low concentrations can be addressed by metasurface-based sensors, which are feasible and highly efficient. Here, we demonstrate an all-dielectric metasurface for sensing MC-LR. Its working principle is based on quasi-bound states in the continuum mode (QBIC), and it manifests a high-quality factor and high sensitivity. The dielectric metasurface can detect a small change in the refractive index of the surrounding environment with a quality factor of similar to 170 and a sensitivity of similar to 788 nm/RIU. MC-LR can be specifically identified in mixed water with a concentration limit of as low as 0.002 mu g/L by a specific recognition technique for combined antigen and antibody. Furthermore, the demonstrated detection of MC-LR can be extended to the identification and monitoring of other analytes, such as viruses, and the designed dielectric metasurface can serve as a monitor platform with high sensitivity and high specific recognition capability.
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