We designed and fabricated an array of metallic nano-aperture on a gold film to enhance the detection of immunoglobulin G (IgG) protein in the liquid environment. The plasmonic nanostructure is designed to exhibit a resonance at 762 nm. The field enhancement improved the sensitivity of the system, enabling the detection of IgG protein at low concentrations, i.e. 4 ng/ml. Raman spectroscopy was employed to record the protein’s spectral signatures at multiple locations across the plasmonic nanostructure under laser excitation at 530 nm, revealing an enhancement in the Raman signal. This work paves the way for developing plasmonic nanostructures suitable for large-scale applications, with particular potential in diagnostics and environmental studies.
In this work, we have identified the size of microplastics collected from Shi Lake, China, using an optical tweezer micro-Raman spectroscopy (OTMRS) system. The microplastics were classified based on their size as products of degradation of large plastic material. Most of them were in the sub-20 μm regime. On the other hand, as nanoplastics may be more extensively distributed and hazardous than larger-sized plastics, their detection is a key point. Thus, we have designed a planar metamaterial structure and have studied the near-field enhancement in order to detect and analyze nanoplastics in aquatic environments with high sensitivity and selectivity. This study paves a way to improve our knowledge of small plastics abundance and pollution in freshwater around Shi Lake.
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