研究目的
Investigating the optical and magneto-plasmonic properties of Ag/Co and Ag/Co/Ag multilayer nano-hole arrays and their application in sensing.
研究成果
The study demonstrated that the optical and magneto-optical properties of nano-hole arrays can be significantly enhanced by adding Ag plasmonic layers. The sharp Faraday rotation peaks, with narrow line widths, offer improved sensing performance compared to conventional plasmonic nano-hole array-based sensors. This strategy is useful for future design and application of plasmonic materials.
研究不足
The main limitation is the detection range of sensors (n = 1 to ~1.52), where the refractive indices of surrounding medium and glass substrate are too close, making the FR peaks indistinguishable. This can be overcome by using substrates with higher refractive index.
1：Experimental Design and Method Selection:
The study involved the fabrication of Ag/Co and Ag/Co/Ag multilayer nano-hole arrays using shadowing nanosphere lithography (SNL) technique and electron beam deposition. The optical and magneto-optical properties were investigated through experimental measurements and finite-difference time domain (FDTD) calculations.
2：Sample Selection and Data Sources:
Hexagonally closely-packed polystyrene (PS) nanosphere monolayers were assembled on glass substrates as a deposition template. The samples were characterized using atomic force microscopy (AFM), optical transmission spectra, and Faraday rotation (FR) spectra.
3：List of Experimental Equipment and Materials:
Polystyrene nanospheres (Polyscience, Lot# 679675, diameter D = 500 nm), silver (Ag), cobalt (Co), and titanium (Ti) for e-beam depositions, AFM (Park Systems NX-10), and a home-built FR spectroscopy based on a photoelastic modulation (PEM).
4：Experimental Procedures and Operational Workflow:
The fabrication process included reducing nanosphere diameter via reactive-ion etching (RIE), depositing metal layers, and removing the PS nanosphere monolayer. Optical and magneto-optical characterizations were performed under an applied magnetic field of 1.8 Tesla.
5：8 Tesla.
Data Analysis Methods:
5. Data Analysis Methods: The optical and magneto-optical responses were analyzed using FDTD calculations to understand the experimental results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
