Abstract
We propose two approaches—hot-embossing and dielectric-heating nanoimprinting methods—for low-cost and rapid fabrication of periodic nanostructures. Each nanofabrication process for the imprinted plastic nanostructures is completed within several seconds without the use of release agents and epoxy. Low-cost, large-area, and highly sensitive aluminum nanostructures on A4 size plastic films are fabricated by evaporating aluminum film on hot-embossing nanostructures. The narrowest bandwidth of the Fano resonance is only 2.7 nm in the visible light region. The periodic aluminum nanostructure achieves a figure of merit of 150, and an intensity sensitivity of 29,345%/RIU (refractive index unit). The rapid fabrication is also achieved by using radio-frequency (RF) sensitive plastic films and a commercial RF welding machine. The dielectric-heating, using RF power, takes advantage of the rapid heating/cooling process and lower electric power consumption. The fabricated capped aluminum nanoslit array has a 5 nm Fano linewidth and 490.46 nm/RIU wavelength sensitivity. The biosensing capabilities of the metallic nanostructures are further verified by measuring antigen–antibody interactions using bovine serum albumin (BSA) and anti-BSA. These rapid and high-throughput fabrication methods can benefit low-cost, highly sensitive biosensors and other sensing applications.
Highlights
Surface plasmon resonance (SPR) is a label-free optical technique for real-time detection of biomolecular interactions and can be utilized for many applications, such as drug development, disease diagnostics and environmental monitoring [1,2,3,4]
Optical Properties of Metallic Nanostructures Fabricated by Rapid Nanoimprinting Method
We proposed two approaches—rapid hot-embossing and dielectric-heating nanoimprinting—for low-cost, rapid and high-throughput fabrication of nanostructures for SPR-based biosensors
Summary
Surface plasmon resonance (SPR) is a label-free optical technique for real-time detection of biomolecular interactions and can be utilized for many applications, such as drug development, disease diagnostics and environmental monitoring [1,2,3,4]. Commercial SPR methods use an optical prism for coupling incident polarized light into surface plasmon polariton (SPP) on a gold thin film. Different from the prism-coupling method, metallic nanostructures can directly excite SPP using normal incidence without any prism. The metallic nanostructures have been applied for various kinds of sensors [5,6,7,8,9,10,11,12]. They possess many benefits, including small detection volume, simple measurement setup, and ease of multiple detections.
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