研究目的
To achieve enhanced absorption from plasmons on a fiber-optic probe and thus move closer to applications of surface-enhanced infrared absorption spectroscopy (SEIRAS).
研究成果
The tapered fibers coated with a 100 nm Au film on one side produced enhanced signal absorption for the two investigated dyes. The results confirm that the concept of SEIRAS can be implemented on an optical fiber probe, enabling enhanced signal detection in remote sensing applications.
研究不足
The enhancement was lower than other demonstrations in the infrared range, possibly due to plasmon interaction on only part of the circumference of the taper. The design could be improved by simulating the mode fields of the optical fiber and the shape of the metal nanostructures on the fiber surface.
1：Experimental Design and Method Selection:
The study utilized a tapered coreless fiber coated with a 100 nm Au film to support signal enhancement at visible wavelengths. The method was inspired by previous work on SPR sensing on fibers and aimed to implement surface-enhanced absorption spectroscopy on a fiber probe.
2：Sample Selection and Data Sources:
Two dyes, Rhodamine 6G and Crystal Violet, were used to demonstrate the enhancement effect. These dyes were chosen for their high absorption cross-section in the visible spectrum.
3：List of Experimental Equipment and Materials:
A broadband halogen lamp, OceanOptics USB2000 grating spectrometer, Fujikura FSM-100P fusion splicer, and AJA Sputter and Evaporator were used. Materials included coreless termination fibers, MM fibers, and Au for film deposition.
4：Experimental Procedures and Operational Workflow:
The tapered fibers were coated with Au and spliced to pigtailed MM fiber patch cables. The setup was illuminated with a halogen lamp, and the change in absorption was measured with a spectrometer.
5：Data Analysis Methods:
The absorbance was determined experimentally from the transmitted intensity. Measurements were averaged with an eight-point moving mean and a Savitzky–Golay filter.
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