研究目的
Investigating the implementation of lithography-free nano-apertures on optical fibers for deep subwavelength light localization and diffraction-limited nano-spots.
研究成果
The study successfully demonstrates a lithography-free method for implementing nano-apertures on optical fibers, enabling deep subwavelength light localization. The method is scalable and suitable for large-scale production, offering potential applications in lab-on-a-fiber technology and fiber-based nano-probes.
研究不足
The technique requires precise control over film thickness to avoid closing the nano-aperture. The transmission efficiency is relatively low, and the method is currently limited to certain metals like Al and Pt due to their small skin depth.
1：Experimental Design and Method Selection:
The study involves sputtering metallic nanofilms onto the end face of nanobore optical fibers (NBFs) to create nano-apertures without lithography. The theoretical models include finite element modelling (COMSOL) for simulating light transmission properties.
2：Sample Selection and Data Sources:
NBFs with central nano-channels of diameters between 100 nm and 200 nm were used. Samples were prepared by cleaving and sputtering Al and Pt nanofilms.
3：List of Experimental Equipment and Materials:
Equipment includes a custom-built sputtering machine, He:Ne laser, supercontinuum light source, optical spectrum analyzer (OSA), and CCD camera. Materials include Al and Pt nanofilms.
4：Experimental Procedures and Operational Workflow:
Light from a He:Ne laser was coupled into the NBF, and the output was analyzed for transmission and spatial distribution. Spectral behavior was examined using a supercontinuum light source.
5：Data Analysis Methods:
The fraction of transmitted power was calculated, and spatial intensity profiles were analyzed to confirm nano-spot formation.
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