研究目的
Investigating the laser-induced deposition of carbon nanotubes (CNTs) onto the fiber optics tips of multimode interference (MMI) devices and studying the influence of different CNTs solutions on the as-fabricated deposits.
研究成果
The study demonstrates the feasibility of a fiber sensor based on laser-induced CNTs deposition. The characteristics of the solvent in the CNTs solutions have shown to be crucial on the spatial and spectral features of the depositions. The results may lead to micro-patterned deposition of CNTs based on modal laser control, allowing deposition of CNTs with different features over the tip of the fiber.
研究不足
The study focuses on the spatial and spectral features of laser-induced CNTs deposits on MMI fiber tips but does not delve into the exact mechanisms of the laser-induced deposition in optical fibers and the effect of dispersants on the processes governing the deposition of CNTs onto optical fiber tips.
1：Experimental Design and Method Selection
The study involves the construction of an MMI device by splicing a section of no-core fiber (NCF) to a single-mode fiber (SMF). The tip of the MMI device is immersed into a liquid solution of CNTs, and laser light is launched into the MMI device to induce deposition. Different CNTs solutions using water and methanol as solvents, with and without the polymer dispersant polyvinylpyrrolidone (PVP), were tested.
2：Sample Selection and Data Sources
Single-wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) were used, purchased from Cheap Tubes Incorporated. The concentration of CNTs in the liquid solutions was kept fixed at 2.5 mg/mL for all samples. PVP concentration was 50 mg/mL.
3：List of Experimental Equipment and Materials
Fujikura splicer (FSM S70), optical spectrum analyzer (OSA), laser diode emitting at 980 nm, superluminescent diode centered at 1550 nm, wavelength division multiplexer (WDM), optical circulator, quartz cuvette, v-groove engraved steel plate, translation stage.
4：Experimental Procedures and Operational Workflow
The MMI device is immersed in a CNTs solution, and the laser diode is turned on to deliver a preset power to the tip of the MMI device for five minutes. After this period, the laser diode is turned off, and the MMI device is taken out from the CNTs solution. The tip of the MMI device is then studied by means of optical microscopy, and the reflection spectra are registered using an SLD as a broadband source.
5：Data Analysis Methods
The laser-induced deposits were studied by means of optical microscopy and the reflected spectra of a broadband source, which was registered by means of an optical spectrum analyzer (OSA).
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