研究目的
To demonstrate the incorporation of chiral cellulose nanocrystal films on a photonic waveguide for the first time, in the form of integrated silica optical fibers with a helicoid nanocrystal film on their input facet, and to develop a simple, low-cost method for fabricating these fibers.
研究成果
The study successfully demonstrated the incorporation of chiral CNC films in silica optical fibers, resulting in fibers with significant circular dichroism (almost 40%) in transmission. The proposed fabrication method is simple and cost-effective, enabling the development of chiral silica optical fibers compatible with standard telecommunication fiber technology. This advancement opens up possibilities for integrating CNC films in various optical fiber types for new fiber device applications.
研究不足
The method requires a macroscopic flat surface for the self-assembly of CNCs into chiral nematic films on the fiber facets. Fibers located near the edge of the free-standing CNC film do not show chiral optical activity, indicating a limitation in the uniformity of film formation across all fibers.
1：Experimental Design and Method Selection:
The study involved the development of a fabrication method for integrating chiral cellulose nanocrystal (CNC) films on silica optical fibers. The method leverages the spontaneous self-assembly of CNCs to form chiral nematic films on the fibers' input facets.
2：Sample Selection and Data Sources:
A commercial SM450 fiber by Thorlabs was used, with a core diameter of 4 μm, cladding diameter 125 μm, and total external jacket diameter 250 μm. An aqueous CNC suspension gel (12% w/w) by Cellulose Lab was diluted to 1.5% w/w and sonicated before deposition.
3：5% w/w and sonicated before deposition.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a white light halogen source, a diode-pumped solid-state laser at 473 nm, rotating linear polarizer and quarter-wave plate, microscope objectives, a CCS200 optical spectrum analyzer by Thorlabs, and a CCD camera. Materials included the SM450 fiber, CNC suspension, and polydimethylsiloxane (PDMS) for the elastomeric dish.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved passing the silica fiber through a PDMS dish, cleaving its facets, adjusting the fiber position, depositing the CNC suspension, and allowing it to evaporate at ambient conditions. Optical characterization was performed using the described setup to measure transmittance and circular dichroism.
5：Data Analysis Methods:
Transmission spectra and circular dichroism were analyzed to evaluate the optical properties of the fabricated fibers.
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
