研究目的
Investigating the control of light transmission in a tapered optical fiber device with a liquid crystal cladding modulated by electric field and temperature.
研究成果
The study demonstrated the feasibility of modulating light transmission in tapered optical fiber devices with LC cladding using electric fields and temperature. The transmission characteristics were found to be strongly dependent on the LC director distribution and temperature. The device showed potential for application in sensing techniques, with further optimization needed to explore its full capabilities.
研究不足
The study was limited to the LC mixture E7 and a specific temperature range (20–50 °C). The device's performance at temperatures beyond the isotropic phase transition of E7 (above 60 °C) was not explored. Additionally, the influence of the taper surface on LC orientation was noted as a potential area for further optimization.
1：Experimental Design and Method Selection:
The study involved the fabrication of biconical tapered fibers using Fiber Optic Taper Element Technology (FOTET) and their integration into LC cells with different director orientations (perpendicular, parallel, twist). The LC cladding's effective refractive index was modulated by an electric field, and observations were made across different temperatures and modulation frequencies.
2：Sample Selection and Data Sources:
Standard single-mode telecommunication fiber was used for tapering. The LC mixture E7 was chosen for its sensitivity to electric field and temperature changes.
3：List of Experimental Equipment and Materials:
Equipment included FOTET for taper fabrication, a broad-spectrum light source (SuperK EXTREME), an Optical Spectrum Analyzer (Yokogawa AQ6373), a pulse generator (RIGOL DG-1032), and an amplifier (FLC A400D). Materials included the LC E7 mixture and ITO transparent electrodes.
4：Experimental Procedures and Operational Workflow:
Tapered fibers were placed in LC cells, and their transmission characteristics were measured under varying electric fields and temperatures. Dynamic response times were also measured.
5：Data Analysis Methods:
Spectral characteristics and response times were analyzed to understand the modulation of light transmission through the device.
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