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将5种不同折射率的液晶分别填入实芯光子晶体光纤的空气孔中,通过改变外场条件,研究其输出光谱的变化规律,并进行了理论模拟分析.结果表明:填充液晶后,输出光谱由全通变为多个波峰的带隙式;同时,液晶的折射率差值越大,其波峰位置越向长波长方向移动,且相对光强的对比度可以达到16 d B;温度由20°C上升到85°C时,波峰向短波长方向移动,最大调控范围可达41 nm;调节电压从0—250 V,输出光谱的相对光强变小,但波峰具有较好的稳定性;在室温下,波峰不随入射光偏振态的变化而变化.该液晶光子晶体光纤可应用于温控可调谐滤波器或电控衰减器.
Five kinds of liquid crystals with different refractive indexes were respectively filled into the air holes of the solid photonic crystal fiber. The change law of the output spectrum was studied by changing the external field conditions and the theoretical simulation was carried out. The results show that after the liquid crystal is filled in, the output spectrum From all-pass to multiple bandgaps; at the same time, the larger the difference of the refractive index of the liquid crystal, the longer the peak position moves toward the longer wavelength, and the contrast of the relative light intensity can reach 16 dB; the temperature changes from 20 ° C up to 85 ° C, the peak to the short-wavelength shift, the maximum control range up to 41 nm; regulation voltage from 0-250 V, the relative intensity of the output spectrum becomes smaller, but the peak has good stability; in the At room temperature, the peak does not change with the polarization state of the incident light.The liquid crystalline photonic crystal fiber can be applied to temperature-controlled tunable filter or electronically controlled attenuator.