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比较研究了液晶分子平行和扭曲排列对TiO2和SiO2介质膜交替的一维光子晶体透射谱的影响。向列相液晶平行取向时,光子禁带中出现四个透过峰,中心波长约1 840、1 814、1 466、1 423 nm,加热器件,峰位蓝移,相邻的两个透过峰合二为一。向列相液晶扭曲排列时,光子禁带中出现两个独立透射峰,分别位于1 865、1 489 nm,加热样品峰位蓝移。液晶分子平行排列,液晶层折射率各向异性较明显,光子禁带具有两种偏振模式透过峰。液晶分子扭曲排列,液晶层折射率各向异性不明显,光子禁带只有独立透过峰。加热样品,液晶分子排列变化,引起液晶层有效折射率值改变,透过峰位移动。
The influence of parallel and twisted alignment of liquid crystal molecules on the transmission spectra of one-dimensional photonic crystals with alternating TiO2 and SiO2 films was investigated. When the nematic liquid crystals are oriented in parallel, there are four transmission peaks in the photonic band gap. The center wavelength is about 1 840, 1 814, 1 466 and 1 423 nm. The heating device shifts the peak position blue and the adjacent two transmission Peaks into one. When the nematic liquid crystal is warped and aligned, two independent transmission peaks appear in the photonic band gap, located at 1 865 and 1 489 nm, respectively. The peak position of the heated sample shifts blue-shifted. The liquid crystal molecules are arranged in parallel, and the refractive index anisotropy of the liquid crystal layer is more obvious. The photonic band gap has two polarization modes of transmission peak. The liquid crystal molecules are twisted and arranged, the refractive index anisotropy of the liquid crystal layer is not obvious, and the photonic band gap has only an independent transmission peak. Heating the sample, the liquid crystal molecules arranged to change, causing the effective refractive index of the liquid crystal layer changes through the peak shift.