制备了乙醇 二氧化硅三维胶质光子晶体 ,其晶格常数随着晶体高度的变化而变化 .用皮秒脉冲激光在不同高度激发光子晶体中乙醇产生Raman信号 ,得到了两个结果 :1 )即使Raman信号的中心频率与光子晶体的带隙中心频率一致 ,在其禁带方向上测得的强度也没有被抑制到与带隙深度同样的量级 ;2 )尽管单纯的具有Raman信号频率的入射光的透过率随着高度的变化而剧烈变化 ,但在光子晶体中产生的Raman信号强度却几乎不随高度的变化而变化 ,即光子晶体的赝带隙几乎没有影响在禁带方向上测得的Raman信号强度 .基于“光子晶体带隙对入射光和内部光源传播影响不同”的物理机理 ,比较合理地解释了这两个实验结果 ,即探测到的较大Raman信号强度来源于光子晶体内部缺陷对内部Raman信号的散射和光子晶体外表面直接产生的Raman信号 The lattice constants of the three dimensional colloidal photonic crystals of ethanol silica were changed with the changes of the crystal height.The Raman signals of ethanol were generated by picosecond pulsed laser at different heights, Even if the center frequency of the Raman signal is consistent with the center frequency of the band gap of the photonic crystal, the intensity measured in the forbidden band direction is not suppressed to the same order of magnitude as the band gap depth. 2) Although the Raman signal has a purely Raman signal frequency The transmittance of incident light changes drastically with height, but the intensity of Raman signal produced in photonic crystal hardly changes with the height. That is, the photonic crystal has almost no influence on the band gap in the band gap The Raman signal intensity obtained is based on the physical mechanism that “photonic bandgap has a different effect on the propagation of incident light and internal light source.” These two experimental results are reasonably explained, that is, the intensity of the detected Raman signal is derived from the photonic crystal Internal defects on the internal Raman signal scattering and photonic crystal surface Raman signal directly generated