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为了研究光子晶体开放腔特性,采用平面波展开法和时域有限差分法对顶角为30°楔角的光子晶体和空气槽交替组成的新型光子晶体开放腔进行了研究。研究发现,这种结构的光子晶体开放腔在两个归一化频率范围(0.3006～0.35,0.6755～0.6851)内具有负折射特性,并且在负折射频率范围内可形成一个零光程的闭合回路;光子晶体与空气槽的分界面上有高的透射率,能够在某个波长产生共振。结果表明,可以利用共振波长随着折射率的变化而变化的光子晶体开放腔实现折射率的高灵敏度测量。
In order to study the characteristics of the open cavity of photonic crystals, a new type of photonic crystal open cavity composed of photonic crystals with alternating apex angle of 30 ° and air grooves was studied by the plane wave expansion method and the finite difference time domain method. It has been found that the photonic crystal open cavity of this structure has negative refraction properties in two normalized frequency ranges (0.3006 ~ 0.35 and 0.6755 ~ 0.6851) and a zero-path closed loop in the negative refraction frequency range The high transmittance of the photonic crystal at the interface with the air channel resonates at a certain wavelength. The results show that the sensitivity of refractive index can be measured by using the open cavity of photonic crystal whose resonance wavelength changes with the refractive index.