【摘要】 提出并优化了由单排渐变介质波导构成的二维空气孔型光子晶体负折射平板透镜表面的减反层,改善了成像质量.二维时域有限差分模拟计算结果表明,采用减反层后,在入射角小于23°的范围内,在使得有效折射率neff=-1的工作频率处,光子晶体表面对从空气一侧入射的平面波的反射率可降低到1%以下.更多还原

【Abstract】 We propose and optimize the antireflection coating composed of a row of tapered dielectric waveguides for two-dimensional air hole-type photonic crystal negative refraction slab lens.The image quality of the lens with the antireflection coating is improved.The simulation result using finite difference time domain method shows,at the working frequency leading to the effective index n_ eff-1,the reflection rate of the surface of photonic crystal with anti-reflection coating is reduced to below 1% in the range of incident angle less than 23 degrees.更多还原