利用二维光子晶体提高波的耦合效率

通过多重散射方法数值模拟研究和实验测量表明利用二维光子晶体可以提高波的耦合效率.研究发现,高的波耦合效率通常发生在光子禁带的边沿和其它非禁带区的某些频率处.当光子晶体的晶格常数接近于所传输的波的波长时,会出现很高耦合效率的共振耦合现象.利用二维光子晶体的情况下的波耦合效率最高可以达到不利用二维光子晶体时的1.89倍.这种现象在光集成器件中尤其有用.

Promoting the Coupling Efficiency of Waves by a 2D Photonic Crystal

Numerical simulations adopting the multiple-scattering method and experimental measurements demonstrate that it is practical to promote the coupling efficiency with the help of a 2D photonic crystal.It is found that higher coupling efficiency of waves generally appears at the edge of the photonic bandgaps. And resonance coupling of waves with relatively high coupling efficiency is likely to occur for the optical lattice constant of the photonic crystals approaching to the wavelength of the waves transmitted. Besides, there also exist many other frequencies that high coupling efficiency may be obtained. The maximum coupling efficiency may be as high as 1.89 times of that without introducing the 2D photonic crystal. Such an effect is especially useful for wave-coupling in optical integrated devices.