光子晶体异质结的位相和应用

Phase properties of photonic crystal heterostructure and its applications

研究了由不同周期结构的光子晶体组成的异质结和含耦合杂质的光子晶体异质结的位相.发现光子晶体异质结使光子晶体杂质模的反射率接近1,但反射相移不随反射率的改变而改变,反射相移只由前边的子光子晶体的禁带、通带或耦合杂质模中的子峰决定.即异质结的前边的子光子晶体的耦合杂质模中的每一子峰、每一通带或禁带对应的反射相移为2π.对多杂质耦合的结构,反射相移很灵敏,可用于制作高灵敏光子器件.以全光位相与非门为例描述全光位相逻辑门的方案和可行性.另外,这些特性对研究位相有关的新物理过程和现象有意义.

It is revealed that the reflectance in the whole stop band of a heterostructure, including the defect mode, approaches 1; while the phase-shift depends on the sub-photonic crystal （PC） that faces the incident direction. For every sub-peak in the defect mode or every pass band of the sub-PC facing the incident direction, the phase shift is 27. These properties are useful for designing optical phase devices several orders more sensitive than those using amplitude-signal. In this paper, a sensitive optical phase logic gate （NAND） is described as an example of optical phase devices. Moreover, these properties are also useful for the study of related physical phenomena.