【摘要】 光子晶体是由两种或两种以上的透明材料周期排列构成的功能复合材料,它可以完全反射一定频率范围内的电磁波,这个性能称为光带隙。光子晶体将在光通信、数据存储以及光路设计等方面得到广泛的应用。本文设计了一种应变可调的二维光子晶体结构,通过基底产生的正应变改变光子晶体的周期性,从而改变其光带隙性能。利用平面波展开法考察了该结构的应变可调性,即其力致变色效应。结果表明,压应变会显著影响横向电波(Transerse electric waves,TE)的传播特性,打开多条光带隙。并且光带隙的宽度也正比于压应变的大小。利用这样的效应可以制成应变传感器或光学开关等器件。更多还原

【Abstract】 Photonic crystal is a functional composite material,which is made of two or more kinds of transparent materials periodically.It can totally reflect certain frequeny range of electromagnetic wave,such a property is called photonic band gap.photonic crystal can be widely used in areas like light communication,date restore,light circus,and so on.A two-dimensional strain tunable photonic crystal was proposed,whose periodicity was changed by the strain from the substrate,and consequently the photonic band gap property was changed.The plane wave expansion methods were used to calculate the strain tunability of the structure,which is called Mechanochromism.The results show that,the normal strain can evidently influent the propagation character of transverse electric waves through the crystal.When the compressive strain occurs,several band gaps are opened.And the width of the gaps is proportional to the quantity of compressive strain.The strain sensors or optical switches can be realized based upon the mechanism.更多还原