Dual-periodical photonic crystal heterostructures can form several defect modes in the transmission spectrum without doping. It is shown that the transmission rates are proportional to the axial stresses acted on photonic crystal in practical applications. Based on the theoretical research, a single-cantilever accelerometer was designed which has the characteristics of multi-range, ultra-sensitive, wideband. At the root of the accelerometer, the original pressure sensitive resistor was replaced by a heterogeneous two-cycle structure of photonic crystal Detecting the change rate between the transmitted light and the original light intensity, the magnitude of the acceleration can be got. It is shown that the accelerometer can detect 0. 01gn when the transmission intensity changes one out of ten thousand and its measuring range is up to 100gn by the ANSYS software simulation, and the accelerometer works normally from the modal analysis figures, which will be used widely in the field of self-control, vehicle and testing, etc.%对于异质双周期结构的光子晶体而言,不需要掺杂即可形成多条透射谱.理论结果显示,在实际应用范围内,透射率与光子晶体所受的轴向应力呈简单的线性关系.据此,设计了一种单悬臂梁结构的多量程、超灵敏的宽频带加速度计.在单悬臂梁根部所受应力最大处,用异质双周期光子晶体替代以往的压敏电阻,只需检测出透射光强与入射光强的比值,即可测出加速度.ANSYS软件仿真结果表明,当透射光强改变万分之一时,该加速度计可以感知0.01gn的加速度变化,测量量程可达l00gn.从模态分析图中可以看到该加速度计可以稳定地工作,可用在自控、车辆、测试等领域.
展开▼
