近红外光区一维光子晶体高反射镜的设计

研究设计了适用于近红外光区(1 000～2 000nm)且具有异质结构的一维光子晶体宽禁带高反射镜.选取TiO2和SiO2两种常见材料构造一维光子晶体的异质结构,采用传输矩阵的方法计算光子晶体的反射率;并通过数值模拟分析横磁波(TM)和横电波(TE)从空气介质中入射时光子晶体的反射谱.结果表明:设计的具有异质结构的一维光子晶体对TM波在0°～20°和TE波在0°～25°均有较高的反射率(大于0.999 98).设计的宽禁带高反射镜是为了适应可调红外气体激光器和半导体红外可调器谐振腔激光技术发展的需要,也可代替带宽窄、反射率低的传统反射镜应用于各种近红外光谱仪.

Design on a one-dimensional photonic crystal high reflector in near-infrared region

The author investigates the design of high reflector based on one-dimensional photonic crystal of heterostructure in near-infrared spectrum(1 000～2 000 nm).Two kinds of common materials(TiO2 and SiO2) are selected to construct the one-dimensional photonic crystal of heterostructure and transfer matrix method is adopted to calculate the reflectance.The reflection spectra of the incident transverse magnetic(TM) wave and transverse electric(TE) wave are analyzed by numerical simulation.The result shows that one-dimensional photonic crystal of heterostructure possesses a high reflectance in near-infrared spectrum(more than 0.999 98) when the incident angles of TM and TE wave are 0°～20° and 0°～25°,respectively.The high reflector with a wide band-gap is designed to adapt to the need of adjustable infrared gas lasers and semiconductor infrared adjustable device resonator,and it can be used in all kinds of near infrared spectrograph to replace the traditional reflectors.