具有非对称电磁响应特性的单向类电磁诱导透明效应（EIT-like）是超材料领域重要的研究课题之一，然而目前缺少可动态切换的单向EIT-like实现手段。基于此，提出一种利用二端口的微带谐振腔与两个开口谐振环之间的耦合作用构造单向EIT-like的方法，只有特定端口能够激发出EIT-like效应，其非对称反射系数对比度达到98.7%。在此基础上，结合可调的复合左右手传输线，对微带谐振腔与开口谐振环间的耦合情况进行动态调控，从而改变单向EIT-like的激发端口，实现了激发端口可电切换的单向EIT-like，推动EIT-like在光学存储、光调制、传感等方面的应用。

针对可见光通信系统中由多径效应引起的信道衰落和接收端被遮挡造成的通信中断问题, 采用分集接收技术作为解决方案来提高通信质量。考虑到接收机复杂度和系统实现的性能代价比, 首先引入了处理相对简单但又具备分集优势的选择性合并方式, 其次通过对选择合并方式的支路数目分析, 设计了4路选通电路作为分集接收的信号处理电路, 最后完成了电路仿真和实物测试。测试结果表明: 与未加分集电路接收装置的接收系统相比, 采用分集接收技术后信噪比(SNR)提高了10 dB。

设计了一种基于超材料的微波频段宽带吸波器。吸波器采用典型的三层结构,顶层和底层为金属层,中间层为介质层。顶层是在单个单元上利用多个吸收峰叠加原理设计的由圆形开口环和方形开口环组合而成的金属结构。仿真结果表明,该吸波器在10.65~22.39 GHz频率范围内的吸收率大于90%,半峰全宽为13.07 GHz,相对半峰全宽为83.7%;吸波器整体厚度仅为中心波长的1/10。

对可见光通信系统收发端进行了研究, 采用分压限流式调制电路驱动LED, 以NJM4556AD运算放大器为核心器件作为接收端, 搭建了短距离可见光通信测试系统, 实验完成了50Hz~50kHz频率信号的有效传输, 通过优化接收端成功实现了语音信号的实时传输。实验表明, 随着频率的增加信号质量逐渐变差, 随着接收端偏离光源准直程度的增加, 接收功率逐渐变小, 甚至信号无法恢复, 并分析了影响信号恢复的主要因素, 优化电路后所传输的语音信号能够比较清晰地还原。实验结果对可见光通信的室内应用具有一定的参考价值。

Based on the photothermal detuning technique, the three linear relations among reflectance (or transmittance), temperature rise, and pump beam power are studied to achieve the absolute measurement of absorption loss. The relation between temperature and reflectance and the calculation accuracy of temperature rise on sample surface have great impacts on the measured result. The influences of parameters involved in the method and the relation between temperature and reflectance and the temperature model of sample surface are also studied. The results show that the absolute absorption loss of optical coatings can be achieved by the proposed method. The measurement accuracy depends on the temperature model and the relation between temperature and reflectance. The linear relation between reflectance and temperature rise has largest slope when probe beam wavelength is 632.8 nm and incident angle is 28o. The linear relation slope between temperature rise and pump beam power decreases with the growing of beam size and modulation frequency. The results provide theoretical and experimental supports for the perfection and further application of the photothermal detuning technique.

样品表面加热光斑和探测光斑的大小对光热技术有着重要影响，光热失调技术是一种新的可用于研究光学薄膜的微弱吸收的方法，文章理论分析了加热光斑和探测光斑尺寸对光热失调技术的影响。研究表明，加热光斑大小不变时，加热光调制频率增大，样品表面温升降低，温度分布区域减小；调制频率不变时，加热光斑越小，表面温升越大，分布区域越小。调制频率不变时，探测光斑越小，信号幅值越大，分布区域越小，信号幅值与加热光功率的线性关系的斜率越大，探测光斑的大小对信号幅频关系影响较小。研究结果对光热失调技术测量光学薄膜吸收具有重要意义。

大角度倾斜入射时，光学薄膜表现出强烈的偏振效应。这一现象在大部分应用场合会带来系统光学性能的劣变，然而控制偏振效应的光学薄膜设计是困难的。分析了产生偏振效应的内在原因，采用由三种全介质材料构成的四层膜堆和等效层结构膜堆组合得到初始膜系，结合单纯形法和共轭梯度法的多级优化，设计了1300~1330 nm和1535~1565 nm两个波段范围内分光比都为11的近红外双波段消偏振分光膜。结果显示，在45°入射时，在两个工作波段的s分量和p分量的反射率曲线偏振分离小，反射和透射引起的相位变化也控制在很小范围。

光热失调技术是利用光学薄膜反射或透射光谱的温度效应研究薄膜吸收的一种新方法,是光热技术的一种。以BK7玻璃为衬底的高反射膜为样品,以连续激光为加热光源,实验研究了该方法反射和透射探测方式,以及加热光束入射角度对光热信号的影响,得出反射和透射光热信号相位相反,加热光束入射角对光热信号的影响较小,进一步验证了光热失调技术测量光学薄膜吸收的可行性,为该方法的应用提供实验依据。

An explicit model from the matrix method is utilized to describe the measurement sensitivity of the photothermal detuning technique dependent on the polarization of the probe beam. Numerical results show that the optimal probe wavelengths and the slope of the main spectral band edges are different for both s- and p-polarized beams with the same incident angle. Compared with the random polarized probe beam at the larger incident angle, the measurement sensitivity can be improved approximately twice over with the p- and s-polarized probe beams under the optimal condition.

Antireflection coatings are very important for high-efficiency solar cells. An ideal antireflection structure should lead to zero reflection loss on solar-cell surfaces over an extended solar spectral range for all angles of incidence. Based on the optical thin-film theory, two multilayer structures are adopted as initial stacks in two conditions, respectively. With the aid of a conjugate graduate optimized method, the incident angles of antireflection coating are 0°–60°, the working wavelength range is 400–1200 nm, and two broadband and wide-angle antireflections are designed. The results show that they can all evidently reduce residual reflection.