摘要：In this letter, a guided-mode resonance （GMR） filter with the same material for both the grating layer and the waveguide layer is designed, and its optical properties are investigated. The GMR filter owns almost 100% reflection at the resonance wavelength of 800 nm with the full-width at half-maximum （FWHM） of 20 nm, and its sideband reflection from 700 to 1000 nm is less than 5%. As the resonance wavelength is influenced by more than one parameter during the fabrication process, GMR filter with the same resonance wavelength can be obtained by adjusting other parameters or even one parameter to deviate from the design value.

摘要：The reflection and transmittance of s- and p-polarized lights should be treated separately at nonzero angle incidence. By choosing two special film materials whose refractive indices meet the Brewster condition in a given incident angle, the reflection of p-polarized light can be eliminated. When the two materials are fabricated into multilayer stacks, the reflection of s-polarized light can be largely increased while the reflection of p-polarized light keeps low. According to this principle, a film polarizer with bandwidth of 198 nm or even more is designed.

摘要：Through the reversible isomerization of trans-cis-trans under the linear polarization light, the molecules of azo materials have the same tropism which is vertical to the polarization of light. This means that azo materials have photo-induced birefringence which is related to optical power and polarization angle of the light. Based on the photo-induced birefringence of azo materials, we design a new type of optically pumped semiconductor vertical external cavity surface emitting laser （OPS-VECSEL） which can control the polarization and frequency of the ejection laser. The functional molecules of azo materials are [3-azo- （4＇nitro）]- （9-ethyl）-carbazole （ANECz）.

摘要：Conventional HfO2/SiO2 and Al2O3/HfO2/SiO2 double stack high reflective （HR） coatings at 532 nm are deposited by electron beam evaporation onto BK7 substrates. The laser-induced damage threshold （LIDT） of two kinds of HR coatings is tested, showing that the laser damage resistance of the double stack HR coatings （16 J/cm2） is better than that of the conventional HR coatings （12.8 J/cm2）. Besides, the optical properties, surface conditions, and damage morphologies of each group samples are characterized. The results show that laser damage resistance of conventional HR coatings is determined by absorptive defect, while nodular defect is responsible for the LIDT of double stack HR coatings.

摘要：宽范围精准调控非晶材料的光学性能是面向光电器件等潜在应用亟需解决的关键问题之一.研究发现,通过在非晶合金CoFe-Ta-B体系中引入氧可以诱导金属-绝缘体转变,从而制备出一系列涵盖金属、半导体和绝缘体的非晶态衍生物.随着氧含量的不断增加,这些含氧非晶态衍生物的光学带隙打开,薄膜逐渐变得透明.复合高反射率的非晶合金和高透过率的非晶氧化物形成的双层薄膜结构可以实现可见光波段的全色谱可调.该研究结果为研制具有高硬度、高耐磨性、设计制备简便、全色谱可调等优异性能的大面积彩色涂层提供了一条新的途径.同时,该研究提出的设计理念可能适用于已报道的很多非晶合金体系,通过这种氧调控方式可制备出涵盖金属、半导体和绝缘体所有导电类型的非晶材料,用于研制基于这些材料光学功能特性的器件.