光在强色散合金膜及颗粒膜界面反常折射过程中相位突变研究

This project will focus on the study of the phase discontinuity, positive/negative refraction effects occured at the surface of metal-based films with strong dispersion during refraction of light. The electron beam deposition system and ion beam sputtering system will be used to prepare the samples of alloy films and granular films. The alloy films/ granular films consist of noble metal with negative index of refraction in certain wavelength band and the metal/nonmetal material of positive index of refraction. The dependence of the effective index of refraction, refractive angle on the incident angle, wavelength of light, as well as the size of metal granule, component of alloys etc. will be measured and analyzed. It is expected to find null effective index of refraction for some alloy films and granule films in certain wavlength band, which may show anomalous refraction and reflection properties of the films. The better understanding of the interacting mechanism of light with these films with strong dispersion will provide scientific references for their various applications, especialy in the field of information science and technology.

本项目拟对光在金属合金薄膜或金属颗粒膜边界传播时发生的表面相位突变效应、正/负折射效应等特性进行研究。利用电子束蒸发设备、离子束溅射系统等制备高质量的合金膜（或颗粒膜）样品，合金膜（或颗粒膜）由在特定波长内具有负表观折射率的金属和正折射率的金属（或非金属）组成，并对有效折射率、折射角等物理量随入射角、波长、金属颗粒尺度、合金膜组分等参数变化规律进行实验测量，尝试寻找到折射率为零或无限接近于零的奇异点组分，预期可以发现奇异的折射和反射特性，对其机理进行分析研究，增进人们对光在金属颗粒膜及合金膜边界复杂传播特性的认识，并为其在信息光学等领域的应用提供科学依据。

本项目利用电子束蒸发设备、离子束溅射系统等制备高质量的合金膜（或颗粒膜）样品。对光在金属合金薄膜或金属颗粒膜边界传播时发生的正/负折射及零折射效应、表面相位突变等特性进行研究。结果表明纯金膜在520nm处表现奇异的零折射特性；银铟AgxIn1-x合金膜的零折射特性与波长与组分均相关，对420nm波长的光， 组分约为x=0.7的合金膜表现出零折射特性。这些奇异折射特性依赖金属表面与光的相互作用，导致对光波波前的非均匀相位调制，其详细机理有待进一步分析研究。在项目实施期间，项目组成员共在国际核心(SCI)学术刊物上发表研究论文25篇；发表专著《凝聚态光学研究前沿》第3章；发表会议论文15篇，其中国际会议论文7篇，国内会议论文8篇；申请发明专利 3项，获授权发明专利1项。该研究取得的结果增进人们对光在金属颗粒膜及合金膜边界复杂传播特性的认识，并为其在信息光学等领域的应用提供科学依据。