Li Yang, Li Xiong, Pu Mingbo, Zhao Zeyu, Ma Xiaoliang, Wang Yanqin, Luo Xiangang
State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, P. O. Box 350, Chengdu 610209, China.
Sci Rep. 2016 Jan 22;6:19885. doi: 10.1038/srep19885.
Chromatism causes great quality degradation of the imaging system, especially for diffraction imaging. The most commonly method to overcome chromatism is refractive/diffractive hybrid optical system which, however, sacrifices the light weight and integration property of diffraction elements. A method through compensation between the structure dispersion and material dispersion is proposed to overcome the chromatism in flat integrated optical components. This method is demonstrated by making use of silver nano-slits waveguides to supply structure dispersion of surface plasmon polaritons (SPP) in metal-insulator-metal (MIM) waveguide to compensate the material dispersion of metal. A broadband deflector and lens are designed to prove the achromatic property of this method. The method demonstrated here may serve as a solution of broadband light manipulation in flat integrated optical systems.
色差会导致成像系统的质量大幅下降，尤其是对于衍射成像而言。克服色差最常用的方法是折射/衍射混合光学系统，然而，这牺牲了衍射元件的轻量化和集成特性。提出了一种通过结构色散和材料色散之间的补偿来克服平面集成光学元件中色差的方法。利用银纳米狭缝波导在金属-绝缘体-金属（MIM）波导中提供表面等离激元极化激元（SPP）的结构色散来补偿金属的材料色散，证明了该方法的可行性。设计了一种宽带偏转器和透镜来证明该方法的消色差特性。这里展示的方法可作为平面集成光学系统中宽带光操控的一种解决方案。
