title: Circular Fibonacci gratings.
abstract: We introduce circular Fibonacci gratings (CFGs) that combine the concept of circular gratings and Fibonacci structures. Theoretical analysis shows that the diffraction pattern of CFGs is composed of fractal distributions of impulse rings. Numerical simulations are performed with two-dimensional fast Fourier transform to reveal the fractal behavior of the diffraction rings. Experimental results are also presented and agree well with the numerical results. The fractal nature of the diffraction field should be of great theoretical interest, and shows potential to be further developed into practical applications, such as in laser measurement with wideband illumination.
authors.affiliation: Key Laboratory of Microelectronics Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Gao
authors.forename: Yuchao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Changqing
authors.initials: C
authors.lastname: Xie