Hoang Thu Trang, Ngo Quang Minh, Vu Dinh Lam, Nguyen Hieu P T
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
Sci Rep. 2018 Nov 6;8(1):16404. doi: 10.1038/s41598-018-34787-9.
The spectral properties of Fano resonance generated in multilayer dielectric gratings (MDGs) are reported and numerically investigated in this paper. We examine the MDG consisting of numerous identically alternative chalcogenide glass (AsS) and silica (SiO) multilayers with several grating widths inscribed through the structure, emphasizing quality (Q) and asymmetric (q) factors. Manipulation of Fano lineshape and its linear characteristics can be achieved by tailoring the layers' amount and grating widths so that the proposed structure can be applicable for several optical applications. Moreover, we demonstrate the switching/bistability behaviors of the MDG at Fano resonance which provide a significant switching intensity reduction compared to the established Lorentzian resonant structures.
本文报道并对多层介质光栅（MDG）中产生的法诺共振的光谱特性进行了数值研究。我们研究了由大量相同交替的硫系玻璃（AsS）和二氧化硅（SiO）多层组成的MDG，结构中刻有几种光栅宽度，重点关注品质（Q）因子和非对称（q）因子。通过调整层数和光栅宽度，可以实现对法诺线形及其线性特性的调控，从而使所提出的结构适用于多种光学应用。此外，我们展示了MDG在法诺共振时的开关/双稳行为，与已有的洛伦兹共振结构相比，其开关强度显著降低。
