基于四层等离子激元结构的椭球孔阵列光学漏波天线（英文）

Optical Leaky Wave Antenna with Ellipsoid Holes Array in Four-layer Plasmons Structure

基于四层等离子激元结构(硅-金-硅-二氧化硅),通过在金属层中构造不同的椭球孔阵列,提出了两种不同结构的光学漏波天线,分别为一维对称锥形结构和二维对称锥形结构.基于天线理论和有限元方法,对天线的物理特性进行数值研究。研究结果表明:当工作波长为1 550nm时,这两种光学漏波天线带宽都为80THz(包含了S+-L+波段);当在天线端口处分别填充空气和氮化硅的时候,天线有较低的回波损耗和插入损耗,但对于两种不同的填充物,天线的特性表现出一些差异,例如,在一维对称结构中,天线端口处填充氮化硅时,天线有更少的回波损耗和插入损耗,更低的旁瓣电平,以及更好的方向性.该天线可用于光学集成互连、高度集成的光束控制和空间光通信中.

Based on the four-layer plasmons structure （silicon-metal-silicon-silica）, two types of optical leaky-wave-antennas that have different ellipsoid-hole array structures in the metal layer were proposed. The structures include one-dimensional symmetric tapered array and two-dimensional symmetric tapered array. Based on antenna theory and finite element method, some physical characteristics for the antennas were investigated numerically. It is found that when the operating wavelength is fixed at 1550nm, the two antennas appear ultra wide bandwidth with 80 THz that covers the band of S＋-L＋. With their ports filled in the air and the silicon nitride, respectively, they both show low return loss and insertion loss. But for two types of different filled materials, their characteristics show some differences, for example, in a onedimensional symmetric structure, the antenna has less return loss and insertion loss, lower side lobe level, and better directionality when its ports is filled with silicon nitride. The antenna can be generalized to apply in the fields of optical integrated interconnection, the control of highly integrated optical beam and space optical communication.