中文摘要：

基于光的波动性,提出了一种用于太阳能收集的螺旋纳米天线结构,并利用时域有限差分法对其进行分析。该天线结构由两个共面的阿基米德螺旋臂及基底介质组成,分析了天线的辐射效率和极化特性。新的螺旋纳米天线在400～1600nm的波长范围内（占太阳总能量的85%）可获得高达74.49%的总辐射效率,高于先前学者提出的偶极子天线结构。同时,对于不同方向入射的线极化平面波,螺旋天线馈电间隙处可获得同等量级的局域电场增强,表明该天线能够兼顾太阳光的任意极化特性。

英文摘要：

Based on the fluctuation of light,a spiral nanoantenna structure for solar energy harvesting is proposed and analyzed using finite difference time-domain method.The nanoantenna structure consists of two coplanar Archimedes spiral arms and a substrate layer as supporting.The radiation efficiency and polarization characteristics of the nanoantenna are analyzed.The new spiral nanoantenna achieves a total radiation efficiency of 74.49% within the wavelength range from400 nm to 1600 nm（takes up 85% of the total solar energy）,which is higher than that of dipole antenna structure proposed by previous researchers.Meanwhile,for linearly polarized plane waves from different directions,local electric field enhancement with the same level at the spiral antenna feed gap can be obtained,which indicates that the antenna can process arbitrary polarization characteristics of sunlight.