太阳能收集是解决无线传感器网络能量受限的有效手段.针对传统采用光伏电池收集太阳能的方法易受环境与光照时间限制、吸收波段窄等问题,提出了一种耦合对称U形缝隙的多谐振纳米天线阵列用于太阳能收集.该天线的单元结构是在银介质基板上刻蚀4个对称的U形缝隙,U形缝隙附近产生的表面等离激元相互耦合,使其在宽波段内产生多个谐振点,从而提高宽波段的平均吸收率.利用时域有限差分方法分析了多谐振U形缝隙纳米天线阵列的吸收特性.仿真结果表明,天线阵列在400~870 nm,960~1 100 nm两个波段内吸收率较高,并出现多个吸收峰,吸收峰值最大可以达到99%.%Solar collection is an effective mean to solve the problem that network energy of wireless sensor is limited.A multi-resonant nano-antenna array of coupling and symmetric U-shaped slots was proposed for solar collection, aiming at problems such as that solar collection of traditional photovoltaic battery was easily limited by environment and illumination time as well as problem of narrow absorption bands.4 symmetric U-shaped slots were etched in silver dielectric substrate to obtain this antenna unit structure, and then the mutual coupling of surface plasmons produced in the vicinity of U-shaped slots to generate many resonance points in broadband, thus increasing average absorptivity of broadband.Absorption feature of nano-antenna array of multi-resonant U-shaped slots was analyzed through finite difference time domain method.Simulation result indicates that absorptivity of antenna array is higher in two bands of 400~870 nm and 960~1 100 nm, and there are many absorption peaks.Absorption value can reach 99% maximally.
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