基于MIM谐振结构的高吸收率太阳能吸波器  

High Absorptivity Solar Absorber Based on MIM Resonant Structure

作　　者：肖功利[1] 陈康 杨宏艳[2] 张家荣 李苗 刘兴鹏 陈赞辉 Xiao Gongli;Chen Kang;Yang Hongyan;Zhang Jiarong;Li Miao;Liu Xingpeng;Chen Zanhui(Key Laboratory of Microelectronic Devices and Integrated Circuits of Guangxi Colleges,School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林电子科技大学信息与通信学院广西高校微电子器件与集成电路重点实验室,广西桂林541004 [2]桂林电子科技大学光电工程学院,广西桂林541004

出　　处：《光学学报》2024年第9期231-239,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62165004,61805053);广西自然科学基金(2023GXNSFAA026108);桂林电子科技大学研究生创新项目(2022YCXS047,2021YCXS040);广西精密导航技术与应用重点实验室主任基金(DH202313)。

摘　　要：实现太阳全光谱辐射的完美吸收并尽可能少地使用光敏材料是太阳能吸波器研究的终极目标。提出了一种基于金属-电介质-金属(MIM)谐振器结构的高吸收率太阳能吸波器。该吸波器以金属钨(W)为衬底,衬底上的多层空心圆盘分别构成了金属(Ti)-相变材料(GST)-金属(Ti)或金属(Ti)-砷化镓(GaAs)-金属(Ti)的MIM谐振器结构。研究结果表明,GaAs和非晶体态GST材料在太阳能吸波器设计方面都有极高的应用价值。该结构在0.3~2.5μm的波长范围内的平均吸收率为97.48%,太阳能光谱加权吸收效率为98.02%;该结构在0.3~4μm的整个工作波段内的平均吸收率为96.95%,太阳能光谱加权吸收效率为97.54%。吸收率大于95%的带宽为2.37μm,吸收率大于90%的带宽为3.57μm。结构自身的对称性使其具备优良的偏振无关特性,有助于吸收太阳光。此外,在0.3~2.5μm波长范围内,该结构对入射角变化表现出稳定的响应。本研究设计的太阳能吸波器具有超宽带和高吸收率的特点,其结构简单,大大降低了制造复杂度和成本。该技术在太阳能收集与转换、光伏器件以及热发射器件等领域具有潜在的应用前景。Objective The development and utilization of new energy sources has always been an important human research field.As a green and renewable energy source,solar energy provides an effective way to alleviate the energy crisis.To date,many methods have been proposed for converting solar radiation into other forms of energy and applications,such as photovoltaics and solar cells,light and heat generators,thermoelectric power generation and solar steam power generation,seawater desalination,and photochemical and photocatalytic reactions.Notably,efficient solar energy capture is the key to realizing these applications.Therefore,the ultimate goal of investigating solar absorbers is to completely absorb solar radiation over the entire spectral range and to employ as little photosensitive material as possible.In the past few years,several methods for efficient absorption of solar radiation have been investigated.For example,black paint is widely adopted but exhibits high absorptivity only in ultraviolet and visible wavelengths,which wastes about 28%of solar energy.However,with technological advancement,metamaterials open up many new ways to manipulate electromagnetic waves,and they have many unique optical properties and have been shown to control the polarization state,amplitude,and phase of electromagnetic waves.Changing the light amplitude is a way to control light absorption.Therefore,it is important to study the perfect absorbers for solar energy based on metamaterials.Methods We design a solar absorber with a multi-layer hollow disk stacked structure based on a metal-dielectric-metal(MIM)resonator structure utilizing GaAs and amorphous GST(A-GST).Additionally,the designed solar absorber is simulated and theoretically analyzed using the finite difference method in time domain(FDTD)and data analysis software Matlab.First,the effect of the structural layer number and the difference in dielectric material per layer(using GaAs or AGST)on the absorption is analyzed,and the structural parameters are optimized for achieving h

关 键 词：表面光学 太阳能吸波器 MIM谐振结构 高吸收率 超宽带 偏振无关 

分 类 号：TN256[电子电信—物理电子学]