项目名称： 基于红外辐射降低太空LED结温的宽带超材料吸收体研究

项目编号： No.61504078

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 李玉涟

作者单位： 上海海事大学

项目金额： 20万元

中文摘要： LED在航天照明领域具有独特优势，外太空的真空环境切断了LED热对流散热通道，热辐射成为其降温的唯一通道。本项目针对航天LED热辐射散热的需求，提出利用具有红外宽波段近100%吸收率、可见到近红外波段高反射性质的轻薄超材料吸收体作为LED热辐射散热涂层的新想法，通过研究邻近金属层中等离激元耦合效应，揭示等离激元耦合效应对热辐射性质的调控规律以及物理机制。1、通过理论模拟和实验设计超材料吸收体的结构参数，实现多重等离激元共振频域混合达到红外波段宽带近完美吸收效果，实现等离激元的局域性和结构对称性达到大入射角度和全偏振近完美吸收的效果，为进一步研究等离激元之间耦合效应和其在热辐射领域的应用提供理论和实验依据；2、利用光谱移动法精确测量LED结温，验证超材料吸收体在真空环境中对LED降温的有效性。

中文关键词： 发光二极管；结温；超材料吸收体；被动辐射制冷；外太空

英文摘要： The problems about heat dissipation put a great limitation on the development and application of the light emitting diode (LED). The LED is a great technology which is very suitable for the space illumination field. The passive radiative cooling method is the only way for the cooling system of LED used in outer space. For the requirements of the outer space LED cooling system, we propose the new idea about using the infrared broadband near-perfect metamaterial absorber (MA) with high reflection at visible-near infrared area as the thermal radiant cooling projects of the LED, and reveal the law and physics mechanism of the radiation properties tuned by the coupling plasmoic resonance. 1. We design and fabricate the structure of the MA through simulations and experiments, achieve the frequency domain mixed coupling localized plasmon resonance and symmetrical structure to realize the infrared broadband near unity absorption with incident angle and polarization insensitive. The research lays foundation of theory and experiment for the coupling between the plasmon resonances and the application of the thermal radiation field. 2. We use the junction temperature measurement system based on peak-shift theory to demonstrate the validity of the passive radiation refrigeration of MA used in vacuum LED.

英文关键词： LED ;junction temperature;metamaterial absorber ;passive radiation refrigeration ;outer space