Simple and universal method in designs of high-efficiency diffractive optical elements for spectrum

• 作 者: 徐文琪 林冬风 许信 叶佳声 王新柯 冯胜飞 孙文峰 韩鹏 张岩 孟庆波 杨国桢
• 机 构: Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Device
• 出 处: Chinese Physics B
• 发表日期: 2017年07期
• 关键词: universal photovoltaic focusing designated bands grating absorbed Fresnel numeri

Diffractive optical elements(DOEs) with spectrum separation and beam concentration(SSBC) functions have important applications in solar cell systems. With the SSBC DOEs, the sunlight radiation is divided into several wave bands so as to be effectively absorbed by photovoltaic materials with different band gaps. A new method is proposed for designing high-efficiency SSBC DOEs, which is physically simple, numerically fast, and universally applicable. The SSBC DOEs are designed by the new design method, and their performances are analyzed by the Fresnel diffraction integral method.The new design method takes two advantages over the previous design method. Firstly, the optical focusing efficiency is heightened by up to 10%. Secondly, focal positions of all the designed wavelengths can be designated arbitrarily and independently. It is believed that the designed SSBC DOEs should have practical applications to solar cell systems.

Diffractive optical elements (DOEs) with spectrum separation and beam concentration (SSBC) functions have important applications in solar cell systems. With the SSBC DOEs, the sunlight radiation is divided into several wave bands so as to be effectively absorbed by photovoltaic materials with different bands gaps. A new method is proposed for designing high-efficiency SSBC DOEs, which are physically simple, numerically fast, and universally applicable. The SSBC DOEs are designed by the new design method, and their performances are analyzed by the Fresnel diffraction integral method. First, the optical focusing efficiency is heightened by up to 10%. It is believed that the designed focusing can be designated arbitrarily and independently. It is believed that the designed SSBC DOEs should have practical applications to solar cell systems.