相位阶跃变化型太赫兹波带片  

Phase-stepped-changing Terahertz zone plate

作　　者：鞠智鹏[1,2] 李德华[1,2] 周薇[1] 马建军[1,2] 李乾坤[1,2] 屈操[1,2] 

机构地区：[1]山东科技大学太赫兹研究中心,山东青岛266590 [2]青岛市太赫兹技术重点实验室,山东青岛266590

出　　处：《红外与激光工程》2013年第6期1519-1522,共4页Infrared and Laser Engineering

基　　金：国家自然科学基金(61071016/F010608);青岛市科技计划项目(10-3-4-2-5-jch);山东科技大学研究生科技创新基金(YCB110086)

摘　　要：对相位阶跃变化型太赫兹波带片衍射效率进行了理论研究。根据标量衍射理论,相位阶跃变化型波带片可以完成对高斯光束太赫兹波的聚焦。相位阶跃变化型波带片的衍射规律与薄透镜聚焦的规律相似。对其在光轴以及焦平面上太赫兹强度分布及衍射效率进行了模拟,通过与相位连续变化型,台阶型波带片的衍射效率进行对比分析,结果表明相位阶跃变化型波带片具有更好的衍射效率和性能。计算了一种相位阶跃变化型太赫兹波带片的加工尺寸,适合微机械加工法,有很好的应用价值。Diffraction efficiency investigation of zone plate with stepped phase for terahertz frequencies was presented in this paper. According to Rayleigh-Sommerfeld diffraction theory, the zone plate with phase stepped changing can focus Gaussian beam with high diffraction efficiency. Diffraction law of the phase-stepped-changing zone plate was similar to thin lens. Simulations of intensity distribution and diffraction efficiency in phase-stepped-changing, phase-continuous-changing and phase-correcting Fresnel zone plate were conducted and compared. Results show that the focusing performance and the diffraction efficiency of phase-stepped-changing zone plate is better. A phase-stepped-changing zone plate is calculated. It can be produced by micro-mechanical method.

关 键 词：相位阶跃 衍射光学 太赫兹 波带片 

分 类 号：O434.3[机械工程—光学工程]