摘要
利用平面屏幕衍射的基尔霍夫理论,模拟计算了波带片在平面光垂直入射情况下的会聚及分光性能。结果表明,菲涅耳波带片(FZP)对垂直入射的平行光具有会聚及分光能力;离轴波带片相对于相同面积的对称波带片对参考光波的聚集能力更强,能获得更加干净的背景。ZEMAX分析表明,偏离中心一定位置的离轴波带片的面积越大,对光波的聚集能力越强,抑噪能力也越强;面积一定的离轴波带片偏离对称波带片中心越小,对光波的聚集能力越强,抑噪能力也越强。提出了利用菲涅耳波带片及卡塞格伦望远镜相结合的组合天线方案,分析表明,该天线具有一定的聚光能力,且抑噪能力相比抛物面天线更强。
The capability of Fresnel zone plate（FZP） for light converging and splitting is calculated for normal incidence plane lights by using the Kirchhoff diffraction formula,and the results show that the capability of light converging and splitting capability is great for normal incident parallel light;the abaxial FZP＇s capability of light converging and splitting exceeds the whole FZP for the same area.The ZEMAX analyses show that the abaxial FZP＇s light converging and noise restraining ability is greater on condition that its area is bigger when it deviates the same distance from the FZP＇s center or the distance it deviates from the FZP＇s center is further when it has the same area.An optical antenna is proposed which is composed of FZP and Cassegrain telescope for atmospheric optical communication.It shows that the antenna can converge light and its noise restraining ability exceeds the paraboloid antenna.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第1期36-42,共7页
Acta Optica Sinica
基金
国家自然科学基金(60607013)资助课题
关键词
光通信
光学天线
菲涅耳波带片
卡塞格伦望远镜
离轴波带片
optical communications optical antenna Fresnel zone plate Cassegrain telescope abaxial Fresnel zone plate
