摘要
应用标量衍射理论分析了双胶合透镜的三维超分辨成像特性。对于所设计的双胶合透镜,数值模拟表明,焦平面上主瓣的强度是第1旁瓣的57.14倍,是单一个透镜主瓣强度的2.25倍,而主瓣的半径则是单一个透镜的0.49倍;轴线方向上,主瓣与第1旁瓣的强度之比与单一个透镜的基本相同,但是双胶合透镜的焦深则比单一个透镜的小0.25倍。说明双胶合透镜在横向和轴向同时具有较强的超分辨能力。通过与加圆环光瞳或加相位光瞳的方法比较发现,双胶合透镜具有较好的三维成像能力,可以作为共焦3 D成像和近场光学记录的理想光学器件。
The threedimensional supper resolution properties of a doublet are analyzed by the scalar theory of diffraction. The numerical results from the designed doublet show that the intensity of the main disk is 57.14 times as much as that of the secondary disk, and 2.25 times as much as that of the main disk produced by only using a single lens. And the radius of the main disk is 0.49 times as much as that of a single lens. Though the intensity rate of the main disk and the secondary disk along the optical axis is basically the same as that of a single lens, the depth of focus of the doublet is smaller than that of a single lens. These results indicate that the supper resolution in both transeverse and axial directions can be obtained meanwhile by the use of doublet. It is found by comparison that the 3D imaging power of the doublet is better than those of either annular or phase pupils. Therefore, the doublet can become a perfect element in the 3D imaging of confocal microscopes and in nearfield optical recording.
出处
《光学精密工程》
EI
CAS
CSCD
2003年第4期416-420,共5页
Optics and Precision Engineering