CAJ | 학술논문

提出了一种新型大数值孔径介质结构透镜，能量利用率达到了44%。通过数值仿真FDTD计算证明该聚焦器件能实现高的能量利用率和接近衍射极限的聚焦光斑，且聚焦光斑的旁瓣很小。其次，对该透镜的色散性能进行了研究，发现该透镜具有与普通透镜相反的色散特性。故该透镜可以与普通透镜组合消色差。另外，该透镜克服了最小特征尺寸，实现了大数值孔径，针对波长10.6μm设计了相同口径、不同F数的介质结构透镜，最小F数达到了0.25。
제출료일충신형대수치공경개질결구투경，능량이용솔체도료44%。통과수치방진FDTD계산증명해취초기건능실현고적능량이용솔화접근연사겁한적취초광반，차취초광반적방판흔소。기차，대해투경적색산성능진행료연구，발현해투경구유여보통투경상반적색산특성。고해투경가이여보통투경조합소색차。령외，해투경극복료최소특정척촌，실현료대수치공경，침대파장10.6μm설계료상동구경、불동F수적개질결구투경，최소F수체도료0.25。
A dielectric structured lens formed by varying the high-refractive-index square dielectric holes was proposed. This lens can realize higher energy efficiency compared with the high-refractive-index square dielectric metal structured lens. The energy efficiency has achieved 44% by finite difference and time domain (FDTD) algorithm, and the spot size leads to the diffraction limit. Second, the dispersion characteristic of the lens was researched, it has the counter dispersion characteristic with the geometrical optics lens, so lens group make up of those dielectric structured lens and the geometrical optics lens can be used to clear dispersion. In addition, it overcomes the limitation of feature size of the large numerical aperture (NA) lens, so the large NA lens can be achieved. Four lens with the same aperture but different focus length were designed for the wavelength 10.6μm. The smallest F number has reached 0.25.