On the use of NR-PC flat lens for square target detection and imaging by lens-combined scanning scheme

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• 作者：Tinggen Shen^a ; ^b ; Feifei Wang^a ; ^{wangfeifei5227747@126.com} ; Wenjuan Meng^b ; Jing Sun^d ; Yang Xu^b ; Zhenghua Li^c ; Baoguo Yuan^a ; Yingfei Lian^a
• 关键词：Effective negative refraction ; Lens-combined scanning scheme ; Scattering signal ; Refocusing resolution
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2012
• 期刊代码：13_00304026
• 类别：et
• 出版时间：July, 2012
• 卷：123
• 期：14
• 页码：1228-1232
• 文件大小：993 K

摘要

In the paper, target detection and imaging from refraction photonic crystal (NR-PC) slab lens is studied by the finite-difference time-domain (FDTD) method. Numerical simulation shows that, there is a transmission peak with a value far greater than unit, resulting from the mini-forbidden bands and resonance excitation at the resonance frequency of 0.3068 (a/位). When a target is placed at the focus point (F₂) of the NR-PC lens, its image and great amplitude could be formed in the vicinity of the point source through the focusing of backscattered optical wave from the target. Further investigation demonstrates that the lens-combined scanning scheme provides higher refocusing resolution than lens-fixed and non-dynamic scanning scheme for square target detection and imaging.