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Image resolution and the properties of optical-wave target detection and imaging by using the NR-PC flat lens |
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| Authors: | Tinggen Shen Baoguo Yuan Zhenghua Li Gang Wang |
| Institution: | a Institute of Applied Physics, Jiangsu University, Zhenjiang 212013, China b Department of Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China c Telecommunication T&R Section, Zhenjiang Watercraft College, Zhenjiang 212003, China |
| Abstract: | We used the method of two-dimensional (2D) finite-difference time-domain (FDTD) to study the characteristics of optical-wave target detection and imaging from negative-refraction photonic crystal (NR-PC) flat lens in the paper. The theory of image resolution was introduced. The results show that there exists a transmission peak, with a value far greater than unit, resulting from the influence of the mini-forbidden bands and resonance excitation effect at resonance frequency. And, the refocusing of backscattered optical wave from the target leads to its image with a sub-wavelength lateral resolution and great amplitude as long as the target is placed at the focus of the NR-PC flat lens. And the application of NR-PC flat lens can be extended in optical area, especially in the detection and imaging of small target. |
| Keywords: | Negative-refraction photonic crystal Resonance excitation Refocused lateral scanning Image resolution |
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