科研之友
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摘要
We show that with an appropriate surface modification, a slab of photonic crystal can be made to allow wave transmission within the photonic band gap. Furthermore, negative refraction and all-angle negative refraction (AANR) can be achieved by this surface modification in frequency windows that were not realized before in two-dimensional photonic crystals [C. Luo , Phys. Rev. B 65, 201104 (2002)]. This approach to AANR leads to different applications in flat lens imaging. Previous flat lens using photonic crystals requires object-image distance u+v less than or equal to the lens thickness d, u+v similar to d. Our approach can be used to design a flat lens with u+v=sigma d with sigma >> 1, thus being able to image large and/or far away objects. Our results are confirmed by finite-difference time-domain simulations.
- 出版日期2007-7
- 单位东北大学
