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 et al, Phys. Rev. B 65, 201104 (2002)]. This approach to AANR leads to new 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 ∼ d. Our approach can be used to design flat lens with u+v = σd with σ ≫ 1, thus being able to image large and/or far away objects. Our results are confirmed by FDTD simulations.
wave transmission, photonic band gap, all-angle-negative-refraction (AANR)
Photonic crystals, Negative refraction
Huang, Y. J.; Lu, W. T.; and Sridhar, S., "Alternative approach to all-angle negative refraction in two-dimensional photonic crystals" (2007). Physics Faculty Publications. Paper 20. http://hdl.handle.net/2047/d20000373
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