Multi-optical effects in two-dimensional photonic crystals of metallic pairs
- 1 June 2022
- journal article
- research article
- Published by IOP Publishing in Europhysics Letters
- Vol. 138 (5), 55005
- https://doi.org/10.1209/0295-5075/ac2e2a
Abstract
Beam steering in photonic crystals is significant in manipulating light beams. In this paper, we design self-collimation, beam splitting, and negative refraction effects in photonic crystals based on metallic pairs immersed in dielectric background. By using a single array of metallic pairs, a broadband and wide-angle self-collimation effect is achieved. Meanwhile, due to the extreme anisotropy, a beam splitting effect is achieved by utilizing the kissing of equi-frequency contours. We then restructure the unit cell with glide symmetry to achieve negative refraction effect in a wide frequency range and realize the effect of flat lens. To illustrate this phenomenon, a flat lens based on the restructured unit cell is designed and numerically demonstrated.Keywords
Funding Information
- National Natural Science Foundation of China (11874311)
- National Natural Science Foundation of China (92050102)
- Fundamental Research Funds for the Central Universities (20720200074)
- National Key Research and Development Program of China (2020YFA0710100)
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