fig3

Figure 3. (A) A metamaterial slab that amplifies the evanescent tails to enhance the optical gradient force, quoted with permission from Ginis et al.^[49]; (B) The bi-periodic honeycomb array with a negative index band (the red line in the lower left panel) and the subwavelength focusing of a super lens, quoted with permission from Kaina et al.^[50]; (C) The symmetry features in the near-field wave systems and the metasources to demonstrate the near-field photonic routing based on the interface mode between ENG and MNG metamaterials, quoted with permission from Long et al.^[51]; (D) The band structure, effective parameters (ε and μ), and reflection phase φ_R of the infinite-periodic PC (ABBA)_N, quoted with permission from Shi et al.^[67]; (E) The transmission spectrum of a system composed of PC1 on the left-hand side and PC2 on the right-hand side (the left panel), the band structure (solid black curve) and Zak phase (labeled in green) of PC1 (the middle panel) and PC2 (the right panel), quoted with permission from Xiao et al.^[68]. ENG: Epsilon-negative; MNG: mu-negative; PC: photonic crystal.