Advanced Photonics, Volume. 2, Issue 3, 036001(2020)
Subwavelength self-imaging in cascaded waveguide arrays
Fig. 1. Superlens design with cascaded waveguides. (a) Negative refractive index material for superlens imaging. (b) Examples of hyperbolic metamaterials: multilayered metal–dielectric structure and nanorod arrays (top panel) and isofrequency surfaces of extraordinary waves in hyperbolic metamaterials (bottom panel). (c) Compensated positive and negative coupling in waveguide array for superlensing. (d) Dispersion relation for positive and negative coupling. The red arrows indicate the energy flow.
Fig. 2. Simulation results in 1-D silicon waveguide arrays. (a) Coupling coefficient as a function of the period of waveguides, where the red dot indicates the period we selected in our modeling. (b) Theoretical and simulated effective coupling coefficient
Fig. 3. Experimental results. (a) Schematics of the experimental samples with three enlarged pictures showing three different waveguide arrays. (b) SEM images of the fabricated cascaded samples. (c)–(e) CCD recorded optical propagation from input (
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Wange Song, Hanmeng Li, Shenglun Gao, Chen Chen, Shining Zhu, Tao Li, "Subwavelength self-imaging in cascaded waveguide arrays," Adv. Photon. 2, 036001 (2020)
Category: Research Articles
Received: Feb. 14, 2020
Accepted: Apr. 23, 2020
Posted: Apr. 23, 2020
Published Online: May. 13, 2020
The Author Email: Tao Li (taoli@nju.edu.cn)