19 October 2016 Tuning subwavelength-structured focus in the hyperbolic metamaterials
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Proceedings Volume 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation; 101541U (2016) https://doi.org/10.1117/12.2247145
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
In this paper, we have systematically investigated light propagating in the hyperbolic metamaterials (HMMs) covered by a subwavelength grating. Based on the equal-frequency contour analyses, light in the HMM is predicted to propagate along a defined direction because of its hyperbolic dispersion, which is similar to the self-collimating effects in photonic crystals. By using the finite-difference time-domain, numerical simulations demonstrate a subwavelength bright spot at the intersection of the adjacent directional beams. Different from the images in homogeneous media, the magnetic fields and electric fields at the spot are layered, especially for the electric fields Ez that is polarized to the propagating direction, i.e., the layer normal direction. Moreover, the Ez is hollow in the layer plane and is stronger than the other electric field component Ex. Therefore, the whole electric field is structured and its pattern can be tuned by the HMM’s effective anisotropic electromagnetic parameters. Our results may be useful for generating subwavelength structured light.
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Rong Pan, Zhixiang Tang, Jin Pan, Runwu Peng, "Tuning subwavelength-structured focus in the hyperbolic metamaterials", Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 101541U (19 October 2016); doi: 10.1117/12.2247145; https://doi.org/10.1117/12.2247145
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