Negative refractive behaviors of 2D triangular-lattice photonic crystals by structure of SiO2/TiO2 layers

Mengxue Li; Mengnan Liu; Chengyi Jiang; Tongtong Liu; Peng Sun; Yong Wan

doi:10.1117/12.2295148

12 January 2018 Negative refractive behaviors of 2D triangular-lattice photonic crystals by structure of SiO₂/TiO₂ layers

Mengxue Li, Mengnan Liu, Chengyi Jiang, Tongtong Liu, Peng Sun, Yong Wan

Author Affiliations +

Proceedings Volume 10620, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology; 106201F (2018) https://doi.org/10.1117/12.2295148
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

In this paper, we propose a two-dimensional (2-D) triangular lattice photonic crystal plate by close-packed SiO2/ TiO2 layers with the stacking mode of ABABABA. By using the finite-difference time-domain (FDTD) method, negative refraction of a single Gaussian beam incident plate with different angles are respectively demonstrated; clear image spots of a point source with normalized frequency ω=0.3605(2πc/a) vertical incident media plate are obtained in the image plane. It can be found that the imaging properties are as same as the isotropic homogeneous medium with refractive index n=-1. The measurement results show that when the distance between the image and the upper surface of the sample V is 5.12a, 3.09a and 1.15a, the distance between the source and the lower surface of the sample U is a, 3a and 5a, respectively. This means that the sum of U and V is mostly equal to the thickness of the plate L and the negative effect of near-perfect lens is realized. This proposed structure with negative refraction properties may have great applications for the design of photonic crystal focusing devices.

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Mengxue Li, Mengnan Liu, Chengyi Jiang, Tongtong Liu, Peng Sun, and Yong Wan "Negative refractive behaviors of 2D triangular-lattice photonic crystals by structure of SiO₂/TiO₂ layers", Proc. SPIE 10620, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology, 106201F (12 January 2018); https://doi.org/10.1117/12.2295148

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KEYWORDS

Negative refraction

Photonic crystals

Titanium dioxide

Finite-difference time-domain method

Refractive index

Silica

Gaussian beams

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