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Nanomaterials 2019, 9(2), 168; https://doi.org/10.3390/nano9020168

Black Phosphorus Nano-Polarizer with High Extinction Ratio in Visible and Near-Infrared Regime

1
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, Tianjin 300072, China
2
Nanchang Institute for Microtechnology of Tianjin University, Weijin Road, Tianjin 300072, China
3
Institute of Experimental Physics, Johannes Kepler University Linz, A-4040 Linz, Austria
4
Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
*
Author to whom correspondence should be addressed.
Received: 25 December 2018 / Revised: 23 January 2019 / Accepted: 24 January 2019 / Published: 29 January 2019
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Abstract

We study computationally the design of a high extinction ratio nano polarizer based on black phosphorus (BP). A scattering-matrix calculation method is applied to compute the overall polarization extinction ratio along two orthogonal directions. The results reveal that, with a resonance cavity of SiO2, both BP/ SiO 2 /Si and h-BN/BP/ SiO 2 /Si configurations can build a linear polarizer with extinction ratio higher than 16 dB at a polarized wavelength in the range of 400 nm–900 nm. The polarization wavelength is tunable by adjusting the thickness of the BP layer while the thicknesses of the isotrocpic layers are in charge of extinction ratios. The additional top layer of h-BN was used to prevent BP degradation from oxidation and strengthens the practical applications of BP polarizer. The study shows that the BP/ SiO 2 /Si structure, with a silicon compatible and easy-to-realize method, is a valuable solution when designing polarization functional module in integrated photonics and optical communications circuits. View Full-Text
Keywords: Low-symmetrical 2D materials; black phosphorus; resonance cavity; scattering-matrix calculation; nano polarizer Low-symmetrical 2D materials; black phosphorus; resonance cavity; scattering-matrix calculation; nano polarizer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Shen, W.; Hu, C.; Huo, S.; Sun, Z.; Fan, G.; Liu, J.; Sun, L.; Hu, X. Black Phosphorus Nano-Polarizer with High Extinction Ratio in Visible and Near-Infrared Regime. Nanomaterials 2019, 9, 168.

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