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Volume 15
Issue 18
10.3390/ma15186239
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Article

Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region

by
Yan Liu
1,
Tiesheng Wu
1,2,3,*,
Yiping Wang
2,3,
Zhihui Liu
1,
Weiping Cao
1,
Dan Yang
1,
Zuning Yang
1,
Rui Liu
1,
Xu Zhong
1 and
Junyi Wang
1,*
1
Guangxi Key Laboratory of Wireless Broadband Communication and Signal Processing, School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China
2
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
3
Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
*
Authors to whom correspondence should be addressed.
Materials 2022, 15(18), 6239; https://doi.org/10.3390/ma15186239
Submission received: 11 July 2022 / Revised: 18 August 2022 / Accepted: 5 September 2022 / Published: 8 September 2022
(This article belongs to the Special Issue Advances in Electronic and Optical Properties of Nanostructured Materials)
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Abstract

Beam splitters are vital components in several optical systems. It is highly desirable, and compact beam splitters with ultra-broadband performances, high efficiencies, and large split angles are still being sought. In this paper, we demonstrate and numerically investigate an ultra-broadband and highly efficient optical beam splitter based on a quasi-continuous metasurface. The proposed design is constructed of quasi-continuous triangle-shaped gallium phosphide nanoantennas on a silica substrate. The simple structure can achieve a conversion efficiency and an anomalous transmission intensity above 90% and 0.8 covering the wavelength range of 1537–1826 nm, respectively. The maximum beam split angle in the operating bandwidth reaches 131.84° at the wavelength of 1826 nm. Particularly, the operating bandwidth is still as high as 125 nm with the anomalous transmission intensity above 0.92 and the conversion efficiency exceeding 99%. Moreover, the results show that the performance of the metasurface-based optical beam splitter can be further enhanced by optimizing structural parameters. We also demonstrate the adjustability of the beam splitter by adding refractive index (RI) materials on the surface of the device. The results show that the incident plane wave can be divided into three beams with intensity adjustability. The presented metasurface is very promising in the fields of multiplexers, interferometers, and optical communications, owing to its advantages of ultra-broadband, highly efficient, and large split angle simultaneously.
Keywords: beam splitter; quasi-continuous metasurface; near-infrared region beam splitter; quasi-continuous metasurface; near-infrared region

Share and Cite

MDPI and ACS Style

Liu, Y.; Wu, T.; Wang, Y.; Liu, Z.; Cao, W.; Yang, D.; Yang, Z.; Liu, R.; Zhong, X.; Wang, J. Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region. Materials 2022, 15, 6239. https://doi.org/10.3390/ma15186239

AMA Style

Liu Y, Wu T, Wang Y, Liu Z, Cao W, Yang D, Yang Z, Liu R, Zhong X, Wang J. Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region. Materials. 2022; 15(18):6239. https://doi.org/10.3390/ma15186239

Chicago/Turabian Style

Liu, Yan, Tiesheng Wu, Yiping Wang, Zhihui Liu, Weiping Cao, Dan Yang, Zuning Yang, Rui Liu, Xu Zhong, and Junyi Wang. 2022. "Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region" Materials 15, no. 18: 6239. https://doi.org/10.3390/ma15186239

APA Style

Liu, Y., Wu, T., Wang, Y., Liu, Z., Cao, W., Yang, D., Yang, Z., Liu, R., Zhong, X., & Wang, J. (2022). Ultra-Broadband and Highly Efficient Beam Splitter Based on Quasi-Continuous Metasurface in the Near-Infrared Region. Materials, 15(18), 6239. https://doi.org/10.3390/ma15186239

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