Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas

doi:10.1088/1674-1056/27/9/094217

Abstract

Wavelength demultiplexing waveguide couplers have important applications in integrated nanophotonic devices. Two of the most important indicators of the quality of a wavelength demultiplexing coupler are coupling efficiency and splitting ratio. In this study, we utilize two asymmetric high-index dielectric nanoantennas directly positioned on top of a silicon-on insulator waveguide to realize a compact wavelength demultiplexing coupler in a communication band, which is based on the interference of the waveguide modes coupled by the two nanoantennas. We add a Au substrate for further increasing the coupling efficiency. This has constructive and destructive influences on the antenna's in-coupling efficiency owing to the Fabry-Perot (FP) resonance in the SiO₂ layer. Therefore, we can realize a wavelength demultiplexing coupler with compact size and high coupling efficiency. This coupler has widespread applications in the areas of wavelength filters, on-chip signal processing, and integrated nanophotonic circuits.

Keywords: wavelength demultiplexing coupler high-index dielectric nanoantenna coupling efficiency Fabry-Perot (FP) resonance

Received: 19 April 2018
Revised: 07 June 2018
Accepted manuscript online:

PACS:	42.79.Sz	(Optical communication systems, multiplexers, and demultiplexers?)
	42.82.Et	(Waveguides, couplers, and arrays)
	42.82.-m	(Integrated optics)

Fund:

Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0205700 and 2015CB932403) and the National Natural Science Foundation of China (Grant Nos. 11174062, 51472057, and 21790364).

Corresponding Authors: Jingfeng Tan
E-mail: jftan@pku.edu.cn

Cite this article:

Jingfeng Tan(谭敬丰), Hua Pang(庞画), Fengkai Meng(孟凤凯), Jin Jiang(蒋进) Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas 2018 Chin. Phys. B 27 094217

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Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas

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