Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201801273
Keywords
metasurfaces; spin-selective directional coupling; waveguides; wavelength demultiplexing
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Funding
- National Key Research and Development Program of China [2017YFA0303800, 2016YFA0301102]
- National Natural Science Foundation of China [91856101, 11574163, 11774186]
- Natural Science Foundation of Tianjin [16JCQNJC01700]
- 111 Project [B07013]
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A novel approach for the design of a spin-selective directional coupler and spin-selective wavelength demultiplexing device by integrating an all-dielectric metasurface into a silicon nitride waveguide is proposed and demonstrated. Taking advantage of the intrinsic chirality of the electromagnetic field inside the waveguide, the propagation direction of the excited waveguide mode can be easily controlled by the spin and wavelength of the incident light. The coupling efficiency of the spin-selective directional coupler toward one side can reach approximate to 51.6% at 1836 nm. In addition, the working wavelengths, coupling efficiency, peak width, and mode type can be easily tailored by adjusting the geometric parameters of the waveguide and the antenna arrays. This study may provide a further step in the development of photonic integrated circuits, integrated quantum optics, chiral optics, and high-bit-rate telecommunication applications.
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