期刊
NANOPHOTONICS
卷 9, 期 6, 页码 1321-1340出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0070
关键词
subwavelength structure; silicon photonics; metamaterial; polarization handling; mode multiplexing; optical interconnect
资金
- State Key Research Development Program of China [2019YFB1803903]
- National Natural Science Foundation of China [61835008, 61860206001, 61975115, 61605112]
Subwavelength structures such as subwavelength gratings (SWGs) and subwavelength metamaterials are capable of tailoring the optical properties of materials and controlling the flow of light at the nanoscale. The effective indices of the subwavelength structured strip and slab waveguides can be changed in a wide range by choosing an appropriate duty cycle or a filling factor of silicon, which provides an effective method to manipulate the optical field and achieve effective index matching for functional devices. Recent advances in nanofabrication techniques have made it possible to implement subwavelength structures in silicon strip and slab waveguides. Here we review various approaches used to design subwavelength structures and achieve exotic optical responses and discuss how these structures can be used to realize high-performance silicon photonic devices. Both one-dimensional SWG devices and two-dimensional subwavelength metamaterial devices are covered in this review, including subwavelength structure-based polarization handling devices, mode manipulation devices, and building blocks for integrated optical interconnects. Perspectives on subwavelength structured silicon photonic devices are also discussed.
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