期刊
NANOPHOTONICS
卷 8, 期 6, 页码 1087-1093出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0079
关键词
metallic helical metamaterial; optical chirality; single-exposure; femtosecond laser photoreduction
资金
- National Key R&D Program of China [2018YFB1107205, 2016YFA0301302]
- National Natural Science Foundation of China [61590933, 11474010, 11627803]
Metallic helical metamaterials have become the prominent candidates for circular polarizers and other optical-chiral devices as they exhibit strong circular dichroism at a broad operation bandwidth. However, the rapid fabrication of an intertwined double helix with multiple pitch numbers and excellent mechanical strength, electrical conductivity and surface smoothness remains a challenge. We propose and realize the single-exposure femtosecond laser photoreduction of a freestanding, three-dimensional silver double-helix microstructure by the double-helix focal field intensity engineered with a spatial light modulator. At the same time, the photoreduction solution and the laser repetition rate are optimized to further tackle the surface roughness and the thermal flow problems. As a result, the silver double-helix array with the enhanced quality exhibits pronounced optical chirality in a wide wavelength range from 3.5 to 8.5 mu m. This technique paves a novel way to easily and rapidly fabricate metallic metamaterials for chiro-optical devices in the mid-infrared regime.
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