期刊
SCIENCE ADVANCES
卷 6, 期 29, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb4142
关键词
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资金
- Moore Inventor Fellow award from the Gordon and Betty Moore Foundation
- National Aeronautics and Space Administration Early Career Faculty Award (NASA ECF) [80NSSC17K0528]
- Office of Naval Research (ONR) Basic Research Challenge (BRC) [N00014-18-1-2371]
- Penn State MRSEC, the Center for Nanoscale Science [NSF DMR-1420620]
Metasurfaces with unparalleled controllability of light have shown great potential to revolutionize conventional optics. However, they mainly require external light excitation, which makes it difficult to fully integrate them on-chip. On the other hand, integrated photonics enables packing optical components densely on a chip, but it has limited free-space light controllability. Here, by dressing metasurfaces onto waveguides, we molded guided waves into any desired free-space modes to achieve complex free-space functions, such as out-of-plane beam deflection and focusing. This metasurface also breaks the degeneracy of clockwise- and counterclockwise-propagating whispering gallery modes in an active microring resonator, leading to on-chip direct orbital angular momentum lasing. Our study shows a viable route toward complete control of light across integrated photonics and free-space platforms and paves a way for creating multifunctional photonic integrated devices with agile access to free space, which enables a plethora of applications in communications, remote sensing, displays, etc.
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