Leaky-wave metasurfaces for integrated photonics

被引:0
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作者
Heqing Huang
Adam C. Overvig
Yuan Xu
Stephanie C. Malek
Cheng-Chia Tsai
Andrea Alù
Nanfang Yu
机构
[1] Columbia University,Department of Applied Physics and Applied Mathematics
[2] City University of New York,Photonics Initiative, Advanced Science Research Center
[3] Graduate Center of the City University of New York,Physics Program
来源
Nature Nanotechnology | 2023年 / 18卷
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摘要
Metasurfaces have been rapidly advancing our command over the many degrees of freedom of light; however, so far, they have been mostly limited to manipulating light in free space. Metasurfaces integrated on top of guided-wave photonic systems have been explored to control the scattering of light off-chip with enhanced functionalities—namely, the point-by-point manipulation of amplitude, phase or polarization. However, these efforts have so far been limited to controlling one or two optical degrees of freedom at best, as well as device configurations much more complex compared with conventional grating couplers. Here we introduce leaky-wave metasurfaces, which are based on symmetry-broken photonic crystal slabs that support quasi-bound states in the continuum. This platform has a compact form factor equivalent to the one of grating couplers, but it provides full command over the amplitude, phase and polarization (four optical degrees of freedom) across large apertures. We present devices for phase and amplitude control at a fixed polarization state, and devices controlling all the four optical degrees of freedom for operation at a wavelength of 1.55 μm. Merging the fields of guided and free-space optics through the hybrid nature of quasi-bound states in the continuum, our leaky-wave metasurfaces may find applications in imaging, communications, augmented reality, quantum optics, LIDAR and integrated photonic systems.
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页码:580 / 588
页数:8
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