Metasurface provides miniaturized devices for integrated optics.Here,we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian(LG)modes of different orders at various diffra...Metasurface provides miniaturized devices for integrated optics.Here,we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian(LG)modes of different orders at various diffraction angles.The metasurface is fabricated with Au nano-antennas,which vary in length and orientation angle for modulation of both the phase and the amplitude of a scattered wave,on a silica substrate.Our error analysis suggests that the metasurface design is robust over a 400 nm wavelength range.This work presents the manipulation of LG beams through controlling both radial and azimuthal orders,which paves the way in expanding the communication channels by one more dimension(i.e.,radial order)and demultiplexing different modes.展开更多
基金National Natural Science Foundation of China(N_HKU712/16)Research Grants Council,University Grants Committee(CityU T42-103/16-N,E-HKU701/17,HKU 17200219,HKU 17209018,HKU C7047-16G)。
文摘Metasurface provides miniaturized devices for integrated optics.Here,we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian(LG)modes of different orders at various diffraction angles.The metasurface is fabricated with Au nano-antennas,which vary in length and orientation angle for modulation of both the phase and the amplitude of a scattered wave,on a silica substrate.Our error analysis suggests that the metasurface design is robust over a 400 nm wavelength range.This work presents the manipulation of LG beams through controlling both radial and azimuthal orders,which paves the way in expanding the communication channels by one more dimension(i.e.,radial order)and demultiplexing different modes.
