title: Coherent control of double deflected anomalous modes in ultrathin trapezoid-shaped slit metasurface.
abstract: Coherent light-matter interaction in ultrathin metamaterials has been demonstrated to dynamically modulate intensity, polarization and propagation direction of light. The gradient metasurface with a transverse phase variation usually exhibits an anomalous refracted beam of light dictated by so-called generalized Snell's law. However, less attention has been paid to coherent control of the metasurface with multiple anomalous refracted beams. Here we propose an ultrathin gradient metasurface with single trapezoid-shaped slot antenna as its building block that allows one normal and two deflected transmitted beams. It is numerically demonstrated that such metasurface with multiple scattering modes can be coherently controlled to modulate output intensities by changing the relative phase difference between two counterpropagating coherent beams. Each mode can be coherently switched on/off and two deflected anomalous beams can be synchronously dictated by the phase difference. The coherent control effect in the trapezoid-shaped slit metasurface will offer a promising opportunity for multichannel signals modulation, multichannel sensing and wave front shaping.
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
authors.forename: Y X
authors.initials: YX
authors.lastname: Li
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
authors.forename: C Y
authors.initials: CY
authors.lastname: Guan
authors.affiliation: SZU-NUS Collaborative Innovation Centre for Optoelectronic Science &Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen, China.
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.|SZU-NUS Collaborative Innovation Centre for Optoelectronic Science &Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen, China.
authors.forename: J H
authors.initials: JH
authors.lastname: Shi