31 October 2016 Broadband plasmonic metasurface-enabled quarter waveplates with fence-type grating
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We propose an ultrathin, high-performance quarter waveplate with extreme bandwidth in the near-to-mid infrared wavelength range based on a metasurface consisted of Ag fence-type gratings. The broadband quarter waveplate is realized by optimizing the anisotropic response of the metasurface via changing the geometric dimensions of the fence-type gratings to tailor the interference of light at the subwavelength scale. The near-constant phase difference between two perpendicular electric fields within the broad bandwidth is achieved by manipulating the dimensions of the fence-type gratings along two perpendicular directions in which localized plasmonic resonances along the two directions dominate. Compared to previously reported metasurface-enabled waveplates, the phase retardation of the electric components of the transmitted wave of the proposed structure can be fixed at ~π/2 across a broad wavelength range rather than merely limited within a narrow bandwidth near the resonant wavelength of the metasurface building blocks. Simulation results indicate that a function of quarter waveplates can be realized from 2000nm to 4500nm with the control of polarization orientation of a linearly polarized incident light. Our work gives intriguing possibilities for novel metasurface-enabled optical components with broad bandwidth for photonics devices.
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Aijiao Zhu, Aijiao Zhu, Jingpei Hu, Jingpei Hu, Chinhua Wang, Chinhua Wang, } "Broadband plasmonic metasurface-enabled quarter waveplates with fence-type grating", Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100221V (31 October 2016); doi: 10.1117/12.2245964; https://doi.org/10.1117/12.2245964

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