Broadband plasmonic metasurface-enabled quarter waveplates with fence-type grating

Aijiao Zhu; Jingpei Hu; Chinhua Wang

doi:10.1117/12.2245964

31 October 2016 Broadband plasmonic metasurface-enabled quarter waveplates with fence-type grating

Aijiao Zhu, Jingpei Hu, Chinhua Wang

Proceedings Volume 10022, Holography, Diffractive Optics, and Applications VII; 100221V (2016) https://doi.org/10.1117/12.2245964
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

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.

Citation Download Citation

Aijiao Zhu, Jingpei Hu, and 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); https://doi.org/10.1117/12.2245964

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KEYWORDS

Wave plates

Polarization

Plasmonics

Nanorods

Silver

Infrared radiation

Optical components

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