کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5449189 | 1512518 | 2017 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Broadband and high efficiency all-dielectric metasurfaces for wavefront steering with easily obtained phase shift
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Broadband and high efficiency all-dielectric metasurfaces for wavefront steering with easily obtained phase shift Broadband and high efficiency all-dielectric metasurfaces for wavefront steering with easily obtained phase shift](/preview/png/5449189.png)
چکیده انگلیسی
All-dielectric metasurfaces for wavefront deflecting and optical vortex generating with broadband and high efficiency are demonstrated. The unit cell of the metasurfaces is optimized to function as a half wave-plate with high polarization conversion efficiency (94%) and transmittance (94.5%) at the telecommunication wavelength. Under such a condition, we can get rid of the complicated parameter sweep process for phase shift selecting. Hence, a phase coverage ranges from 0 to 2Ï can be easily obtained by introducing the Pancharatnam-Berry phase. Metasurfaces composed of the two pre-designed super cells are demonstrated for optical beam deflecting and vortex beam generating. It is found that the metasurfaces with more phase shift sampling points (small phase shift increment) exhibit better performance. Moreover, optical vortex beams can be generated by the designed metasurfaces within a wavelength range of 200Â nm. These results will provide a viable route for designing broadband and high efficiency devices related to phase modulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 405, 15 December 2017, Pages 39-42
Journal: Optics Communications - Volume 405, 15 December 2017, Pages 39-42
نویسندگان
Hui Yang, Yan Deng,