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Highly efficient transmissive metasurface for polarization control
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DOI：10.1007/s11082-020-02697-8.png)
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Abstract
En 中文
Metasurface-based polarization control is a promising application where significant miniaturization and broadband operation bandwidth can be achieved. Several highly efficient reflective polarization control devices are presented in the literature. However, most transmittive devices suffer from several problems such as having low efficiency (50% or less), limited operation bandwidth and incomplete polarization conversion. From a practical perspective, transmittive polarization controllers are of paramount importance as the feasible applications of the reflective ones are very limited. Thus far, most transmittive structures have a limited control of the polarization. Additionally, CMOS compatibility is not discussed. In this paper, a novel design is presented to generally control the polarization state of the transmitted light, based on triangular-wave shaped connected meta-strips. In this context, a one-layered polarization controller is designed to perform a general control of the phase difference between the two orthogonal electric field components over a tremendous operation bandwidth. Moreover, two flipped resonators are suggested to design a highly efficient broadband transmittive polarization controller. Such a structure provides a high power conversion efficiency up to a peak of 95% over a broadband bandwidth. CMOS compatibility is also achieved for mid infrared operation. Further, the reported structure is subwavelength, where the total thickness of the two-layered quarter-wave plate is equal to 0.2 lambda center. Full-wave simulations are performed using Lumerical finite difference time domain (FDTD) software package.
Keywords:
BROAD-BAND
DESIGN
METAMATERIALS
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