Ultra-wideband Transmissive Linear Polarization Device Based on Graphene

In order to achieve both adjustable wideband and high Polarization Conversion Rate (PCR) of the transmitted waves, a novelty tri-layered structure is proposed for terahertz applications. The Rhombus Hollow Square (RHS) is built up by top and bottom gold gratings on Silicon Dioxide and Polyamide substrate with graphene strips. The proposed polarizer broadens the bandwidth and has well performance. As chemical potential increases, the bandwidth is also broadened by adjusting the graphene. From 0.5 THz to 3 THz, the PCR is greater than 90%, and the relative bandwidth up to 142.9%. The transmission and absorption of polarizer are analyzed at the oblique incidence with chemical potential 0.1eV. By simulating and analyzing the performance, a new result of maintaining broadband and high transmittance in oblique incidence is obtained.

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A 2-Bit Pancharatnam-Berry Coding Metasurface For Ultra-Wideband And Polarization-Insensitive RCS Reduction

10.21203/rs.3.rs-591172/v1 ◽

2021 ◽

Author(s):

Baoqin Lin ◽

Wenzhun Huang ◽

Yong-sheng Yang ◽

Lin-tao Lv ◽

Jianxin Guo ◽

...

Keyword(s):

Reflection Coefficient ◽

Cross Section ◽

Ultra Wideband ◽

Polarization Conversion ◽

Metallic Plate ◽

Excellent Performance ◽

Unit Structure ◽

Relative Bandwidth ◽

Simulation And Experiment ◽

Polarization Insensitive

Abstract Because Pancharatnam-Berry (PB) geometrical phase can only be generated in the co-polarized reflection coefficient under circular polarized (CP) incidence for a reflective metasurface, designing a reflective PB coding metasurface must be based on an appropriate polarization conversion metasurface (PCM), which can realize CP-maintaining reflection. In this work, to design a reflective 2-dit PB coding metasurface for radar cross section (RCS) reduction, an ultra-wideband PCM is proposed at first, the simulated results show that the PCM can realize ultra-wideband CP-maintaining reflection from 8.6 to 35.9 GHz; moreover, PB phase will be generated in its co-polarized reflection coefficient by rotating its unit structure. Thus based on the PCM, an ultra-wideband reflective 2-dit PB coding metasurface is constructed successfully. The simulation and experiment results show that the coding metasurface has excellent performance in RCS reduction under arbitrary polarized incidences, compared with a pure metallic plate with the same size, its RCS can be reduced more than 10dB in the frequency band 8.2-35.2GHz with a relative bandwidth of 124.4%.

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Bi-functional Metasurface Polarizer for Reflected and Transmitted Waves

10.21203/rs.3.rs-936537/v1 ◽

2021 ◽

Author(s):

Xiaojun Huang ◽

Xia Ma ◽

Xuewen Li ◽

Jingdao Fan ◽

Liang Guo ◽

...

Keyword(s):

Electromagnetic Wave ◽

Conversion Rate ◽

Electromagnetic Waves ◽

Oblique Incidence ◽

Surface Current ◽

Axial Ratio ◽

Polarization Conversion ◽

Polarized Waves ◽

Transmitted Waves ◽

Polarization Converters

Abstract Manipulating the polarizations of electromagnetic waves by flexible and diverse means is desirable for a myriad of microwave systems. More recently, metasurfaces offer the promising alternatives to conventional polarization manipulating components because of the flexibility of their geometry could be arbitrarily customized. In this context, a bi-layered metasurface was presented to simultaneously manipulate the polarized states of reflected and transmitted microwaves. No matter whether the incident electromagnetic wave is x-polarized or y-polarized, the reflected and transmitted waves will be converted into orthogonal y- polarized waves at the operating frequency. The designed metasurface has a high polarization conversion rate(PCR) above 90% for both normal and oblique incidence. The experimental results verify the correctness of the simulated results. Finally, axial ratio and surface current distributions were employed to reveal the physics of polarization manipulation. The proposed metasurface will be beneficial to the design of flexible and versatile polarization converters and has great potential for applications in polarization controlled devices and also is believed extendable to higher frequency regimes.

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