Superoscillatory metalens for polarization conversion and broadband tight focusing of terahertz waves

2022 ◽  
Vol 123 ◽  
pp. 111924
Author(s):  
Zhixiang Wu ◽  
Jiexian Zhu ◽  
Yiyang Zou ◽  
Hu Deng ◽  
Liang Xiong ◽  
...  
Keyword(s):  
Polarization Conversion ◽  
Terahertz Waves ◽  
Tight Focusing

scholarly journals Full 360∘ Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene-Metal Hybrid Metasurfaces

2021 ◽  
Author(s):  
Binxu Wang ◽  
Xiaoqing Luo ◽  
Yalin Lu ◽  
Guangyuan Li
Keyword(s):  
Fermi Energy ◽  
Phase Modulation ◽  
Beam Steering ◽  
Polarization Conversion ◽  
Terahertz Waves ◽  
Dynamic Phase ◽  
Phase Profile ◽  
Profile Design ◽  
Simulation Results ◽  
High Reflectance

Dynamic phase modulation is vital for tunable focusing, beaming, polarization conversion and holography. However, it remains challenging to achieve full 360∘ dynamic phase modulation while maintaining high reflectance or transmittance based on metamaterials or metasurfaces in the terahertz regime. Here we propose a doubly resonant graphene-metal hybrid metasurface to address this challenge. Simulation results show that by varying the graphene Fermi energy, the proposed metasurface with two shifting resonances is capable to provide dynamic phase modulation covering a range of 361∘ while maintaining relatively high reflectance above 20% at 1.05 THz. Based on the phase profile design, dynamically tunable beam steering and focusing are numerically demonstrated. We expect this work will advance the engineering of graphene metasurfaces for the dynamic manipulation of terahertz waves.

scholarly journals Sub-wavelength tight-focusing of terahertz waves by polarization-independent high-numerical-aperture dielectric metalens

2018 ◽  
Vol 26 (23) ◽  
pp. 29817 ◽  
Author(s):  
Hao Chen ◽  
Zhixiang Wu ◽  
Zeyu Li ◽  
Zhenfei Luo ◽  
Xue Jiang ◽  
...  
Keyword(s):  
Numerical Aperture ◽  
Terahertz Waves ◽  
High Numerical Aperture ◽  
Tight Focusing ◽  
Polarization Independent ◽  
Sub Wavelength

Surface Roughness Measurement of Thermal Barrier Coating using Terahertz Waves

2017 ◽  
Vol 137 (3) ◽  
pp. 147-152 ◽  
Author(s):  
Tetsuo Fukuchi ◽  
Norikazu Fuse ◽  
Mitsutoshi Okada ◽  
Tomoharu Fujii ◽  
Maya Mizuno ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Roughness Measurement ◽  
Terahertz Waves ◽  
Surface Roughness Measurement ◽  
Barrier Coating

Nondestructive Testing using Terahertz Waves

2015 ◽  
Vol 135 (11) ◽  
pp. 647-650 ◽  
Author(s):  
Tetsuo Fukuchi ◽  
Norikazu Fuse ◽  
Maya Mizuno ◽  
Kaori Fukunaga
Keyword(s):  
Nondestructive Testing ◽  
Terahertz Waves
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