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Mode splitting transmission effect of surface wave excitation through a metal hole array

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Light(Science & Applications) 2013年第1期2卷 192-196页

作者： Lin Chen Yiming Zhu xiaofei zang Bin Cai Zhou Li Le Xie Songlin Zhuang Engineering Research Center of Optical Instrument and System Ministry of EducationShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

The resonant frequencies of the excited surface waves on a metal hole array with respect to the incident angle were studied in the terahertz *** experimental and theoretical results demonstrate that the resonant peak of surface wave excitation splits into two when transmitted through a metal hole array *** high-order mode with resonant frequency above the cutoff frequency fc(plasma frequency effect)has a shorter attenuation length than that of the low-order mode whose resonant frequency is below *** reason is that the high-order mode is a coupled mode consisting of surface wave and hole modes,while the low-order mode is just an excited surface wave(which can be considered as the spoof surface plasmons).Our investigation may open a door to distinguish the spoof surface plasmons and the coupled modes of surface waves and hole modes.

关键词： angular dependence cutoff frequency metal hole arrays surface waves terahertz

Metasurfaces designed by a bidirectional deep neural network and iterative algorithm for generating quantitative field distributions

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Light(Advanced Manufacturing) 2023年第2期4卷 28-38页

作者： Yang Zhu xiaofei zang Haoxiang Chi Yiwen Zhou Yiming Zhu Songlin Zhuang Terahertz Technology Innovation Research Institute and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 JunGong RoadShanghai200093China

Metasurfaces,which are the two-dimensional counterparts of metamaterials,have demonstrated unprecedented capabilities to manipulate the wavefront of electromagnetic waves in a single flat *** various advances in this field,the unique functionalities achieved by metasurfaces have come at the cost of the structural complexity,resulting in a time-consuming parameter sweep for the conventional metasurface *** artificial neural networks provide a flexible platform for significantly improving the design process,the current metasurface designs are restricted to generating qualitative field *** this study,we demonstrate that by combining a tandem neural network and an iterative algorithm,the previous restriction of the design of metasurfaces can be overcome with quantitative field *** proof-of-principle examples,metalenses predicted via the designed network architecture that possess multiple focal points with identical/orthogonal polarisation states,as well as accurate intensity ratios(quantitative field distributions),were numerically calculated and experimentally *** unique and robust approach for the metasurface design will enable the acceleration of the development of devices with high-accuracy functionalities,which can be applied in imaging,detecting,and sensing.

关键词： Metasurfaces Bidirectional deep neural network Iterative algorithm Focal points Vortex

Metasurfaces for manipulating terahertz waves

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Light(Advanced Manufacturing) 2021年第2期2卷 40-64页

作者： xiaofei zang Bingshuang Yao Lin Chen Jingya Xie Xuguang Guo Alexei VBalakin Alexander P.Shkurinov Songlin Zhuang Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai200092China Department of Physics and International Laser Center Lomonosov Moscow State UniversityLeninskie Gory 1Moscow 19991 Russia ILIT RAS-Branch of the FSRC《Crystallography and Photonics》RAS Svyatoozerskaya 1140700ShaturaMoscow RegionRussia

Terahertz(THz)science and technology have attracted significant attention based on their unique applications in non-destructive imaging,communications,spectroscopic detection,and ***,traditional THz devices must be sufficiently thick to realise the desired wave-manipulating functions,which has hindered the development of THz integrated systems and ***,which are two-dimensional metamaterials consisting of predesigned meta-atoms,can accurately tailor the amplitudes,phases,and polarisations of electromagnetic waves at subwavelength resolutions,meaning they can provide a flexible platform for designing ultra-compact and high-performance THz *** review focuses on recent advancements in metasurfaces for the wavefront manipulation of THz waves,including the planar metalens,holograms,arbitrary polarisation control,special beam generation,and active metasurface *** ultra-compact devices with unique functionality make metasurface devices very attractive for applications such as imaging,encryption,information modulation,and THz *** progress report aims to highlight some novel approaches for designing ultra-compact THz devices and broaden the applications of metasurfaces in THz science.

关键词： surfaces designing attractive

Dual-layered metasurfaces for asymmetric focusing

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Photonics Research 2020年第6期8卷 830-843页

作者： BINGSHUANG YAO xiaofei zang ZHEN L LIN CHEN JINGYA XIE YIMING ZHU SONGLIN ZHUANG Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Moderm Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongi UniversityShanghai 200092China

Asymmetric transmission,defined as the difference between the forward and backward transmission,enables a plethora of applications for on-chip integration and ***,the traditional method for asymmetric transmission is to control the propagation direction of the waves,hindering further ***,a kind of two-dimensional metamaterials,have shown an unprecedented ability to manipulate the propagation direction,phase,and polarization of electromagnetic *** we propose and experimentally demonstrate a metasurface-based directional device consisting of a geometric metasurface with spatially rotated microrods and metallic gratings,which can simultaneously control the phase,polarization,and propagation direction of waves,resulting in asymmetric focusing in the terahertz *** dual-layered metasurfaces for asymmetric focusing can work in a wide bandwidth ranging from 0.6 to 1.1 *** flexible and robust approach for designing broadband asymmetric focusing may open a new avenue for compact devices with potential applications in encryption,information processing,and communication.

关键词： asymmetric layered surfaces

Integrated terahertz vortex beam emitter for rotating target detection

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Advanced Photonics 2023年第6期5卷 37-46页

作者： Jingya Xie Jun Qian Tengjiao Wang Linjie Zhou xiaofei zang Lin Chen Yiming Zhu Songlin Zhuang University of Shanghai for Science and Technology Terahertz Technology Innovation Research InstituteShanghai Key Laboratory of Modern Optical SystemShanghaiChina Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina

We propose a terahertz(THz)vortex emitter that utilizes a high-resistance silicon resonator to generate vortex beams with various topological *** the challenge of double circular polarization superposition resulting from the high refractive index contrast,we regulate the transverse spin state through a newly designed second-order grating partially etched on the waveguide’s top *** reflected wave can be received directly by a linearly polarized antenna,simplifying the *** from the tuning feature,a joint detection method involving positive and negative topological charges identifies and detects rotational Doppler effects amid robust micro-Doppler interference *** emitter can be used for the rotational velocity measurement of an on-axis spinning object,achieving an impressive maximum speed error rate of∼2%.This approach holds promise for the future development of THz vortex beam applications in radar target detection and countermeasure systems,given its low cost and potential for mass production.

关键词： vortex beam emitter terahertz rotational Doppler detection

Spin-decoupled metalens with intensity-tunable multiple focal points

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Photonics Research 2021年第6期9卷 1019-1032页

作者： BINGSHUANG YAO xiaofei zang YANG ZHU DAHAI YU JINGYA XIE LIN CHEN SEN HAN YIMING ZHU SONGLIN ZHUANG Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China Focused Photonics(Hangzhou)Inc Hangzhou 310052China Suzhou H&L Instruments LLC Suzhou 215123China

The control of spin electromagnetic(EM)waves is of great significance in optical *** geometric metasurfaces have shown unprecedented capability to manipulate the wavefronts of spin EM waves,it is still challenging to independently manipulate each spin state and intensity distribution,which inevitably degrades metasurface-based devices for further *** we propose and experimentally demonstrate an approach to designing spin-decoupled metalenses based on pure geometric phase,i.e.,geometric metasurfaces with predesigned phase modulation possessing functionalities of both convex lenses and concave *** the illumination of left-/right-handed circularly polarized(LCP or RCP)terahertz(THz)waves,these metalenses can generate transversely/longitudinally distributed RCP/LCP multiple focal *** the helicity-dependent multiple focal points are locked to the polarization state of incident THz waves,the relative intensity between two orthogonal components can be controlled with different weights of LCP and RCP THz waves,leading to the intensity-tunable *** robust approach for simultaneously manipulating orthogonal spin states and energy distributions of spin EM waves will open a new avenue for designing multifunctional devices and integrated communication systems.

关键词： intensity designing illumination

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太赫兹近场涡旋光束的干涉

中国激光 2019年第1期46卷 346-352页

作者：茅晨曦臧小飞朱亦鸣上海理工大学上海市现代光学系统重点实验室上海200093 上海理工大学光电信息与计算机工程学院上海200093

设计了一种近场涡旋光束干涉的微结构阵列。在该阵列中,一对正交排列的矩形小孔构成阿基米德螺旋线。在线偏振太赫兹波的激励下,其左旋和右旋分量分别形成具有异号拓扑荷数的近场涡旋光束,并叠加产生新的电场分布。数值仿真结果表明,通... 详细信息

设计了一种近场涡旋光束干涉的微结构阵列。在该阵列中,一对正交排列的矩形小孔构成阿基米德螺旋线。在线偏振太赫兹波的激励下,其左旋和右旋分量分别形成具有异号拓扑荷数的近场涡旋光束,并叠加产生新的电场分布。数值仿真结果表明,通过调控每个矩形小孔的角度和螺旋线的螺距,可实现任意拓扑荷数的正交涡旋光束的电场叠加。

关键词：物理光学轨道角动量近场涡旋光束干涉

Terahertz out-of-plane coupler based on compact spot-size converter

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Chinese Optics Letters 2022年第2期20卷 60-66页

作者： Hongxiang Zhang Changpei Liang Jian Song Chenzhong Fu xiaofei zang Lin Chen Jingya Xie Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

Low-loss dielectric terahertz(THz) chips are efficient platforms for diverse THz applications. One of the key elements in the chip is the coupler. Most of the available THz couplers are in-plane and couple the THz wave from the metal waveguide to the dielectric waveguide. However, out-of-plane couplers are more suitable for wafer-scale testing and tolerant of alignment variation. In this work, we propose an out-of-plane THz coupler for coupling the antenna to the dielectric waveguide. The device is constructed using a grating and a compact spot-size converter. As the conventional optical spot-size converters that apply directly to THz chips are too large, we have designed a compact spot-size converter based on a tapered waveguide with a lens. The total device is 2.9 cm long and can couple a 7 mm diameter THz beam to a 500 μm wide waveguide. The device can scan the THz beam, radiate the input rectangular waveguide mode to free space, and drive the rotation angle of the fan beam through the scanning frequency. We fabricated the device using a single lithography step on a silicon *** out-of-plane coupling efficiency was found to be ~5 d B at 194 GHz. The fan-beam steering range was found to be around40° in the frequency range of 170–220 GHz. The proposed out-of-plane coupling technique may provide an effective way for THz wafer-scale testing with a higher degree of freedom for on-chip integration. Also, the proposed technique being nonmechanical, beam steering using it, may therefore find applications in THz radar, communication, and sensing.

关键词： terahertz device grating coupler spot-size converter beam steering

Geometric metasurface for polarization synthesis and multidimensional multiplexing of terahertz converged vortices

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Photonics Research 2022年第6期10卷 1517-1532页

作者： YANG ZHU BINBIN LU ZHIYUAN FAN FUYONG YUE xiaofei zang ALEXEI V.BALAKIN ALEXANDER P.SHKURINOV YIMING ZHU SONGLIN ZHUANG Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China Department of Physics Lomonosov Moscow State UniversityMoscow 119991Russia

The investigation of converged twisted beams with a helical phase structure has a remarkable impact on both fundamental physics and practical *** metasurfaces consisting of individually orientated metal/dielectric meta-atoms provide an ultracompact platform for generating converged ***,it is still challenging to simultaneously focus left-handed and right-handed circularly polarized incident beams with pure geometric phase modulation,which hinders the independent operation on topological charges between these two helical *** we propose and experimentally demonstrate an approach to design terahertz geometric metasurfaces that can generate helicity-independent converged vortices with homogeneous polarization states by the superposition of two orthogonal helical vortices with identical topological ***,the multiplexing of polarization-rotatable multiple vortices in multiple dimensions,i.e.,in both longitudinal and transverse directions,and a vortex with an extended focal depth is confirmed by embedding polarization modulation into the geometric *** demonstrated approach provides a new way to simultaneously manipulate orthogonal helical components and expand the design dimension,enabling new applications of geometric metasurface devices in polarization optics,twisted-beam related image and edge detection,high capacity optical communication,and quantum information processing,to name a few.

关键词： converge helical twisted