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Electrically tunable silicon plasmonic phase modulators with nano-scale optical confinement

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Frontiers of Optoelectronics 2011年第4期4卷 359-363页

作者： Xiaomeng SUN Linjie ZHOU Xinwan LI jingya xie Jianping CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

Electrically tunable silicon(Si) plasmonic phase modulators with nano-scale optical confinement are presented and analyzed in this study. The modulation is realized based on two mechanisms: free carrier plasma dispersion effect in Si and high electro-optic effect in polymer. The phase modulators can be found potential applications in optical telecommunication and interconnect.

关键词： surface plasmons photonic integrated circuits free carrier plasma dispersion effect electro-optic effect

Broadband achromatic metalens in terahertz regime

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Science Bulletin 2019年第20期64卷 1525-1531页

作者： Qingqing Cheng Meilin Ma Dong Yu Zhixiong Shen jingya xie Juncheng Wang Nianxi Xu Hanming Guo Wei Hu Shuming Wang Tao Li Songlin Zhuang Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System(Ministry of Education) University of Shanghai for Scienceand TechnologyShanghai200093China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesSchool of PhysicsNanjing UniversityNanjing210093China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China

Achromatic focusing is essential for broadband operation, which has recently been realised from visible to infrared wavelengths using a metasurface. Similarly, multi-terahertz functional devices can be encoded in a desired metasurface phase profile. However, metalenses suffer from larger chromatic aberrations because of the intrinsic dispersion of each unit element. Here, we propose an achromatic metalens with C-shaped unit elements working from 0.3 to 0.8 THz with a bandwidth of approximately 91% over the centre frequency. The designed metalens possesses a high working efficiency of more than 68% at the peak and a relatively high numerical aperture of 0.385. We further demonstrate the robustness of our Cshaped metalens, considering lateral shape deformations and deviations in the etching depth. Our metalens design opens an avenue for future applications of terahertz meta-devices in spectroscopy, time-offlight tomography and hyperspectral imaging systems.

关键词： Far infrared or terahertz Achromatic Metasurface Diffraction theory

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

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

All-silicon low-loss THz temporal differentiator based on microring waveguide resonator platform

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Light(Advanced Manufacturing) 2024年第2期5卷 14-23页

作者： Yunjie Rui Shuyu Zhou Xuecou Tu Xu Yan Bingnan Yan Chen Zhang Ziyao Ye Huilin Zhang jingya xie Qing-Yuan Zhao La-Bao Zhang Xiao-Qing Jia Huabing Wang Lin Kang Jian Chen Peiheng Wu Research Institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjingJiangsu 210023China Hefei National Laboratory Hefei 230088China Purple Mountain Laboratories NanjingJiangsu 211111China Terahertz Technology Innovation Research Institute Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai200093China

Microring resonators have been widely used in passive optical devices such as wavelength division multiplexers,differentiators,and *** on terahertz(THz)components has been accelerated by these photonics *** and integrated time-domain differentiators that enable low-loss,high-speed THz signal processing are necessary for THz *** this study,an on-chip THz temporal differentiator based on all-silicon photonic technology was *** device primarily consisted of a microring waveguide resonator and was packaged with standard waveguide *** performed time-domain differentiation on input signals at a frequency of 405.45 GHz with an insertion loss of 2.5 dB and a working bandwidth of 0.36 *** periodic waveforms could be handled by this *** device could work as an edge detector,which detected step-like edges in high-speed input signals through differential *** development holds significant promise for future THz data processing technologies and THz communication systems.

关键词： Silicon photonics Whispering gallery mode resonator THz silicon waveguide

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研发预算管理的评估模型探讨

河北经贸大学学报 2008年第6期29卷 53-58页

作者：谢静颖中国人民大学商学院北京100000

研究开发是企业核心能力和市场竞争力的保证,研发预算是研发项目负责人使用多重方法评估项目成本和资源需求的行为。研发预算管理涉及项目复杂性和创新性两大指标因素,通过构建实用评估模型和历史模型,归纳出研发项目的四大模型,对企业... 详细信息

研究开发是企业核心能力和市场竞争力的保证,研发预算是研发项目负责人使用多重方法评估项目成本和资源需求的行为。研发预算管理涉及项目复杂性和创新性两大指标因素,通过构建实用评估模型和历史模型,归纳出研发项目的四大模型,对企业有效配置资源的研发提供了借鉴。

关键词：研发预算管理评估模型复杂性创新性