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Frontiers of physics 2020年第6期15卷 125-132页

作者： Ying Tian xufeng jing Haiyong Gan Chenxia Li Zhi Hong Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China National Institute of Metrology Beijing 102200China

To enhance transmission eficiency of Pancharatnam Berry(PB)phase metasurfaces,multilayer split-ring resonators were proposed to develop encoding *** per the generalized Snell's law,the deflection angle of the PB phase encoding metasurfaces depends on the metasurface period's ***,it is impossible to design an infinitesimal metasurface unit;consequently,the continuous transmission scattering angle cannot be *** digital signal processing,this study introduces the Fourier convolution principle on encoding metasurface sequences to freely control the trausmitted scattering *** addition and subtraction operations between two diferent encoding sequences were then performed to achieve the continuous variation of the scattering ***,we established that the Fourier convolution principle can be applied to the checkerboard coded metasur-faces.

关键词： metamaterial metasurface scattering Fourier convolution

Ultra-high-Q resonances in terahertz all-silicon metasurfaces based on bound states in the continuum

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Photonics Research 2022年第12期10卷 2743-2750页

作者： PENGFEI WANG FENGYAN HE JIANJUN LIU FANGZHOU SHU BIN FANG TINGTING LANG xufeng jing ZHI HONG Centre for THz Research China Jiliang UniversityHangzhou 310018China

High-Q metasurfaces have important applications in high-sensitivity sensing,low-threshold lasers,and nonlinear optics due to the strong local electromagnetic field *** ultra-high-Q resonances of bound states in the continuum(BIC)metasurfaces have been rapidly developed in the optical regime,it is still a challenging task in the terahertz band for long years because of absorption loss of dielectric materials,design,and fabrication of nanostructures,and the need for high-signal-to-noise ratio and high-resolution spectral ***,a polarization-insensitive quasi-BIC resonance with a high-Q factor of 1049 in a terahertz all-silicon metasurface is experimentally achieved,exceeding the current highest record by 3 times of *** by using this ultra-high-Q metasurface,a terahertz intensity modulation with very low optical pump power is *** proposed all-silicon metasurface can pave the way for the research and development of high-Q terahertz metasurfaces.

关键词： polarization pump high

Broadband silicon-based tunable metamaterial microfluidic sensor

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Photonics Research 2022年第12期10卷 2876-2885页

作者： xufeng jing GUIHONG QIN PENG ZHANG Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China Centre for THz Research China Jiliang UniversityHangzhou 310018China

Tunable metamaterial absorbers play an important role in terahertz imaging and *** propose a multifunctional metamaterial absorber based on doped *** introducing resonance and impedance matching into the absorber,a broadband absorption greater than 90%in the range of 0.8–10 THz is *** the same time,the light regulation characteristics of the doped semiconductor are introduced into the absorber,and the precise amplitude control can be achieved in the range of 0.1–1.2 THz by changing the pump luminous *** addition,based on the principle of light-regulating the concentration of doped silicon carriers,the medium-doped silicon material is replaced by a highly doped silicon material,and a sensor with a sensitivity of up to 500 GHz/RIU is realized by combining the wave absorber with the microfluidic ***,the broadband absorption characteristics and sensing performance of alcohol and water on the prepared device are verified by experiments,indicating that the absorber may have great potential in the field of sensor detection.

关键词： tunable pump absorber

Broadband cross-circular polarization carpet cloaking based on a phase change material metasurface in the mid-infrared region

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Frontiers of physics 2022年第5期17卷 83-91页

作者： Bo Fang Dantian Feng Peng Chen Lijiang Shi Jinhui Cai Jianmin Li Chenxia Li Zhi Hong xufeng jing College of Metrology&Measurement Engineering China Jiliang UniversityHangzhou 310018China Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China Centre for THz Research China Jiliang UniversityHangzhou 310018China Hangzhou Hangxin Qihui Technology Co. LtdHangzhou 310026China University of Shanghai for Science and Technology No.516 Jung Gong RoadShanghai 200093China

In view of the fact that most invisibility devices focus on linear polarization cloaking and that the characteristics of mid-infrared cloaking are rarely studied,we propose a cross-circularly polarized invisibility carpet cloaking device in the mid-infrared *** on the Pancharatnam–Berry phase principle,the unit cells with the cross-circular polarization gradient phase were carefully designed and constructed into a *** order to achieve tunable cross-circular polarization carpet cloaks,a phase change material is introduced into the design of the unit *** the phase change material is in amorphous and crystalline states,the proposed metasurface unit cells can achieve highefficiency cross-polarization conversion,and reflection intensity can be *** to the phase compensation principle of carpet cloaking,we construct a metasurface cloaking device with a phase gradient using the designed unit *** the near-and far-field distributions,the cross-circular polarization cloaking property is confirmed in the broadband wavelength range of 9.3–11.4μ*** proposed cloaking device can effectively resist detection of cross-circular polarization.

关键词： metamaterial metasurface cloaking

Flexible tuning of multifocal holographic imaging based on electronically controlled metasurfaces

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Photonics Research 2024年第1期12卷 61-69页

作者： OWEN ZENG CHENXIA LI BO FANG ZHI HONG xufeng jing Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China Centre for THz Research China Jiliang UniversityHangzhou 310018China College of Metrology&Measurement Engineering China Jiliang UniversityHangzhou 310018China

Programmable hyper-coded holography has the advantage of being programmable as well as being flexibly *** coded metamaterials with excellent electromagnetic modulation capability and the ability to control the phase to modulate the spatial radiation field through external excitation in the form of switching can be used to realize low-cost digital *** design a 1-bit encoded programmable metasurface,which is electrically connected to control the PIN diode in the switching state and to switch the condition of each metasurface cell between“0”and“1.”Using the designed programmable metasurface,we can randomly encode the cell structure to realize single-focus focusing,multi-focusing,and simple holographic letter *** on the nonlinear holographic model,we employ the Gerchberg-Saxton improvement algorithm to modulate the energy distribution at the focus by adjusting the phase ***,we introduce the Fourier convolution principle to regulate the holographic imaging focus flexibly.

关键词： holographic letter excitation

Improvement of terahertz beam modulation efficiency for baseless all-dielectric coded gratings

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Photonics Research 2023年第10期11卷 1738-1750页

作者： JIE JIANG BO FANG CHENXIA LI ZHI HONG xufeng jing Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China Centre for THz Research China Jiliang UniversityHangzhou 310018China College of Metrology&Measurement Engineering China Jiliang UniversityHangzhou 310018China

Optical metasurfaces are two-dimensional ultrathin devices based on single-layer or multilayer arrays of subwave-length nanostructures. They can achieve precise control of phase, amplitude, and polarization on the subwave-length scale. In this paper, a substrate-free all-silicon coded grating is designed, which can realize the phase control of the outgoing beam after the y-polarized plane wave is vertically incident on the metasurface at 0.1 *** a single-layer silicon nanoarray structure, a low-reflection anomalous transmission metasurface is realized, and a variety of different beam deflectors are designed based on these encoded gratings. We propose a coded grating addition principle, which adds and subtracts two traditional coded grating sequences to obtain a new coded grating sequence. The encoded supergrating can flexibly control the scattering angle, and the designed substrate-free all-silicon encoded grating can achieve a deflection angle of 48.59°. In order to verify the principle of coded grating addition, we experimented with cascade operation of two coded sequence gratings to obtain the flexible control of the terahertz beam of the composite supergrating. The principle of grating addition provides a new degree of freedom for the flexible regulation of the terahertz wavefront. At the same time, this method can be extended to the optical band or microwave band, opening up new ways for electromagnetic wave manipulation and beam scanning.

关键词： polarization beam dielectric

All-dielectric double-layer honeycomb tunable metamaterial absorber with integrated gold nanoparticles

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Photonics Research 2024年第10期12卷 2344-2353页

作者： YIXIN LIU YING TIAN CHENXIA LI BO FANG JIANJUN LIU ZHI HONG xufeng jing Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China Centre for THz Research China Jiliang UniversityHangzhou 310018China College of Metrology&Measurement Engineering China Jiliang UniversityHangzhou 310018China College of Information Engineering China Jiliang UniversityHangzhou 310018China

The optical regulation strategy of gold nanoparticles can significantly improve the performance of terahertz *** designed an all-dielectric double-layer honeycomb metamaterial absorber(MA)to demonstrate the broadband terahertz absorption characteristics in the presence or absence of gold *** it does not contain gold nanoparticles,MA exhibits a peak absorption efficiency of over 99%within the bandwidth range of∼486 *** particular,gold nanospheres(AuNPs),gold nanobipyramids(AuNBPs),and gold nanorods(AuNRs)are used to modulate the optical coupling effect of metamaterial absorbers,which improves their modulation *** the simulation,the effective medium theory(EMT)was applied to quantitatively calculate the optical response of a metamaterial absorber with an integrated gold nanoparticle equivalent gold *** integrated gold nanoparticle equivalent gold layer can achieve modulation enhancement of one order of *** the experiment,our process is compatible with CMOS technology,which may contribute to the development of terahertz *** addition,the tunability and modulation enhancement characteristics demonstrated are beneficial for creating dynamic functional terahertz devices,such as THz modulators and switches.

关键词： nanoparticles absorber dielectric

Resonant transparency of a planar anapole metamaterial at terahertz frequencies

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Photonics Research 2021年第2期9卷 125-130页

作者： XIANGJUN LI JIE YIN JIANJUN LIU FANGZHOU SHU TINGTING LANG xufeng jing ZHI HONG Centre for THz Research China Jiliang UniversityHangzhou 310018China

Anapole metamaterials have attracted growing attention in recent years due to their unique nonradiating and nontrivial properties. Although anapole modes have been demonstrated in metamaterials with threedimensional structures, the design and realization of planar anapole metamaterials in a wide frequency range is still a big challenge. Here we propose and experimentally demonstrate a planar anapole metamaterial consisting of dumbbell-shaped apertures on a stainless-steel sheet at terahertz frequencies. The planar metamaterial can generate a resonant transparency in the terahertz spectrum due to the excitation of the anapole ***, the frequency of anapole-induced resonant transparency can be tuned easily in the range of 0.15–0.93 THz by simply varying one geometric parameter of the dumbbell apertures. We anticipate that the resonant transparency in planar anapole metamaterials can be potentially used in filters, sensors, or other photonic devices.

关键词： planar transparency resonant

Broadening and enhancing 2.7 μm emission spectra in Er/Ho co-doped oxyfluoride germanosilicate glass ceramics by imparting multiple local structures to rare earth ions

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Photonics Research 2018年第4期6卷 339-345页

作者： QUNHUO LIU YING TIAN WENHUA TANG FEIFEI HUANG xufeng jing JUNJIE ZHANG SHIQING XU College of Materials Science and Engineering China Jiliang University Institute of Optoelectronic Technology China Jiliang University

Er/Ho co-doped oxyfluoride germanosilicate glass and glass ceramics are prepared and compared. The results indicate that the glass consists of SiO_4 and GeO_4 structural units, while the network of the glass ceramics consists of SiO_4, GeO_4, and GeO_6 units together with NaYF_4 nanocrystals. The presence of multiple local structures in glass ceramics creates a range of dipole environments, which is beneficial to the broadening of 2.7 μm *** other reasons are attributed to the broadening of 2.7 μm emission in glass ceramics: the energy-level splitting of Er^(3+) and the enhancement of the Ho^(3+):~5I_6→~5I_7 transition in NaYF_4 nanocrystals.

关键词：微晶玻璃网络技术通讯技术发展现状

Thermal and luminescent properties of 2 μm emission in thulium-sensitized holmium-doped silicate-germanate glass

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Photonics Research 2016年第6期4卷 214-221页

作者： Rong Chen Ying Tian Bingpeng Li xufeng jing Junjie Zhang Shiqing Xu Hellmut Eckert Xianghua Zhang College of Materials Science and Engineering China Jiliang University Institute of Optoelectronic Technology China Jiliang University Institut für Physikalische Chemie WWU Münster Laboratory of Glasses and Ceramics UMR 6226 CNRS-University of Rennes Cedex

In this paper, we present the luminescent properties of Tm^(3+)∕Ho^(3+)co-doped new glass. A series of silicategermanate glass was prepared by the conventional melt-quenching method. In the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass, a strong emission of 2 μm originating from the Ho^(3+):~5I_7→~5I_8transition can be observed under conventional 808 nm pumping. The characteristic temperatures, structure, and absorption spectra have been measured. The radiative properties of Ho^(3+)in the prepared glass were calculated. The emission cross section of Ho^(3+)ions transition can reach 4.78 × 10^(-21)cm^2 around 2 μm, and the FWHM is as high as 153 nm. The energy transfer efficiency between Ho^(3+)and Tm^(3+)has a large value(52%), which indicates the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass is a suitable candidate for the 2 μm laser. Moreover, the energy transfer mechanism between Tm^(3+)and Ho^(3+)ions was investigated.

关键词： Ho Tm Thermal and luminescent properties of 2 m emission in thulium-sensitized holmium-doped silicate-germanate glass