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| 1 | Nonlinear terahertz devices utilizing semiconducting plasmonic metamaterials显示文摘The development of responsive metamaterials has enabled the realization of compact tunable photonic devices capable of manipulating the amplitude,polarization,wave vector and frequency of light.Integration of semiconductors into the active regions of metallic resonators is a proven approach for creating nonlinear metamaterials through optoelectronic control of the semiconductor carrier density.Metal-free subwavelength resonant semiconductor structures offer an alternative approach to create dynamic metamaterials.We present InAs plasmonic disk arrays as a viable resonant metamaterial at terahertz frequencies.Importantly,InAs plasmonic disks exhibit a strong nonlinear response arising from electric field-induced intervalley scattering,resulting in a reduced carrier mobility thereby damping the plasmonic response.We demonstrate nonlinear perfect absorbers configured as either optical limiters or saturable absorbers,including flexible nonlinear absorbers achieved by transferring the disks to polyimide films.Nonlinear plasmonic metamaterials show potential for use in ultrafast terahertz(THz)optics and for passive protection of sensitive electromagnetic devices. | Huseyin R Seren Jingdi Zhang George R Keiser Scott J Maddox Xiaoguang Zhao Kebin Fan Seth R Bank Xin Zhang Richard D Averitt | 2016 | Light(Science & Applications)2016，5，1： | 4 |
| 2 | Frequency-domain diagonal extension imaging显示文摘The pixel size of a charge-coupled device(CCD)camera plays a major role in the image resolution,and the square pixels are attributed to the physical anisotropy of the sampling frequency.We synthesize the high sampling frequency directions from multiple frames acquired with different angles to enhance the resolution by 1.4×over conventional CCD orthogonal sampling.To directly demonstrate the improvement of frequency-domain diagonal extension(FDDE)microscopy,lens-free microscopy is used,as its resolution is dominantly determined by the pixel size.We demonstrate the resolution enhancement with a mouse skin histological specimen and a clinical blood smear sample.Further,FDDE is extended to lens-based photography with an ISO 12233 resolution target.This method paves a new way for enhancing the image resolution for a variety of imaging techniques in which the resolution is primarily limited by the sampling pixel size,for example,microscopy,photography,and spectroscopy. | Shan Jiang Meiling Guan Jiamin Wu Guocheng Fang Xinzhu Xu Dayong Jin Zhen Liu Kebin Shi Fan Bai Shu Wang Peng Xi | 2020 | Advanced Photonics2020，2，3： | 3 |
| 3 | Enhancement of Fe3O4/Au Composite Nanoparticles Catalyst in Oxidative Degradation of Methyl Orange Based on Synergistic Effect显示文摘Fe 3 O 4/Au nanoparticles (Fe 3 O 4/Au NP ) 催化剂被采用 H 2 O 2 作为氧化剂。评估 Fe 3 O 4/Au nanoparticles,不同降级条件被调查例如催化剂的数量, H 2 O 2 集中和 pH 价值。基于我们的数据,甲基橘子在一短时间完全被降级。提高的催化活动和增加的氧化率常数可以被归功于到 synergistic H 2 O 2 到哦激进,它是强壮的氧化种类之一。而且, Fe 3 O 4/Au nanoparticles 展出了令人满意为潜在的工业申请再循环性能。 | Qin Gao Yan Xing Mingli Peng Yongshuai Liu Zhiyi Luo Yanyan Jin Haiming Fan Kebin Li Chao Chen Yali Cui | 2017 | Chinese Journal of Chemistry2017，35，9： | 2 |
| 4 | A dual band terahertz W J, Zhang Xin, Averitt R metamaterial absorber 显示文摘 | Hu Tao Bingham C M Pilon D Kebin Fan Strikwerda A C Shrekenhamer D Padilla D | 2010 | Journal of Physics D : Applied Physics2010，43，22： | 1 |
| 5 | Directional terahertz holography with thermally active Janus metasurface显示文摘Dynamic manipulation of electromagnetic(EM)waves with multiple degrees of freedom plays an essential role in enhancing information processing.Currently,an enormous challenge is to realize directional terahertz(THz)holography.Recently,it was demonstrated that Janus metasurfaces could produce distinct responses to EM waves from two opposite incident directions,making multiplexed dynamic manipulation of THz waves possible.Herein,we show that thermally activated THz Janus metasurfaces integrating with phase change materials on the meta-atoms can produce asymmetric transmission with the designed phase delays.Such reconfigurable Janus metasurfaces can achieve asymmetric focusing of THz wave and directional THz holography with free-space image projections,and particularly the information can be manipulated via temperature and incident THz wave direction.This work not only offers a common strategy for realizing the reconfigurability of Janus metasurfaces,but also shows possible applications in THz optical information encryption,data storage,and smart windows. | Benwen Chen Shengxin Yang Jian Chen Jingbo Wu Ke Chen Weili Li Yihui Tan Zhaosong Wang Hongsong Qiu Kebin Fan Caihong Zhang Huabing Wang Yijun Feng Yunbin He Biaobing Jin Xinglong Wu Jian Chen Peiheng Wu | 2023 | Light(Science & Applications)2023，12，6： | 1 |
| 6 | A dual band terahertz metamaterial absorber显示文摘 | Hu Tao C M Bingham D Pilon Kebin Fan A C Strikwerda D Shrekenhamer W J Padilla Xin Zhang R D Averitt | | Journal of Physics D: Applied Physics0，，： | 1 |
| 7 | Monoradically luminescent polymers by a super acid-catalyzed polymerization and deep-red electroluminescence显示文摘Luminescent radicals have received great attention recently due to their idiographic luminescent properties and potential 100%utilization efficiency of doublets under electrical excitation.However,luminescent radical polymers are rarely explored owing to their challenging molecular design and synthesis.Herein,we report an efficient approach to construct luminescent radical polymers by a super acid-catalyzed polymerization reaction proceeded at room temperature,which intrinsically avoid the heavy metal catalyst.The obtained polymers exhibit the unique paramagnetic signals,good thermal properties,and excellent photostability.Moreover,the quantifiable electroluminescence of such radical polymers was demonstrated for the first time. | Kebin An Guohua Xie Shaolong Gong Zhanxiang Chen Xiang Zhou Fan Ni Chuluo Yang | 2020 | Science China Chemistry2020，63，9： | 1 |
| 8 | Nonlinear terahertz metamaterial perfect absorbers using GaAs[Invited]显示文摘We investigate the nonlinear response of terahertz(THz) metamaterial perfect absorbers consisting of electric split ring resonators on GaAs integrated with a polyimide spacer and gold ground plane. These perfect absorbers on bulk semi-insulating GaAs are characterized using high-field THz time-domain spectroscopy. The resonance frequency redshifts 20 GHz and the absorbance is reduced by 30% as the incident peak field is increased from 30 to 300 kV/cm. The nonlinear response arises from THz field driven interband transitions and intervalley scattering in the GaAs. To eliminate the Fresnel losses from the GaAs substrate, we design and fabricate a flexible metamaterial saturable perfect absorber. The ability to create nonlinear absorbers enables appealing applications such as optical limiting and self-focusing. | Xiaoguang Zhao Jingdi Zhang Kebin Fan Guangwu Duan Grace D.Metcalfe Michael Wraback Xin Zhang Richard D.Averitt | 2016 | Photonics Research2016，4，3： | 0 |
| 9 | Voltage-tunable dual-layer terahertz metamaterials显示文摘This paper presents the design,fabrication,and characterization of a real-time voltage-tunable terahertz metamaterial based on microelectromechanical systems and broadside-coupled split-ring resonators.In our metamaterial,the magnetic and electric interactions between the coupled resonators are modulated by a comb-drive actuator,which provides continuous lateral shifting between the coupled resonators by up to 20μm.For these strongly coupled split-ring resonators,both a symmetric mode and an anti-symmetric mode are observed.With increasing lateral shift,the electromagnetic interactions between the split-ring resonators weaken,resulting in frequency shifting of the resonant modes.Over the entire lateral shift range,the symmetric mode blueshifts by~60 GHz,and the anti-symmetric mode redshifts by~50 GHz.The amplitude of the transmission at 1.03 THz is modulated by 74%;moreover,a 180°phase shift is achieved at 1.08 THz.Our tunable metamaterial device has myriad potential applications,including terahertz spatial light modulation,phase modulation,and chemical sensing.Furthermore,the scheme that we have implemented can be scaled to operate at other frequencies,thereby enabling a wide range of distinct applications. | Xiaoguang Zhao Kebin Fan Jingdi Zhang George R.Keiser Guangwu Duan Richard D.Averitt Xin Zhang | 2016 | Microsystems & Nanoengineering2016，2，1： | 0 |
| 10 | Highly spatial and temporal bottom-up vehicle emission characterization and its control in a typical ecology-preservation area显示文摘The Chishui River Valley is a microscale ecology-preservation area with industrial clusters.The significance of evaluating vehicular emissions has been gradually highlighted with the rapid development of the local transportation and tourism sectors.This study provides the first estimates based on both bottom-up and top-down approaches.The annual total emissions of CO,NOx,hydrocarbons(HC),PM10,and PM2.5 in 2019 were 347.8,189.6,46.3,6.9,and 6.3 Mg,respectively.Trucks contributed the most(55%)to the NOx emissions,followed by heavy-duty passenger vehicles(26%).In contrast,light-duty passenger vehicles and motorcycles generated 75%of the HC emissions.The superior accuracy of highly spatial and temporal bottom-up estimates versus top-down estimates is validated by the similar variation trends of hourly emission intensities and enhanced concentrations relative to background observations for both NOx and CO,with Pearson correlation coefficients between the intensities and concentrations ranging from 0.79 to 0.85.Historical HC emissions peaked in 2013,followed by a sharp decline in 2014 and a continuous rise since then,whereas NOx emissions have kept increasing since 2010.These indicated the necessity and urgency of effective vehicular emission mitigations.Based on scenario analysis,traffic restrictions combined with upgrading the emission standards of admitted vehicles will possess huge emission reduction potentials.Future recommendations about establishing a low emission zone in the valley and supporting policies were introduced. | Pengju Bie Fanyuan Deng Bi Chen Li Wang Fan Yang Jianguo Zhou Huan Liu Kebin He | 2022 | Eco-Environment & Health2022，1，3： | 0 |
| 11 | Dual-color terahertz spatial light modulator for single-pixel imaging显示文摘Spatial light modulators(SLM),capable of dynamically and spatially manipulating electromagnetic waves,have reshaped modern life in projection display and remote sensing.The progress of SLM will expedite next-generation communication and biomedical imaging in the terahertz(THz)range.However,most current THz SLMs are adapted from optical alternatives that still need improvement in terms of uniformity,speed,and bandwidth.Here,we designed,fabricated,and characterized an 8×8THz SLM based on tunable liquid crystal metamaterial absorbers for THz single-pixel compressive imaging.We demonstrated dual-color compressive sensing(CS)imaging for dispersive objects utilizing the large frequency shift controlled by an external electric field.We developed auto-calibrated compressive sensing(ACS)algorithm to mitigate the impact of the spatially nonuniform THz incident beam and pixel modulation,which significantly improves the fidelity of reconstructed images.Furthermore,the complementary modulation at two absorption frequencies enables Hadamard masks with negative element values to be realized by frequency-switching,thereby halving the imaging time.The demonstrated imaging system paves a new route for THz single-pixel multispectral imaging with high reliability and low cost. | Weili Li Xuemei Hu Jingbo Wu Kebin Fan Benwen Chen Caihong Zhang Wei Hu Xun Cao Biaobing Jin Yanqing Lu Jian Chen Peiheng Wu | 2022 | Light(Science & Applications)2022，11，7： | 0 |
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