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Multi-function terahertz wave manipulation utilizing Fourier convolution operation metasurface

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Chinese Physics B 2022年第5期31卷 350-354页

作者： Min Zhong Jiu-Sheng Li Centerfor THz Research China Jiliang UniversityHangzhou 310018China

We propose a novel metasurface based on a combined pattern of outer C-shaped ring and inner rectangular *** Fourier convolution operation to generating different predesigned sequences of metasurfaces,we realize various functionalities to flexible manipulate terahertz waves including vortex terahertz beam splitting,anomalous vortex terahertz wave deflection,vortex terahertz wave splitting and deflection *** incident terahertz wave can be flexibly controlled in a single *** designed metasurface has an extensive application prospect in the field of future terahertz communication and sensing.

关键词： Fourier convolution operation metasurface terahertz wave flexible manipulation

Minimal-invasive enhancement of auditory perception by terahertz wave modulation

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Nano Research 2022年第6期15卷 5235-5244页

作者： Xiaoxuan Tan Kaijie Wu Shuang Liu Yifang Yuan Chao Chang Wei Xiong Innovation Laboratory of terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China School of Life Science Tsinghua UniversityBeijing 100071China School of Physics Peking UniversityBeijing 100071China

Hearing impairment is a common disease affecting a substantial proportion of the global ***,the most effective clinical treatment for patients with sensorineural deafness is to implant an artificial electronic ***,the improvements to hearing perception are variable and limited among healthy ***,cochlear implants have disadvantages,such as crosstalk derived from the currents that spread into non-target tissue between the ***,in this work,we describe terahertz wave modulation,a new and minimally invasive technology that can enhance hearing perception in animals by reversible modulation of currents in cochlear hair *** single-cell electrophysiology,guinea pig audiometry,and molecular dynamics simulations,we show that THM can reversibly increase mechano-electrical transducer currents(~50%higher)and voltage-gated K^(+)currents in cochlear hair cells through collective resonance of–C=O *** addition,measurement of auditory brainstem response(ABR)in guinea pigs treated with THM indicated a~10 dB increase in hearing *** study thus reports a new method of highly spatially selective hearing enhancement without introducing any exogeneous gene,which has potential applications for treatment of hearing disorders as well as several other areas of neuroscience.

关键词： terahertz wave neuromodulation hearing enhancement potassium channels cochlea

Smart Processing in Materials Tectonics:Fabrication of Photonic Crystals for terahertz wave Control by Using Micro-Stereolithography

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Tsinghua Science and Technology 2009年第S1期14卷 160-163页

作者： Soshu Kirihara Daisuke Sano Masaru Kaneko Smart Processing Research Center Joining and Welding Research Institute Osaka University Osaka 567-0047 Japan Smart Processing Research Center Joining and Welding Research Institute Osaka University Division of Sustainable Energy and Environmental Engineering Graduate School of Engineering Osaka University

Photonic crystals with three-dimensional dielectric structures were fabricated to control terahertz waves effectively by using micro-stereolithography of a CAD/CAM process. The photonic crystals with a diamond structure composed of acrylic lattice with nanosized alumina particles were fabricated. Dense alumina structures were obtained by successive dewaxing and sintering in an air atmosphere. The electromagnetic wave properties of these samples were measured by using a terahertz spectroscopy device. The micro periodic structures exhibited perfect band gaps in the terahertz range. To control terahertz waves, micrometer sized electromagnetic devices for cavities, filters, and antennas will be necessary.

关键词： diamond photonic crystal band gap micro-stereolithography terahertz wave

Comparison of Pulse terahertz and Continuous wave terahertz in Vacuum Charging Detection

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Comparison of Pulse Terahertz and Continuous Wave Terahertz ...

Simultaneous all-solid-state multi-wavelength lasers——a promising pump source for generating highly coherent terahertz waves

作者： Yong-xu YANG Jun-peng DANG Chuan-qiu LI Jie LUO Jin-xiang DONG Yuxi Power Supply Bureau of Yunnan Power Grid Co. Ltd.

The principle of detecting the vacuum degree of terahertz wave is *** imaging principle,imaging characteristics,imaging speed,and price of pulsed terahertz and continuous wave terahertz are compared and *** conclusion shows that the pulse terahertz frequency is higher in the practicality of vacuum detection,but it is expensive,bulky and inconvenient to operate in the *** wave terahertz imaging has high frequency resolution,low price,short imaging time and practical more sexual.

关键词： Vacuum terahertz pulse Continuous wave terahertz wave Imaging

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Chinese Physics B 2009年第3期18卷 1077-1084页

作者：刘欢徐德刚姚建铨 Institute of Laser and Optoelectronics College of Precision Instrument and Optoelectronics EngineeringTianjin University Center for Photonics and Electronics State Key Laboratory of TribologyDepartment of Precision InstrumentsTsinghua University

A diode-end-pumped Nd：YAG dual-wavelength laser operating at 1319 and 1338 nm is demonstrated. The maximum average output power of the quasi-continuous wave linearly polarized dual-wavelength laser is obtained to be 2.1 W at a repetition rate of 50 kHz with an output power instability of less than 0.38% and beam quality factor M^2 of 1.45. Using the two lines, the highly coherent and narrow linewidth terahertz radiation of 3.23 THz can be generated in an organic 4-N, N-dimethylamino-methyl-stilbazolium tosylate （DAST） crystal. Meanwhile, the multi-wavelength red laser at 659.5, 664 and 669 nm is generated by frequency doubling and sum frequency processes in a lithium triborate （LBO） crystal. The average red laser output power is enhanced up to 1.625 W at a repetition rate of 15 kHz with an output power instability of better than 0.53% and beam quality factor M^2 of 6.05. Using the three lines, it is possible to generate the multi-wavelength THz radiation of 3.3, 3.43 and 6.73 THz in an appropriate difference frequency crystal.

关键词： end-pumped Nd:YAG laser dual-wavelength laser acousto-optic Q-switch terahertz wave

Propagation of terahertz waves in nonuniform plasma slab under “electromagnetic window”

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Chinese Physics B 2022年第3期31卷 399-405页

作者： Hao Li Zheng-Ping Zhang Xin Yang College of Big Data and Information Engineering Guizhou UniversityGuiyang 550025China Semiconductor Power Device Reliability Engineering Research Center of Ministry of Education Guizhou UniversityGuiyang 550025China Key Laboratory of Micro-Nano-Electronics and Software Technology of Guizhou Province Guiyang 550025China

The application of magnetic fields, electric fields, and the increase of the electromagnetic wave frequency are upand-coming solutions for the blackout problem. Therefore, this study considers the influence of the external magnetic field on the electron flow and the effect of the external electric field on the electron density distribution, and uses the scattering matrix method(SMM) to perform theoretical calculations and analyze the transmission behavior of terahertz waves under different electron densities, magnetic field distributions, and collision frequencies. The results show that the external magnetic field can improve the transmission of terahertz waves at the low-frequency end. Magnetizing the plasma from the direction perpendicular to the incident path can optimize the right-hand polarized wave transmission. The external electric field can increase the transmittance to some extent, and the increase of the collision frequency can suppress the right-hand polarized wave cyclotron resonance caused by the external magnetic field. By adjusting these parameters, it is expected to alleviate the blackout phenomenon to a certain extent.

关键词： terahertz wave scattering matrix method(SMM) nonuniform magnetized plasma electric field

Rain Attenuation in the Microwave-to-terahertz waveband

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Wireless Engineering and Technology 2016年第2期7卷 59-66页

作者： Seishiro Ishii Masahiro Kinugawa Shunichiro Wakiyama Shuji Sayama Toshihisa Kamei Department of Information Networks National Institute of Technology Sendai College Sendai Japan Department of Communication Engineering National Defense Academy Yokosuka Japan

In recent years, there has been increased interest in the terahertz waveband for application to ultra-high-speed wireless communications and remote sensing systems. However, atmospheric propagation at these wavelengths has a significant effect on the operational stability of systems using the terahertz waveband, so elucidating the effects of rain on propagation is a topic of high interest. We demonstrate various methods for calculating attenuation due to rain and evaluate these methods through comparison with calculated and experimental values. We find that in the 90 - 225 GHz microwave band, values calculated according to Mie scattering theory using the Best and P-S sleet raindrop size distributions best agree with experimental values. At 313 and 355 GHz terahertz-waveband frequencies, values calculated according to Mie scattering theory using the Weibull distribution and a prediction model following ITU-R recommendations best agree with experimental values. We furthermore find that attenuation due to rain increases in proportion to frequency for microwave-band frequencies below approximately 50 GHz, but that there is a peak at around 100 GHz, above which the degree of attenuation remains steady or decreases. Rain-induced attenuation increases in proportion to the rainfall intensity.

关键词： terahertz wave Microwave Rain Attenuation Weibull Distribution ITU-R

Switchable vortex beam polarization state terahertz multi-layer metasurface

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Chinese Physics B 2022年第11期31卷 309-315页

作者： Min Zhong Jiu-Sheng Li Center for THz Research China Jiliang UniversityHangzhou 310018China

We propose a switchable vortex beam polarization state terahertz multi-layer metasurface,which consists of threelayer elliptical metal crosses,four-layer dielectrics,and two-layer hollow metal circles,which are alternately *** the normal incidence of left-handed circularly polarized(LCP)wave and the right-handed circularly polarized(RCP)waves,the proposed structure realizes three independent control functions,i.e.,focused and vortex beam,vortex beam with different topological charges,and polarization states switching,and azimuth switching of two vortex beams with different polarization *** results show that the proposed metasurface provides a new idea for investigating the multifunctional terahertz wave modulation devices.

关键词： terahertz wave switchable vortex beam polarization states flexible manipulation

Wentzel-Kramer-Brillouin and finite-difierence time-domain analysis of terahertz band electromagnetic characteristics of target coated with unmagnetized plasma

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Journal of Systems Engineering and Electronics 2008年第1期19卷 15-20页

作者： Liu Shaobin Zhou Tao Liu Meilin Hong Wei State Key Lab. of Millimeter waves Southeast Univ. Nanjing 210096 P. R. China Coll. of Information Science &: Technology Nanjing Univ. of Aeronautics & Astronautics Nanjing 210016 P. R. China

We investigate computationally the attenuation and reflection of terahertz （THz） wave using targets coated with plasmas. The simulators are the Wentzel-Kramer-Brillouin （WKB） method and finite-difference timedomain （FDTD） method. The relation between the frequency of the incident electromagnetic （EM） wave and the attenuation caused by unmagnitized plasma is analyzed. The results demonstrate that the amount of absorbed power is a decreasing function of the EM wave frequency and the plasma collision frequency. For THz band incident wave, the attenuation that is caused by plasma is small when the plasma has common density and the collision frequency. This conclusion has fine applying foreground for plasma anti stealth.

关键词： frequency dispersion WKB method FDTD methods unmagnetized plasma terahertz wave