Spectrum discretization of Smith–Purcell radiation for efficient multicolor terahertz emission

Li, Weiwei; Liu, Yucheng; Liu, Weihao

doi:10.1088/1361-6463/ab7519

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…For the S-SPR from an array of DNRGs, only a single radiation frequency can be efficiently obtained. In order to realize several radiation frequencies simultaneously, namely to get multi-color radiation, we proposed to a scheme in which every unit of the array consists several DNRGs with different sizes (gradient DNRGs) as shown in Figure 5 [29]. The radiation from different DNRGs cannot be coherent since their resonant frequencies are different, however, the radiation from all DNRGs of the same shape in the array will be coherent, which is exactly the S-SPR illustrated above.…”

Section: S-spr From One-dimensional Gratingsmentioning

confidence: 99%

Free-electron Driven Terahertz Wave Sources Based on Simth-Purcell Effect

Liu¹,

Yu²,

Tao³

2022

Plasma Science and Technology

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Terahertz electromagnetic wave is one of the hottest research topics in nowadays scientific world thanks to its broad applications in material characterization, medical imaging, wireless communication, and security checking etc. Using free-electron beams to interact with periodic structures via the famous Smith-Purcell effect is an efficient way of generating high-power terahertz radiation. In this chapter, we introduce the basic theory and latest developments of the terahertz radiation schemes using a free-electron beam (including continuous electron beam, a single electron bunch, and a train of electron bunches, etc.) to interact with periodic electromagnetic structures, including grating, surface plasmonics, and subwavelength hole arrays, via a special Smith-Purcell effect or Cherenkov-like effect. A kind of free-electron lasers based on the special Smith-Purcell radiation in the terahertz region is proposed and investigated, which can be developed as high-power terahertz wave sources for practical applications.

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Section: S-spr From One-dimensional Gratingsmentioning

confidence: 99%

Free-electron Driven Terahertz Wave Sources Based on Simth-Purcell Effect

Liu¹,

Yu²,

Tao³

2022

Plasma Science and Technology

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“…Smith-Purcell radiation (SPR), which is emitted when a charged particle moves over a periodic structure, is a natural candidate for terahertz sources [12][13][14][15][16][17][18][19][20][21]. As a system performing power conversion, there has been an extensive interest in the enhancement of the SPR since its discovery [22][23][24][25]. * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Smith–Purcell radiation from bound states in the continuum of metallic gratings

Chen¹,

Mao²,

Jin³

et al. 2022

J. Phys. D: Appl. Phys.

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The enhancement of Smith–Purcell radiation (SPR) produced by electrons moving closely to a grating is a longstanding topic of interest. Here, we systematically investigate the resonant enhancement of SPR for planar metallic gratings. Using an analytic solution for the amplitude of SPR, we show that metallic gratings with a small dutycycle support two type of bound states in the continuum (BICs), i.e. symmetry-protected BICs and accidental BICs, both of which enable the SPR to be enhanced by orders of magnitude at the resonant frequency. The required electron energy for the excitation of BICs can be reduced by employing a higher-order diffraction wave for SPR. Our results present a mechanism for enhancing the SPR produced by metallic gratings, and may find applications in free-electron lasers.

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“…In order to obtain SPR spectrum, the SPR signals are generally measured by a spectrally detector [41][42][43]. However, to achieve measurable signal-to-noise ratio, high power SPR is a must, making the measurement troublesome.…”

Section: Introductionmentioning

confidence: 99%

An alternative technique for verification of terahertz Smith–Purcell radiation

Rattanawan¹,

Chulapakorn²,

Tanapirom³

et al. 2021

J. Phys. D: Appl. Phys.

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An alternative technique to verify terahertz (THz) Smith-Purcell radiation (SPR) was proposed by using different grating periods. A compact DC electron gun, serving as a THz source, was modified to generate continuous 35 keV electron beam that passes by a metal-coated silicon grating in order to induce SPR. A design on beam optics to generate high-brightness beam was carried out by using Computer Simulation Technology (CST) Studio Suite ® software package. The optimization of beam parameters was obtained and experimentally performed. Results show that the root-mean-square (rms) beam size (diameter) is about 1 mm when supplying beam current of 200 µA, and rms beam emittance is about 3π mm mrad. The CST simulation software was, furthermore, employed to observe radiation spectra when using different grating structures. A liquid-helium cooled silicon bolometer together with a low-pass filter was used to detect radiation power. The results reveal that incoherent THz signal with power of 1.5 µW cm −2 is observed when the continuous-beam current is about 200 µA. The dependence of THz frequency and power on the grating period, that is associated to the SPR, was also investigated in this work.

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Spectrum discretization of Smith–Purcell radiation for efficient multicolor terahertz emission

Cited by 3 publications

References 27 publications

Free-electron Driven Terahertz Wave Sources Based on Simth-Purcell Effect

Free-electron Driven Terahertz Wave Sources Based on Simth-Purcell Effect

Enhanced Smith–Purcell radiation from bound states in the continuum of metallic gratings

An alternative technique for verification of terahertz Smith–Purcell radiation

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