Superradiant terahertz Smith-Purcell radiation from surface plasmon excited by counterstreaming electron beams

Shin, Yung Woo; So, Jin‐Kyu; Jang, Kyu‐Ha; Won, Jong Uk; Srivastava, Anurag; Park, Gun-Sik

doi:10.1063/1.2432270

Cited by 93 publications

(40 citation statements)

References 15 publications

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“…This device is abstractly shown in Fig. 9.1 and is frequently studied in electron-beam driven frequency multiplication processes [17] and certainly it is a promising candidate for producing terahertz radiation [7,[18][19][20]. As discussed in the most of theoretical studies [19] and in experimental ones [21], SPR power is still very low which its origin seems to be from its spontaneous nature.…”

Section: Introductionmentioning

confidence: 97%

Smith-Purcell Based Terahertz Frequency Multiplier: Three Dimensional Analysis

Tavousi

Rostami

et al. 2016

Springer Proceedings in Physics

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In this paper, we numerically investigate on a three dimensional Smith-Purcell (SP) based terahertz frequency multiplier. Frequency multiplication procedure is proposed via learning of spontaneous SP radiation. At low frequency regions, texturing the metallic surfaces would manipulate the spoof surface plasmons (SSPs). Due to electronically exciting of these SSPs in a one-dimensionally extended metallic grating, a strong electron-plasmon momentum coupling develops and electron bunches arise. The evanescent wave releases from both ends of the structure. At the frequency harmonics of these SSPs, an umklapp process redshifts the SSP momentum beyond the light zone and the SP radiation is generated in the span of 0.466-1.1 THz and detected with a maximum peak around 90°(with respect to the grating). The SP radiation center frequency is *0.65 THz. Three dimensional particle-in-cell (PIC) simulations have been performed via finite integral method and the obtained results completely agree with analytic ones.

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Section: Introductionmentioning

confidence: 97%

Smith-Purcell Based Terahertz Frequency Multiplier: Three Dimensional Analysis

Tavousi

Rostami

et al. 2016

Springer Proceedings in Physics

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“…of 50-500 A/cm 2 over the beam cross section is one of the crucial requirements [5][6][7][8]. The previously proposed works mainly adopt two approaches for creating the sheet-beam: (1) direct approach, developing a sheet-beam gun that produces sheet-beam via beam compression in vertical direction using various beam focusing electrodes (BFE) for different cathode shapes [9][10][11], and (2) indirect approach, using a conventional spherical cathode followed by a solenoid lens system to transform circular beam to elliptical beam [12,13], such system would significantly increase the total length of the gun.…”

mentioning

confidence: 99%

Design of Sheet-Beam Electron Gun with Planar Cathode for Terahertz Devices

Srivastava

Wang

et al. 2009

J Infrared Milli Terahz Waves

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The design of a sheet-beam electron gun with planar cathode was made with the help of a three-dimensional electrostatic field solver that was capable of forming a sheet-beam of 19 mA at 12 kV. It uses one-dimensional three-fold beam cross-sectional area compression meets the specific requirement of a beam to be formed of height 30 µm and width 600 µm at the beam-waist position with over 100 A/cm 2 uniform current density and 0.068 π-mm-mrad emittance, typically, for 0.5 THz devices. A novel beam focusing electrode (BFE) provided with extended-corner rectangular-aperture geometry alleviating the commonly encountered sheet-beam formation problem with a gun that uses a conventional BFE, as well as it reduced beam emittance more than 50%. The practicability of the design was tested by the highvoltage, the thermal and structural analyses. Work has been initiated to test the performance of special high current scandate cathode using anode-aperture mapping.

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“…In recent experiments [6]− [8], it has been shown that the SP radiation provide a promising candidate to realize compact and tunable radiation source in the THz region. FELs based on the SP effect are operated in the amplifier and oscillator configurations where the optical feedback is required in the latter case [9]− [14]. Such FELs could be made with much more compact device structure compared to other FELs (e.g., undulator FELs), and therefore may be interesting for application.…”

Section: Introductionmentioning

confidence: 99%

A quantum mechanical analysis of Smith–Purcell free-electron lasers

Fares¹,

Yamada²

2015

Nuclear Instruments and Methods in Physics Research Section A:

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The paper presents a quantum mechanical treatment for analyzing the Smith−Purcell radiation generated by charged particles passing over a periodic conducting structure. In our theoretical model, the electrons interact with a surface harmonic wave excited near the diffraction grating when the electron velocity is almost equal to the phase velocity of the surface wave. Then, the surface harmonic wave is electromagnetically coupled to a radiation mode. The dynamics of electrons is analyzed quantum mechanically where the electron is represented as a traveling electron wave with a finite spreading length. The conversion of the surface wave into a propagating mode is analyzed using the classical Maxwell's equations. In the small−signal gain regime, closed−form expressions for the contributions of the stimulated and spontaneous emissions to the evolution of the surface wave are derived. The inclusion of the spreading length of the electron wave to the emission spectral line is investigated. Finally, we compare our results based on the quantum mechanical description of electron and those based on the classical approach where a good agreement is confirmed.

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Superradiant terahertz Smith-Purcell radiation from surface plasmon excited by counterstreaming electron beams

Cited by 93 publications

References 15 publications

Smith-Purcell Based Terahertz Frequency Multiplier: Three Dimensional Analysis

Smith-Purcell Based Terahertz Frequency Multiplier: Three Dimensional Analysis

Design of Sheet-Beam Electron Gun with Planar Cathode for Terahertz Devices

A quantum mechanical analysis of Smith–Purcell free-electron lasers

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