Observation of Frequency-Locked Coherent Terahertz Smith-Purcell Radiation

Korbly, Stephen E.; Kesar, Amit S.; Sirigiri, J.R.; Temkin, Richard J.

doi:10.1103/physrevlett.94.054803

Cited by 219 publications

(140 citation statements)

References 13 publications

(9 reference statements)

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“…repetition frequency f b . As the number of the electron bunches N M increases, the bandwidth near f b decreases, being inversely proportional to N M , which agrees well with the theory prediction [36,38]. In particular, the spectral energy is found as…”

Section: Numerical Simulation Of a Prebunched Electron Beam In An supporting

confidence: 78%

“…When the electrons appear in periodic bunches, the coherent radiation from the bunches train interfere constructively, in directions where the frequency of the SPR is an integer multiple of the bunch repetition frequency, and significantly enhance the SPR emission in these directions. In 2005, Korbly et al demonstrated such coherent harmonic SPR from a train of prebunched electrons experimentally [38]. Another distinct feature of the SPR excitation from prebunched electron beams is that the frequency and the direction of the radiation can be controlled by the beam bunching frequency, even for a given beam energy and fixed grating parameters, in contrast to the SPR excitation from a continuous beam, where the radiation is emitted in all directions in a continuous range of angle-dependent frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Zhang

Ang

Gover

2015

Phys. Rev. ST Accel. Beams

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This paper studies various mechanisms to enhance the coherent Smith-Purcell radiation (SPR) at terahertz frequencies using particle-in-cell (PIC) simulations. A simple analytical dispersion relation is derived to predict the frequency of the evanescent surface wave of the open grating, which is excited by a backward-wave oscillation mechanism and emits radiation at harmonics of this frequency, and the cavity mode frequencies of the Orotron-like device, all in excellent agreement with the simulation data. The grating parameters are optimized to minimize the starting current of a continuous electron beam for exciting coherent SPR. It is demonstrated that a prebunched beam can be used to selectively excite coherent SPR at desired SPR angle and frequencies that are higher harmonics of the beam bunching frequency, where the starting current requirement is eliminated. Our PIC simulations show the dynamics of modes development and competition for the Orotron-like open cavity structure, which owns a lower starting current than the surface mode process. This oscillation mode dominates at steady state and enhances the radiated power by more than 2 orders of magnitude.

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Section: Numerical Simulation Of a Prebunched Electron Beam In An supporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Zhang

Ang

Gover

2015

Phys. Rev. ST Accel. Beams

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show abstract

“…[1][2][3] This has spurred growing interest in terahertz source and detector technologies [4][5][6][7][8][9] for use in novel sensing and communication systems. To facilitate continued developments, measurement tools and techniques to characterize terahertz optical properties of materials, components, and systems are consequently needed.…”

Section: Introductionmentioning

confidence: 99%

Variable-wavelength frequency-domain terahertz ellipsometry

Hofmann

Herzinger

Boosalis

et al. 2010

Review of Scientific Instruments

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We report an experimental setup for wavelength-tunable frequency-domain ellipsometric measurements in the terahertz spectral range from 0.2 to 1.5 THz employing a desktop-based backward wave oscillator source. The instrument allows for variable angles of incidence between 30°and 90°and operates in a polarizer-sample-rotating analyzer scheme. The backward wave oscillator source has a tunable base frequency of 107-177 GHz and is augmented with a set of Schottky diode frequency multipliers in order to extend the spectral range to 1.5 THz. We use an odd-bounce image rotation system in combination with a wire grid polarizer to prepare the input polarization state. A highly phosphorous-doped Si substrate serves as a first sample model system. We show that the ellipsometric data obtained with our novel terahertz ellipsometer can be well described within the classical Drude model, which at the same time is in perfect agreement with midinfrared ellipsometry data obtained from the same sample for comparison. The analysis of the terahertz ellipsometric data of a low phosphorous-doped n-type Si substrate demonstrates that ellipsometry in the terahertz spectral range allows the determination of free charge-carrier properties for electron concentrations as low as 8 ϫ 10 14 cm −3 .

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“…Alternatively one can use an undulator, creating a THz free electron laser (FEL). Grating structures can be used to excite a THz Smith-Purcell radiation [18]. Finally, one can use coherent Cherenkov radiation (CCR) [19,20].…”

Section: Thz Extractionmentioning

confidence: 99%

Terahertz radiation source based on self-wake beam bunching

Antipov¹,

Jing²,

Schoessow³

et al. 2013

AIP Conference Proceedings

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Argonne National Laboratory, Argonne IL, 60439, USA Abstract. A table top device for producing high power T-ray beams is described. A rectangular electron beam that can be produced out of a photoinjector via stacking of the laser pulse, and running off-crest of the photoinjector rf is sent through a dielectric loaded waveguide. Due to the beam's self-wake its energy becomes modulated. In the chicane beamline following the dielectric energy-bunching section this energy modulation is converted to a density modulationa bunch train. The density modulated beam can be sent through a power extraction section, like a dielectric loaded accelerating structure, or simply can intercept a foil target, producing THz radiation of various bandwidths and power levels.

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Observation of Frequency-Locked Coherent Terahertz Smith-Purcell Radiation

Cited by 219 publications

References 13 publications

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Variable-wavelength frequency-domain terahertz ellipsometry

Terahertz radiation source based on self-wake beam bunching

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