Coherent Smith–Purcell radiation: Theories and simulations

Donohue, J.T.; Gardelle, J.

doi:10.1016/j.nimb.2008.01.020

Cited by 2 publications

(2 citation statements)

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“…Later the same phenomenon was observed in THz and microwave regimes for an electron bunch passing through a thin metal foil (coherent transition radiation) [ 83,84 ] and for an electron bunch passing parallel to a periodic grating (coherent SP). [ 85–87 ] In analogy with previous works, we study the possibility of using a hot electron bunch to enhance the SP emission intensity.…”

Section: Numerical Studies and Discussionmentioning

confidence: 99%

Smith–Purcell Radiation from Highly Mobile Carriers in 2D Quantum Materials

Nussupbekov

Xiong

et al. 2023

Laser & Photonics Reviews

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Terahertz (THz) radiation has broad applications ranging from medical imaging to spectroscopy. One viable source of high‐intensity THz radiation is the Smith–Purcell (SP) effect, which involves charge carriers moving over a periodic surface. Conventional SP emitters use electron beams to generate charge carriers, necessitating bulky electron acceleration stages. Here, a compact design for generating THz SP radiation using mobile charge carriers within 2D materials is proposed. This circumvents the beam alignment and beam divergence challenge, allowing for a reduction in the electron‐grating separation from tens of nm to 5 nm or less, leading to more efficient near‐field excitation and a potentially chip‐level THz source. In such a configuration, it is shown that the optimal electron velocity and the corresponding maximum radiation intensity can be predicted from the electron‐grating separation. The numerical demonstration shows that hot electrons can excite SP radiation in graphene on a silicon grating, and the radiation intensity can be increased by graphene surface plasmons. This study can be extended to a broad variety of charge carriers in 2D materials, thus allowing for compact, tunable, and low‐cost THz sources.

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Section: Numerical Studies and Discussionmentioning

confidence: 99%

Smith–Purcell Radiation from Highly Mobile Carriers in 2D Quantum Materials

Nussupbekov

Xiong

et al. 2023

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…In a companion paper [1], we have described our simulations of coherent Smith-Purcell (SP) radiation using the two-dimensional (2-D) particle-in-cell (PIC) code ''MAGIC". That work provided support for the model proposed by Andrews and Brau [2] for the generation of coherent SP radiation with an initially continuous electron beam.…”

Section: Introductionmentioning

confidence: 99%