Narrowband terahertz emission from a plasma oscillator imbedded in a plasma density gradient

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Kumar, Manoj and Ersfeld, Bernhard and Lee, Jaeho and Park, Dohyun and Kim, Seungyun and Nam, Inhyuk and Kim, Minseok and Jeon, Seongjin and Jaroszynski, Dino A and Suk, Hyyong and Hur, Min Sup (2025) Narrowband terahertz emission from a plasma oscillator imbedded in a plasma density gradient. Physical Review Letters, 134 (1). 015001. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.134.015001)

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Abstract

A novel method is presented for generating radiation using the beat wave of a bifrequency laser pulse to excite plasma oscillations in a plasma slab that has a density gradient. The plasma wave is localized where it is excited resonantly and becomes a plasma oscillator that produces a beam of radially polarized, terahertz radiation. Particle-in-cell simulations and a theoretical analysis are used to demonstrate its main characteristics, such as its narrow bandwidth. The radiator should have useful applications including driving terahertz-band particle accelerators and for pump-probe experiments.

ORCID iDs

Kumar, Manoj, Ersfeld, Bernhard ORCID logoORCID: https://orcid.org/0000-0001-5597-9429, Lee, Jaeho, Park, Dohyun, Kim, Seungyun, Nam, Inhyuk, Kim, Minseok, Jeon, Seongjin, Jaroszynski, Dino A ORCID logoORCID: https://orcid.org/0000-0002-3006-5492, Suk, Hyyong and Hur, Min Sup;
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