Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC

Zi-Wen Zhang; Chao-Hai Du; Zi-Chao Gao; Fan-Hong Li; Juan-Feng Zhu; Liang Zhang; Adrian W. Cross; Pu-Kun Liu

doi:10.1109/ICMMT52847.2021.9618020

Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC

Zi-Wen Zhang, Chao-Hai Du, Zi-Chao Gao, Fan-Hong Li, Juan-Feng Zhu, Liang Zhang, Adrian W. Cross, Pu-Kun Liu

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

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Abstract

A free-electron-driven terahertz (THz) source based on coherent Smith-Purcell radiation (SPR) assisted by bound state in the continuum (BIC) is proposed in this paper. A reflection-type quasi-BIC with ultrahigh quality factor is formed by continuously tuning the structural parameter of the compound grating, which results from the wavevectors mismatch between the incident plane wave and the guided mode. When a sheet electron beam flies over the surface of the grating, the SPR will be enhanced at the resonant frequency of the quasi-BIC and become coherent accordingly. The forming process of the BIC through parameter tuning is analyzed, and the frequency spectrum of the coherent SPR wave demonstrates the enhancement effect of the quasi-BIC. The proposed quasi-BIC-assisted coherent THz SPR scheme may bring possibilities to the design and applications based on compact THz sources.

Original language	English
Title of host publication	2021 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Proceedings
Place of Publication	Piscataway, N.J.
Publisher	IEEE
Number of pages	3
ISBN (Electronic)	9781665434379
DOIs	https://doi.org/10.1109/ICMMT52847.2021.9618020
Publication status	Published - 1 Dec 2021
Event	13th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Nanjing, China Duration: 23 May 2021 → 26 May 2021

Conference

Conference	13th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021
Country/Territory	China
City	Nanjing
Period	23/05/21 → 26/05/21

Funding

This work was supported in part by the National Natural Science Foundation of China under contracts 61861130367, NSAF-U1830201, 61531002, and 61971013. It was also supported in part by Newton Advanced Fellowship from Royal Society (NAF/R1/180121), United Kingdom, and the National Key Research and Development Program under contract 2019YFA0210203.

Keywords

diffraction gratings
electron beams
free electron lasers
submillimetre wave imaging

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10.1109/ICMMT52847.2021.9618020

Coherent_Terahertz_Smith-Purcell_Radiation_Assisted_by_Quasi-BIC_AAMAccepted author manuscript, 2.62 MB

Cite this

@inproceedings{81267d5f7234437381c0eeecf048d642,

title = "Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC",

abstract = "A free-electron-driven terahertz (THz) source based on coherent Smith-Purcell radiation (SPR) assisted by bound state in the continuum (BIC) is proposed in this paper. A reflection-type quasi-BIC with ultrahigh quality factor is formed by continuously tuning the structural parameter of the compound grating, which results from the wavevectors mismatch between the incident plane wave and the guided mode. When a sheet electron beam flies over the surface of the grating, the SPR will be enhanced at the resonant frequency of the quasi-BIC and become coherent accordingly. The forming process of the BIC through parameter tuning is analyzed, and the frequency spectrum of the coherent SPR wave demonstrates the enhancement effect of the quasi-BIC. The proposed quasi-BIC-assisted coherent THz SPR scheme may bring possibilities to the design and applications based on compact THz sources.",

keywords = "diffraction gratings, electron beams, free electron lasers, submillimetre wave imaging",

author = "Zi-Wen Zhang and Chao-Hai Du and Zi-Chao Gao and Fan-Hong Li and Juan-Feng Zhu and Liang Zhang and Cross, \{Adrian W.\} and Pu-Kun Liu",

year = "2021",

month = dec,

day = "1",

doi = "10.1109/ICMMT52847.2021.9618020",

language = "English",

booktitle = "2021 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Proceedings",

publisher = "IEEE",

note = "13th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 ; Conference date: 23-05-2021 Through 26-05-2021",

}

Zhang, Z-W, Du, C-H, Gao, Z-C, Li, F-H, Zhu, J-F, Zhang, L, Cross, AW & Liu, P-K 2021, Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC. in 2021 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Proceedings. IEEE, Piscataway, N.J., 13th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021, Nanjing, China, 23/05/21. https://doi.org/10.1109/ICMMT52847.2021.9618020

TY - GEN

T1 - Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC

AU - Zhang, Zi-Wen

AU - Du, Chao-Hai

AU - Gao, Zi-Chao

AU - Li, Fan-Hong

AU - Zhu, Juan-Feng

AU - Zhang, Liang

AU - Cross, Adrian W.

AU - Liu, Pu-Kun

PY - 2021/12/1

Y1 - 2021/12/1

N2 - A free-electron-driven terahertz (THz) source based on coherent Smith-Purcell radiation (SPR) assisted by bound state in the continuum (BIC) is proposed in this paper. A reflection-type quasi-BIC with ultrahigh quality factor is formed by continuously tuning the structural parameter of the compound grating, which results from the wavevectors mismatch between the incident plane wave and the guided mode. When a sheet electron beam flies over the surface of the grating, the SPR will be enhanced at the resonant frequency of the quasi-BIC and become coherent accordingly. The forming process of the BIC through parameter tuning is analyzed, and the frequency spectrum of the coherent SPR wave demonstrates the enhancement effect of the quasi-BIC. The proposed quasi-BIC-assisted coherent THz SPR scheme may bring possibilities to the design and applications based on compact THz sources.

AB - A free-electron-driven terahertz (THz) source based on coherent Smith-Purcell radiation (SPR) assisted by bound state in the continuum (BIC) is proposed in this paper. A reflection-type quasi-BIC with ultrahigh quality factor is formed by continuously tuning the structural parameter of the compound grating, which results from the wavevectors mismatch between the incident plane wave and the guided mode. When a sheet electron beam flies over the surface of the grating, the SPR will be enhanced at the resonant frequency of the quasi-BIC and become coherent accordingly. The forming process of the BIC through parameter tuning is analyzed, and the frequency spectrum of the coherent SPR wave demonstrates the enhancement effect of the quasi-BIC. The proposed quasi-BIC-assisted coherent THz SPR scheme may bring possibilities to the design and applications based on compact THz sources.

KW - diffraction gratings

KW - electron beams

KW - free electron lasers

KW - submillimetre wave imaging

UR - https://www.scopus.com/pages/publications/85123386319

U2 - 10.1109/ICMMT52847.2021.9618020

DO - 10.1109/ICMMT52847.2021.9618020

M3 - Conference contribution book

AN - SCOPUS:85123386319

BT - 2021 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Proceedings

PB - IEEE

CY - Piscataway, N.J.

T2 - 13th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021

Y2 - 23 May 2021 through 26 May 2021

ER -

Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC

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Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)

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Coherent terahertz Smith-Purcell radiation assisted by quasi-BIC

Abstract

Conference

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)

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