Boosting photoconductive large-area THz emitter via optical light confinement behind a highly refractive sapphire-fiber lens

D. S. Ponomarev, D. V. Lavrukhin, N. V. Zenchenko, T. V. Frolov, I. A. Glinskiy, R. A. Khabibullin, G. M. Katyba, V. N. Kurlov, T. Otsuji, K. I. Zaytsev

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We report on a sapphire-fiber-based lens that can be used to enhance the emitted THz power of a large-area photoconductive antenna (PCA). Using numerical simulations, we demonstrate that the lens provides a spatial redistribution of the photocarriers density in the PCA's gap. By optimizing the diameter of the sapphire-fiber, one could reach efficient confinement of the photocarriers in the vicinity of the PCA electrodes with a 10-μm gap size for a 220-μmthick sapphire-fiber. This allows enhancing the coupling of the incident electromagnetic waves at the interface between the sapphire fiber and the semiconductor with the antenna terminals by ∼40 times for a single PCA element, as well as boosting the total efficiency of the large-area PCA-emitter up to ∼7-10 times. To validate our approach, we propose a step-by-step process that can be used for the precise and controllable placement of the sapphire-fiber on the surface of a single PCA.

本文言語English
ページ(範囲)1899-1902
ページ数4
ジャーナルOptics Letters
47
7
DOI
出版ステータスPublished - 2022 4月 1

ASJC Scopus subject areas

  • 原子分子物理学および光学

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