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9 October 2021 A photoactive terahertz modulator based on the Cd3As2 thin film
Zijie Dai, Manukumara Manjappa, Ranjan Singh, Yunkun Yang, Faxian Xiu, Weiwei Liu
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Proceedings Volume 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII; 119061B (2021) https://doi.org/10.1117/12.2602694
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
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Abstract
We experimentally demonstrated an optical controlled terahertz modulator based on the 3D Dirac semimetal Cd3As2 thin film (~100 nm, λ/3000). Utilizing the time-resolved terahertz spectroscopy, the photoactive characters of Cd3As2 thin film are investigated. The measurements reveal that Cd3As2 modulator exhibits a low optical threshold (< 63.5 μJ/cm2) and ultrafast (< 20 ps) broadband (0.2-1.5 THz) modulation of terahertz waves. Moreover, integrated with the metamaterials structures, Cd3As2 could potentially be used as photo-sensitive and ultrafast reconfigurable terahertz resonant plasmonic/meta-device.
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Zijie Dai, Manukumara Manjappa, Ranjan Singh, Yunkun Yang, Faxian Xiu, and Weiwei Liu "A photoactive terahertz modulator based on the Cd3As2 thin film", Proc. SPIE 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII, 119061B (9 October 2021); https://doi.org/10.1117/12.2602694
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KEYWORDS
Terahertz radiation
Modulators
Thin films
Ultrafast phenomena
Metamaterials
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