Accelerating terahertz all-optical modulation by hot carriers effects of silver nanorods in PVA film

Jian Ping Yu, Sai Chen, Fei Fan, Shi Tong Xu, Jie Rong Cheng, Xiang Fan Chen, Lin Xiao, Sheng Jiang Chang

Research output: Contribution to journalArticle

Abstract

While the terahertz regime has proved to be a promising solution for wireless big-data transmission, the lack of available functional devices working in this band seriously constrain the wide engineering applications. In this paper, the silver nanorods in polyvinyl alcohol (PVA) film are developed for enhancing and accelerating THz all-optical modulation. The modulation depth can reach 80% under 0.6W/cm2, and the speed can reach 3kHz which is much faster than our previous research. It has been attributed to the plasmonic hot carriers' effect of the silver nanorods, which makes the photoexcited electrons more easily jump out of the barrier and assemble in the heterostructure between PVA and silicon. Moreover, the photoelectronic response is proved to be related to the plasmonic absorption of the pumping light, which means the modulation speed is decided by the color of the pump light. This experiment phenomenon provides a way to build color-selective terahertz all-optical modulators. Considering its capability for broadband, efficient, and fast modulation of THz waves, this low-cost and conveniently fabricated device could be broadly applied in polymer related THz devices.

Original languageEnglish (US)
Article number075017
JournalAIP Advances
Volume9
Issue number7
DOIs
StatePublished - Jul 1 2019

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polyvinyl alcohol
light modulation
nanorods
silver
modulation
photoelectronics
color
data transmission
modulators
pumping
engineering
pumps
broadband
polymers
silicon
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Accelerating terahertz all-optical modulation by hot carriers effects of silver nanorods in PVA film. / Yu, Jian Ping; Chen, Sai; Fan, Fei; Xu, Shi Tong; Cheng, Jie Rong; Chen, Xiang Fan; Xiao, Lin; Chang, Sheng Jiang.

In: AIP Advances, Vol. 9, No. 7, 075017, 01.07.2019.

Research output: Contribution to journalArticle

Yu, Jian Ping ; Chen, Sai ; Fan, Fei ; Xu, Shi Tong ; Cheng, Jie Rong ; Chen, Xiang Fan ; Xiao, Lin ; Chang, Sheng Jiang. / Accelerating terahertz all-optical modulation by hot carriers effects of silver nanorods in PVA film. In: AIP Advances. 2019 ; Vol. 9, No. 7.
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