Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays

Lai，Weien1; Zhu，Qing1; Liu，Gen1; Shi，Guanghua3; Gan，Yichen2; Amini，Abbas4; Cheng，Chun2

2022-12-15

10.1088/1361-6463/ac9ac5

JOURNAL OF PHYSICS D-APPLIED PHYSICS   Impact Factor & Quartile

0022-3727

1361-6463

Broadband and large-depth THz modulation are crucially important for building next-generation THz devices in THz communication systems. Here, we present a broadband and large-depth THz modulator based on silicon/self-assembled silver nanoparticle (SAM AgNP) arrays, which exhibits a broadband modulation within the frequency range of 0.2-2.0 THz and a large modulation depth of ∼91.2% under a moderate near-infrared (NIR) light intensity of 1.77 W cm. For a modulation mechanism, the plasmon-enhanced NIR light absorption of SAM AgNP arrays shows a key role in increasing the photoconductivity of the device under NIR light irradiation. The experimental results are verified well by the numerical simulation. The proposed device can significantly improve the overall performance of THz systems, and opens the opportunity for designing novel nanoparticle-based THz devices.

modulation depth photoconductivity self-assembly silver nanoparticles terahertz wave

SCI ; EI

English

Corresponding

WOS:000878381200001

20224613123702

Infrared devices ; Light absorption ; Metal nanoparticles ; Modulation ; Monolayers ; Photoconductivity ; Self assembly ; Terahertz waves

Electricity: Basic Concepts and Phenomena:701.1 ; Electromagnetic Waves:711 ; Light/Optics:741.1 ; Nanotechnology:761 ; Materials Science:951

PHYSICS

2-s2.0-85141838942

Scopus

1.National Engineering Laboratory of Special Display Technology,National Key Laboratory of Advanced Display Technology,Anhui Province Key Laboratory of Measuring Theory and Precision Instrument,Academy of Opto-Electronic Technology,HeFei University of Technology,HeFei,230009,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.The 13th Research Institute,CETC,Shijiazhuang,Luquan Economic Development Zone, Prosperous Street,050051,China
4.Center for Infrastructure Engineering,Western Sydney University,Kingswood,2751,Australia

Lai，Weien,Zhu，Qing,Liu，Gen,et al. Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2022,55(50).

Lai，Weien.,Zhu，Qing.,Liu，Gen.,Shi，Guanghua.,Gan，Yichen.,...&Cheng，Chun.(2022).Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays.JOURNAL OF PHYSICS D-APPLIED PHYSICS,55(50).

Lai，Weien,et al."Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays".JOURNAL OF PHYSICS D-APPLIED PHYSICS 55.50(2022).