Optical Controlled Terahertz Modulator Based on Tungsten Disulfide Nanosheet

Scientific Reports
Zhiyuan FanHongda Chen

Abstract

The terahertz (THz) modulator, which will be applied in next-generation wireless communication, is a key device in a THz communication system. Current THz modulators based on traditional semiconductors and metamaterials have limited modulation depth or modulation range. Therefore, a THz modulator based on annealed tungsten disulfide (WS2, p-type) and high-resistivity silicon (n-type) is demonstrated. Pumped by a laser, the modulator presents a laser power-dependent modulation effect. Ranging from 0.25 to 2 THz, the modulation depth reaches 99% when the pumping laser is 2.59 W/cm2. The modulator works because the p-n heterojunction can separate and limit carriers to change the conductivity of the device, which results in a modulation of the THz wave. The wide band gap of WS2 can promote the separation and limitation of carriers to obtain a larger modulation depth, which provides a new direction for choosing new materials and new structures to fabricate a better THz modulator.

References

Dec 1, 2006·Nature·Hou-Tong ChenRichard D Averitt
Apr 29, 2009·Optics Express·Rafal WilkMartin Koch
Sep 6, 2011·Nature Nanotechnology·Long JuFeng Wang
Dec 1, 2012·Nano Letters·Humberto R GutiérrezMauricio Terrones
Sep 4, 2013·Nanoscale·Weijie ZhaoGoki Eda
May 12, 2015·Nature Communications·Quan LiWeili Zhang
Feb 10, 2016·Nanoscale·Sai ChenShengjiang Chang
Mar 10, 2016·Scientific Reports·Yapeng CaoHongda Chen
Oct 19, 2016·Scientific Reports·Kathleen M McCrearyBerend T Jonker

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Citations

Sep 25, 2019·Research : a Science Partner Journal·Z T MaH D Chen

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