Abstract-Optically tuned terahertz modulator based on annealed multilayer MoS2

• Yapeng Cao
• , Sheng Gan
• , Zhaoxin Geng
• , Jian Liu
• , Yuping Yang
• , Qiaoling Bao
•  & Hongda Chen

• Scientific Reports 6, Article number: 22899 
• http://www.nature.com/articles/srep22899

Controlling the propagation properties of terahertz waves is very important in terahertz technologies applied in high-speed communication. Therefore a new-type optically tuned terahertz modulator based on multilayer-MoS2 and silicon is experimentally demonstrated. The terahertz transmission could be significantly modulated by changing the power of the pumping laser. With an annealing treatment as a p-doping method, MoS2 on silicon demonstrates a triple enhancement of terahertz modulation depth compared with the bare silicon. This MoS2-based device even exhibited much higher modulation efficiency than the graphene-based device. We also analyzed the mechanism of the modulation enhancement originated from annealed MoS2, and found that it is different from that of graphene-based device. The unique optical modulating properties of the device exhibit tremendous promise for applications in terahertz switch.