Affiliation of Author(s):[1]Linkoping Univ, Dept Sci & Technol ITN, Lab Organ Elect, SE-60174 Norrkoping, Sweden;[2]Univ Elect Sci & Technol China, Sch Elect Sci & Engn, State Key Lab Elect Thin Film & Integrated Devices, Chengdu 610054, Sichuan, Peoples R China;[3]Linkoping Univ, Wallenberg Wood Sci Ctr, SE-60174 Norrkoping, Sweden;[4]Wuyi Univ, Sch Text Mat & Engn, 22 Dongchengcun, Jiangmen 529020, Guangdong, Peoples R China;[5]Linkoping Univ, Terahertz Mat Anal Ctr THeMAC, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden;[6]Linkoping Univ, Ctr N Technol 3, Dept Phys Chem & Biol IFM, C3NiT Janzen, SE-58183 Linkoping, Sweden;[7]Lund Univ, Solid State Phys & NanoLund, SE-22100 Lund, Sweden;[8]Univ Elect Sci & Technol China, Yangtze Delta Reg Inst Huzhou, Huzhou 313001, Zhejiang, Peoples R China;[9]Stellenbosch Univ, Wallenberg Res Ctr, Stellenbosch Inst Adv Study STIAS, ZA-7600 Stellenbosch, South Africa
Journal:ADVANCED SCIENCE
Key Words:conducting polymers; cellulose; terahertz; aerogels; redox tuning
Abstract:Terahertz (THz) technologies provide opportunities ranging from calibration targets for satellites and telescopes to communication devices and biomedical imaging systems. A main component will be broadband THz absorbers with switchability. However, optically switchable materials in THz are scarce and their modulation is mostly available at narrow bandwidths. Realizing materials with large and broadband modulation in absorption or transmission forms a critical challenge. This study demonstrates that conducting polymer-cellulose aerogels can provide modulation of broadband THz light with large modulation range from approximate to 13% to 91% absolute transmission, while maintaining specular reflection loss < -30 dB. The exceptional THz modulation is associated with the anomalous optical conductivity peak of conducting polymers, which enhances the absorption in its oxidized state. The study also demonstrates the possibility to reduce the surface hydrophilicity by simple chemical modifications, and shows that broadband absorption of the aerogels at optical frequencies enables de-frosting by solar-induced heating. These low-cost, aqueous solution-processable, sustainable, and bio-friendly aerogels may find use in next-generation intelligent THz devices.
Document Type:Article
Volume:11
Issue:3
ISSN No.:21983844
Translation or Not:no