Ultrafast Optomechanical Terahertz Modulators Based on Stretchable Carbon Nanotube Thin Films  

作　　者：Maksim I.Paukov Vladimir V.Starchenko Dmitry V.Krasnikov Gennady A.Komandin Yuriy G.Gladush Sergey S.Zhukov Boris P.Gorshunov Albert G.Nasibulin Aleksey V.Arsenin Valentyn S.Volkov Maria G.Burdanova 

机构地区：[1]Center for Photonics and 2D Materials,Moscow Institute of Physics and Technology,Dolgoprudny.Russia [2]Skolkovo Institute of Science and Technology,Moscow,Russia [3]Prokhorov General Physics Institute of the Russian Academy of Sciences,Moscow,Russia [4]Laboratory of Advanced Functional Materials,Yerevan State University,Yerevan,Armenia [5]Institute of Solid State Physics of the Russian Academy of Sciences,Chernogolovka,Russia.

出　　处：《Ultrafast Science》2023年第6期1-9,共9页超快科学（英文）

基　　金：M.G.B.and M.I.P.acknowledge Russian Science Foundation(RSF)project no.21-79-10097(experimental OPTP measurements);Ministry of Science and Higher Education of the Russian Federation no.0714-2020-0002(anisotropy factor measurements for SWCNT films);Moreover,M.G.B.acknowledges RSF project no.22-72-10033(investigation of the stretchable modulators efficiency);B.P.G.and A.G.N.acknowledge RSF project no.21-72-20050(sample preparation).

摘　　要：For terahertz wave applications,tunable and rapid modulation is highly required.When studied by means of optical pump-terahertz probe spectroscopy,single-walled carbon nanotube(SWCNT)thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation,making them promising candidates for high-speed modulators.Here,combination of SWCNT thin films and stretchable substrates facilitated studies of the SWCNT mechanical properties under strain and enabled the development of a new type of an optomechanical modulator.By applying a certain strain to the SWCNT films,the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed modulator.Modulators exhibited a photoconductivity change of approximately 2 times of magnitude under the strain because of the structural modification in the SWCNT network.Stretching was used to control the terahertz signal with a modulation depth of around 100%without strain and 65%at a high strain operation of 40%.The sensitivity of modulators to beam polarization is also shown,which might also come in handy for the design of a stretchable polarizer.Our results give a fundamental grounding for the design of high-sensitivity stretchable devices based on SWCNT films.

关 键 词：STRAIN EXCITATION films 

分 类 号：TB383[一般工业技术—材料科学与工程] O441[理学—电磁学]