title: Coherent Generation of Photo-Thermo-Acoustic Wave from Graphene Sheets.
abstract: Many remarkable properties of graphene are derived from its large energy window for Dirac-like electronic states and have been explored for applications in electronics and photonics. In addition, strong electron-phonon interaction in graphene has led to efficient photo-thermo energy conversions, which has been harnessed for energy applications. By combining the wavelength independent absorption property and the efficient photo-thermo energy conversion, here we report a new type of applications in sound wave generation underlined by a photo-thermo-acoustic energy conversion mechanism. Most significantly, by utilizing ultrafast optical pulses, we demonstrate the ability to control the phase of sound waves generated by the photo-thermal-acoustic process. Our finding paves the way for new types of applications for graphene, such as remote non-contact speakers, optical-switching acoustic devices, etc.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yichao
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: L L
authors.initials: LL
authors.lastname: Zhu
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: L Q
authors.initials: LQ
authors.lastname: Tao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Shu
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: D
authors.initials: D
authors.lastname: Xie
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Wei
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: X H
authors.initials: XH
authors.lastname: Lu
authors.affiliation: Institute of Microelectronics &Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Tian-Ling
authors.initials: TL
authors.lastname: Ren
authors.affiliation: Department of Physics, Texas University at Austin, Texas 78712, USA.
authors.forename: Chih-Kang
authors.initials: CK
authors.lastname: Shih
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Jimin
authors.initials: J
authors.lastname: Zhao