IDEAS home Printed from https://ideas.repec.org/a/nat/natcom/v6y2015i1d10.1038_ncomms9814.html
   My bibliography  Save this article

Ultra-high modulation depth exceeding 2,400% in optically controlled topological surface plasmons

Author

Listed:
  • Sangwan Sim

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Houk Jang

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Nikesh Koirala

    (Rutgers, The State University of New Jersey)

  • Matthew Brahlek

    (Rutgers, The State University of New Jersey)

  • Jisoo Moon

    (Rutgers, The State University of New Jersey)

  • Ji Ho Sung

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Jun Park

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Soonyoung Cha

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Seongshik Oh

    (Rutgers, The State University of New Jersey
    Institute for Advanced Materials, Devices and Nanotechnology, Rutgers, The State University of New Jersey)

  • Moon-Ho Jo

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Jong-Hyun Ahn

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Hyunyong Choi

    (School of Electrical and Electronic Engineering, Yonsei University)

Abstract

Modulating light via coherent charge oscillations in solids is the subject of intense research topics in opto-plasmonics. Although a variety of methods are proposed to increase such modulation efficiency, one central challenge is to achieve a high modulation depth (defined by a ratio of extinction with/without light) under small photon-flux injection, which becomes a fundamental trade-off issue both in metals and semiconductors. Here, by fabricating simple micro-ribbon arrays of topological insulator Bi2Se3, we report an unprecedentedly large modulation depth of 2,400% at 1.5 THz with very low optical fluence of 45 μJ cm−2. This was possible, first because the extinction spectrum is nearly zero due to the Fano-like plasmon–phonon-destructive interference, thereby contributing an extremely small denominator to the extinction ratio. Second, the numerator of the extinction ratio is markedly increased due to the photoinduced formation of massive two-dimensional electron gas below the topological surface states, which is another contributor to the ultra-high modulation depth.

Suggested Citation

  • Sangwan Sim & Houk Jang & Nikesh Koirala & Matthew Brahlek & Jisoo Moon & Ji Ho Sung & Jun Park & Soonyoung Cha & Seongshik Oh & Moon-Ho Jo & Jong-Hyun Ahn & Hyunyong Choi, 2015. "Ultra-high modulation depth exceeding 2,400% in optically controlled topological surface plasmons," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9814
    DOI: 10.1038/ncomms9814
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/ncomms9814
    File Function: Abstract
    Download Restriction: no
    File URL: https://libkey.io/10.1038/ncomms9814?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9814. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.