Issue 46, 2015

Broadly tunable graphene plasmons using an ion-gel top gate with low control voltage

Abstract

The electrostatic tunability of graphene is vital in the field of active plasmons and would be beneficial in tunable infrared and terahertz optical element applications. The key to realizing broad tunability is achieving high carrier densities in graphene. Here we use an ion-gel, currently one of the most efficient dielectrics with ultra-high capacitance, to realize broadly tunable graphene plasmons (∼1270 cm−1) with low voltage modulation (∼4 V shifted from the Dirac point). We further explore the coupling between graphene plasmons and the molecular vibration modes of the ion-gel, since strong plasmon–phonon coupling can split the plasmon resonance peak into multi-peaks and reduce their tunability. Our experiments demonstrate weak plasmon–phonon coupling in the graphene/ion-gel system, which has limited effects on plasmon properties. These properties make ion-gels an effective dielectric for broadly tunable graphene plasmonic devices, such as new optical modulators, filters and wavelength multiplexers.

Graphical abstract: Broadly tunable graphene plasmons using an ion-gel top gate with low control voltage

Supplementary files

Article information

Article type
Paper
Submitted
01 Aug. 2015
Accepted
28 Sept. 2015
First published
07 Okt. 2015

Nanoscale, 2015,7, 19493-19500

Broadly tunable graphene plasmons using an ion-gel top gate with low control voltage

H. Hu, F. Zhai, D. Hu, Z. Li, B. Bai, X. Yang and Q. Dai, Nanoscale, 2015, 7, 19493 DOI: 10.1039/C5NR05175D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements