Jump to main content
Jump to site search

Issue 9, 2020, Issue in Progress
Previous Article Next Article

Near-field imaging of the multi-resonant mode induced broadband tunable metamaterial absorber

Author affiliations

Abstract

Metamaterial absorbers with tunability have broad prospects for mid-infrared absorption applications. While various methods have been proposed to control absorption, how to analyse and present the physical image of absorption mechanism in depth is still expected and meaningful. Here, we present experimental spatial near-field distributions of a multi-resonant mode induced broadband tunable metamaterial absorber by using near-field optical microscopy. The absorber is constructed by a metal double-sized unit cell and a metallic mirror separated by a thin Ge2Sb2Te5 (GST) spacer. To clearly obtain the physical images, we used a hybrid unit cell consisting of four square resonators to produce two absorption peaks at 7.8 μm and 8.3 μm. The resonance central-wavelength exhibits a redshift while switching the GST thin film from amorphous to crystalline phase. The near-field amplitude and phase optical responses of the absorber are directly observed at absorption frequencies when GST is in both phases, respectively. This work will pave the way for the fundamental science field and inspire potential applications in optical tunable absorption control.

Graphical abstract: Near-field imaging of the multi-resonant mode induced broadband tunable metamaterial absorber

Back to tab navigation

Article information


Submitted
06 Dec 2019
Accepted
28 Dec 2019
First published
31 Jan 2020

This article is Open Access

RSC Adv., 2020,10, 5146-5151
Article type
Paper

Near-field imaging of the multi-resonant mode induced broadband tunable metamaterial absorber

L. Chen, L. Sun, H. Dong, N. Mou, Y. Zhang, Q. Li, X. Jiang and L. Zhang, RSC Adv., 2020, 10, 5146
DOI: 10.1039/C9RA10233G

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements