Infrared frequency-tunable coherent thermal sources

Hao Wang, Yue Yang, Liping Wang

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

In this work, we numerically demonstrate an infrared (IR) frequency-tunable selective thermal emitter made of graphene-covered silicon carbide (SiC) gratings. Rigorous coupled-wave analysis shows temporally-coherent emission peaks associated with magnetic polariton (MP), whose resonance frequency can be dynamically tuned within the phonon absorption band of SiC by varying graphene chemical potential. An analytical inductor-capacitor circuit model is introduced to quantitatively predict the resonance frequency and further elucidate the mechanism for the tunable emission peak. The effects of grating geometric parameters, such as grating height, groove width and grating period, on the selective emission peak are explored. The direction-independent behavior of MP and associated coherent emission are also demonstrated. Moreover, by depositing four layers of graphene sheets onto the SiC gratings, a large tunability of 8.5% in peak frequency can be obtained to yield the coherent emission covering a broad frequency range from 820 to 890 cm-1. The novel tunable metamaterial could pave the way to a new class of tunable thermal sources in the IR region.

Original languageEnglish (US)
Article number045104
JournalJournal of Optics (United Kingdom)
Volume17
Issue number4
DOIs
StatePublished - Apr 1 2015

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Keywords

  • coherent emission
  • grapheme
  • thermal source
  • tunable metamaterials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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