Selective multi-wavelength infrared emission by stacked gap-plasmon thermal emitters

Hui Hsin Hsiao, Bo Ting Xu

Research output: Contribution to journalArticlepeer-review

Abstract

Selective multi-wavelength infrared light sources are important elements to achieve precise molecular detection by the usage of their intrinsic vibrational spectra. In this work, we proposed a double-stacked cross-shaped metal-dielectric-metal (MDM) resonator to achieve pentawavelength mid-infrared thermal emission. Through the optimization of un-symmetric crossshaped tri-layers incorporated with two sandwiched dielectric materials, four distinct emission bands associated with the magnetic resonances in stacked MDM resonators were realized, which shows nondispersive and polarization-dependent property due to the localized plasmon oscillations of the magnetic resonances. In addition, the phonon emission in the silicon dioxide layer also contributes one radiation peak at λ = 10 μm. Via a simple polarization rotator, the emission wavelengths can be tuned from 4.5 and 7.5 μm to 5.5 and 8.5 μm. This paves the way for simultaneous detection of multi-band molecular absorption fingerprint, and the polarizationtunable emission wavelengths also facilitate the possibility to achieve multi-compound sensing via one compact system.

Original languageEnglish
Article number165201
JournalNanotechnology
Volume32
Issue number16
DOIs
Publication statusPublished - 2021 Apr 16

Keywords

  • Gap-plasmon metasurfaces
  • Mid-infrared
  • Multi-wavelength
  • Thermal emitters

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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