Anisotropic Acoustic Plasmons in Black Phosphorus

In Ho Lee, Luis Martin-Moreno, Daniel A. Mohr, Kaveh Khaliji, Tony Low, Sang Hyun Oh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Acoustic plasmon modes tightly coupled between a two-dimensional material and another conducting layer can exhibit optical confinement not possible with conventional plasmons. Here, we investigate acoustic plasmons supported in a monolayer and multilayers of black phosphorus (BP) placed shortly above a conducting plate. In the presence of a conducting plate, the acoustic plasmon dispersion for the armchair direction is found to exhibit the characteristic linear scaling in the mid- and far-infrared regime while it largely deviates from that in the long-wavelength limit and near-infrared regime. For the zigzag direction, such scaling behavior is not evident due to relatively tighter plasmon confinement. Further, we demonstrate a novel design for an acoustic plasmon resonator that exhibits higher plasmon confinement and resonance efficiency than BP ribbon resonators in the mid-infrared and longer wavelength regime. The theoretical framework and new resonator designs studied here provide a practical route toward the experimental verification of acoustic plasmons in BP and open up the possibility to develop novel plasmonic and optoelectronic devices that can leverage its strong in-plane anisotropy and thickness-dependent band gap.

Original languageEnglish (US)
Pages (from-to)2208-2216
Number of pages9
JournalACS Photonics
Volume5
Issue number6
DOIs
StatePublished - Jun 2018

Fingerprint

Plasmons
plasmons
Acoustics
Phosphorus
phosphorus
acoustics
Resonators
resonators
Infrared radiation
conduction
scaling
Wavelength
Anisotropy
optoelectronic devices
wavelengths
Optoelectronic devices
coupled modes
ribbons
Monolayers
Multilayers

Keywords

  • acoustic plasmon
  • anisotropy
  • black phosphorus
  • gap plasmon
  • surface plasmon polaritons
  • two-dimensional material

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 4

Cite this

Anisotropic Acoustic Plasmons in Black Phosphorus. / Lee, In Ho; Martin-Moreno, Luis; Mohr, Daniel A.; Khaliji, Kaveh; Low, Tony; Oh, Sang Hyun.

In: ACS Photonics, Vol. 5, No. 6, 06.2018, p. 2208-2216.

Research output: Contribution to journalArticle

Lee, In Ho ; Martin-Moreno, Luis ; Mohr, Daniel A. ; Khaliji, Kaveh ; Low, Tony ; Oh, Sang Hyun. / Anisotropic Acoustic Plasmons in Black Phosphorus. In: ACS Photonics. 2018 ; Vol. 5, No. 6. pp. 2208-2216.
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