Black Phosphorus Carbide as a Tunable Anisotropic Plasmonic Metasurface

Xin Huang, Yongqing Cai, Xuewei Feng, Wee Chong Tan, Dihan Md. Nuruddin Hasan, Li Chen, Nan Chen, Lin Wang, Li Huang, Thorin Jake Duffin, Christian A. Nijhuis, Yong-Wei Zhang, Chengkuo Lee, Kah-Wee Ang*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

Tailoring photonics for monolithic integration beyond the diffraction limit opens a new era of nanoscale electronic-photonic systems, including graphene plasmonics which exhibits low level of losses and high degree of spatial confinement. Limited to its isotropic optical conductivity, searching for new plasmonic building blocks which offer tunability and design flexibility beyond graphene is becoming quite crucial for next-generation optoelectronic device. Here, motivated by the recent emergence of a new 2D material, we develop a mid-infrared (mid-IR) metasurface by nanostructuring a thin layer of black phosphorus carbide (b-PC) and realize efficient excitation of hybrid plasmon mode at deep subwavelength-scale. Far-field infrared spectroscopy demonstrates that the hybrid plasmon mode displays an anticrossing behavior of two splitting optical modes, which can be attributed to the Fano resonance between plasmons and IR-active optical phonons in b-PC. Significantly, it further presents a strong anisotropic behavior along different crystal orientations, which arises from its peculiar puckered lattice structure with two clearly distinguishable axes. The results illustrate that anisotropic b-PC plasmon not only represents an important advance in subwavelength optoelectronics, but also provides a viable platform for hyperbolic metamaterials, bringing widespread applications into biosensors, single-photon source, nanoantenna, and subwavelength resolution imaging.
Original languageEnglish
Pages (from-to)3116-3123
JournalACS photonics
Volume5
Issue number8
DOIs
Publication statusPublished - Aug 2018
Externally publishedYes

Keywords

  • hybrid plasmon mode
  • anisotropic dispersion
  • black phosphorus carbide
  • nanoribbon arrays
  • Fano resonance

Cite this