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Title: Black Phosphorus Carbide as a Tunable Anisotropic Plasmonic Metasurface
Authors: Huang, Xin 
Cai, Yongqing 
Feng, Xuewei 
Tan, Wee Chong 
Hasan, Dihan Md. Nuruddin 
Chen, Li 
Chen, Nan 
Wang, Lin 
Huang, Li 
Duffin, Thorin Jake 
Nijhuis, Christian A. 
Zhang, Yong-Wei 
Lee, Chengkuo 
Ang, Kah-Wee 
Keywords: Anisotropic dispersion
Black phosphorus carbide
Fano resonance
Hybrid plasmon mode
Nanoribbon arrays
Issue Date: 18-May-2018
Publisher: American Chemical Society
Citation: Huang, Xin, Cai, Yongqing, Feng, Xuewei, Tan, Wee Chong, Hasan, Dihan Md. Nuruddin, Chen, Li, Chen, Nan, Wang, Lin, Huang, Li, Duffin, Thorin Jake, Nijhuis, Christian A., Zhang, Yong-Wei, Lee, Chengkuo, Ang, Kah-Wee (2018-05-18). Black Phosphorus Carbide as a Tunable Anisotropic Plasmonic Metasurface. ACS PHOTONICS 5 (8) : 3116 - 3123. ScholarBank@NUS Repository.
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. © 2018 American Chemical Society.
ISSN: 23304022
Appears in Collections:Staff Publications

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