Infrared nanoimaging reveals the surface metallic plasmons in topological insulator

Jian Yuan, Weiliang Ma, Lei Zhang, Yao Lu, Meng Zhao, Hongli Guo, Jin Zhao, Wenzhi Yu, Yupeng Zhang, Kai Zhang, Hui Ying Hoh, Xiaofeng Li, Kian Ping Loh, Shaojuan Li, Cheng Wei Qiu, Qiaoliang Bao

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

Surface plasmons make a high degree of localization of electromagnetic fields achievable at the vicinity of metal surfaces. Topological insulators (TIs) are a family of materials which are insulating in the bulk but have metallic surfaces caused by the strong spin-orbit coupling. Surface plasmons supported by the surface state on topological insulators have attracted incredible interests from ultraviolet to mid-infrared frequencies. In this work, we experimentally investigate the near-field properties of Bi2Te3 nanosheets using scattering-type scanning near-field optical microscopy (s-SNOM). The s-SNOM tip enables to detect significantly enhanced intensity in its near field at precisely controlled positions with regards to Bi2Te3 structure. With the help of highly position-selective excitation and high-pixel real-space mapping, we discover near-field patterns of bright outside fringes which are associated with its surface-metallic, plasmonic behavior at mid-infrared frequency. Thereby, we experimentally demonstrate that the scattered signal responses and near-field amplitudes of outside fringes can be tailored via mechanical (sheet thickness of Bi2Te3), electric (electrostatic gating), and optical (incident wavelength) fashions. The discovery of outside fringes in TI nanosheets may enable the development of strongly enhanced light-matter interactions for quantum optical devices, mid-infrared (MIR) and terahertz detectors or sensors.

Original languageEnglish
Pages (from-to)3055-3062
Number of pages8
JournalACS Photonics
Volume4
Issue number12
DOIs
Publication statusPublished - 20 Dec 2017

Keywords

  • bismuth telluride
  • infrared nanoscopy
  • near-field optical microscopy
  • surface plasmon

Cite this

Yuan, Jian ; Ma, Weiliang ; Zhang, Lei ; Lu, Yao ; Zhao, Meng ; Guo, Hongli ; Zhao, Jin ; Yu, Wenzhi ; Zhang, Yupeng ; Zhang, Kai ; Hoh, Hui Ying ; Li, Xiaofeng ; Loh, Kian Ping ; Li, Shaojuan ; Qiu, Cheng Wei ; Bao, Qiaoliang. / Infrared nanoimaging reveals the surface metallic plasmons in topological insulator. In: ACS Photonics. 2017 ; Vol. 4, No. 12. pp. 3055-3062.
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abstract = "Surface plasmons make a high degree of localization of electromagnetic fields achievable at the vicinity of metal surfaces. Topological insulators (TIs) are a family of materials which are insulating in the bulk but have metallic surfaces caused by the strong spin-orbit coupling. Surface plasmons supported by the surface state on topological insulators have attracted incredible interests from ultraviolet to mid-infrared frequencies. In this work, we experimentally investigate the near-field properties of Bi2Te3 nanosheets using scattering-type scanning near-field optical microscopy (s-SNOM). The s-SNOM tip enables to detect significantly enhanced intensity in its near field at precisely controlled positions with regards to Bi2Te3 structure. With the help of highly position-selective excitation and high-pixel real-space mapping, we discover near-field patterns of bright outside fringes which are associated with its surface-metallic, plasmonic behavior at mid-infrared frequency. Thereby, we experimentally demonstrate that the scattered signal responses and near-field amplitudes of outside fringes can be tailored via mechanical (sheet thickness of Bi2Te3), electric (electrostatic gating), and optical (incident wavelength) fashions. The discovery of outside fringes in TI nanosheets may enable the development of strongly enhanced light-matter interactions for quantum optical devices, mid-infrared (MIR) and terahertz detectors or sensors.",
keywords = "bismuth telluride, infrared nanoscopy, near-field optical microscopy, surface plasmon",
author = "Jian Yuan and Weiliang Ma and Lei Zhang and Yao Lu and Meng Zhao and Hongli Guo and Jin Zhao and Wenzhi Yu and Yupeng Zhang and Kai Zhang and Hoh, {Hui Ying} and Xiaofeng Li and Loh, {Kian Ping} and Shaojuan Li and Qiu, {Cheng Wei} and Qiaoliang Bao",
year = "2017",
month = "12",
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doi = "10.1021/acsphotonics.7b00568",
language = "English",
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Yuan, J, Ma, W, Zhang, L, Lu, Y, Zhao, M, Guo, H, Zhao, J, Yu, W, Zhang, Y, Zhang, K, Hoh, HY, Li, X, Loh, KP, Li, S, Qiu, CW & Bao, Q 2017, 'Infrared nanoimaging reveals the surface metallic plasmons in topological insulator', ACS Photonics, vol. 4, no. 12, pp. 3055-3062. https://doi.org/10.1021/acsphotonics.7b00568

Infrared nanoimaging reveals the surface metallic plasmons in topological insulator. / Yuan, Jian; Ma, Weiliang; Zhang, Lei; Lu, Yao; Zhao, Meng; Guo, Hongli; Zhao, Jin; Yu, Wenzhi; Zhang, Yupeng; Zhang, Kai; Hoh, Hui Ying; Li, Xiaofeng; Loh, Kian Ping; Li, Shaojuan; Qiu, Cheng Wei; Bao, Qiaoliang.

In: ACS Photonics, Vol. 4, No. 12, 20.12.2017, p. 3055-3062.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Yuan, Jian

AU - Ma, Weiliang

AU - Zhang, Lei

AU - Lu, Yao

AU - Zhao, Meng

AU - Guo, Hongli

AU - Zhao, Jin

AU - Yu, Wenzhi

AU - Zhang, Yupeng

AU - Zhang, Kai

AU - Hoh, Hui Ying

AU - Li, Xiaofeng

AU - Loh, Kian Ping

AU - Li, Shaojuan

AU - Qiu, Cheng Wei

AU - Bao, Qiaoliang

PY - 2017/12/20

Y1 - 2017/12/20

N2 - Surface plasmons make a high degree of localization of electromagnetic fields achievable at the vicinity of metal surfaces. Topological insulators (TIs) are a family of materials which are insulating in the bulk but have metallic surfaces caused by the strong spin-orbit coupling. Surface plasmons supported by the surface state on topological insulators have attracted incredible interests from ultraviolet to mid-infrared frequencies. In this work, we experimentally investigate the near-field properties of Bi2Te3 nanosheets using scattering-type scanning near-field optical microscopy (s-SNOM). The s-SNOM tip enables to detect significantly enhanced intensity in its near field at precisely controlled positions with regards to Bi2Te3 structure. With the help of highly position-selective excitation and high-pixel real-space mapping, we discover near-field patterns of bright outside fringes which are associated with its surface-metallic, plasmonic behavior at mid-infrared frequency. Thereby, we experimentally demonstrate that the scattered signal responses and near-field amplitudes of outside fringes can be tailored via mechanical (sheet thickness of Bi2Te3), electric (electrostatic gating), and optical (incident wavelength) fashions. The discovery of outside fringes in TI nanosheets may enable the development of strongly enhanced light-matter interactions for quantum optical devices, mid-infrared (MIR) and terahertz detectors or sensors.

AB - Surface plasmons make a high degree of localization of electromagnetic fields achievable at the vicinity of metal surfaces. Topological insulators (TIs) are a family of materials which are insulating in the bulk but have metallic surfaces caused by the strong spin-orbit coupling. Surface plasmons supported by the surface state on topological insulators have attracted incredible interests from ultraviolet to mid-infrared frequencies. In this work, we experimentally investigate the near-field properties of Bi2Te3 nanosheets using scattering-type scanning near-field optical microscopy (s-SNOM). The s-SNOM tip enables to detect significantly enhanced intensity in its near field at precisely controlled positions with regards to Bi2Te3 structure. With the help of highly position-selective excitation and high-pixel real-space mapping, we discover near-field patterns of bright outside fringes which are associated with its surface-metallic, plasmonic behavior at mid-infrared frequency. Thereby, we experimentally demonstrate that the scattered signal responses and near-field amplitudes of outside fringes can be tailored via mechanical (sheet thickness of Bi2Te3), electric (electrostatic gating), and optical (incident wavelength) fashions. The discovery of outside fringes in TI nanosheets may enable the development of strongly enhanced light-matter interactions for quantum optical devices, mid-infrared (MIR) and terahertz detectors or sensors.

KW - bismuth telluride

KW - infrared nanoscopy

KW - near-field optical microscopy

KW - surface plasmon

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