Midinfrared Electro-optic Modulation in Few-Layer Black Phosphorus

Ruoming Peng, Kaveh Khaliji, Nathan Youngblood, Roberto Grassi, Tony Low, Mo Li

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Black phosphorus stands out from the family of two-dimensional materials as a semiconductor with a direct, layer-dependent bandgap spanning the visible to mid-infrared (mid-IR) spectral range. It is, therefore, a very promising material for various optoelectronic applications, particularly in the important mid-IR range. While mid-IR technology has been advancing rapidly, both photodetection and electro-optic modulation in the mid-IR rely on narrow-band compound semiconductors, which are difficult and expensive to integrate with the ubiquitous silicon photonics. For mid-IR photodetection, black phosphorus has already been proven to be a viable alternative. Here, we demonstrate electro-optic modulation of mid-IR absorption in few-layer black phosphorus. Our experimental and theoretical results find that, within the doping range obtainable in our samples, the quantum confined Franz-Keldysh effect is the dominant mechanism of electro-optic modulation. A spectroscopic study on samples with varying thicknesses reveals strong layer dependence in the interband transition between specific pairs of sub-bands. Our results show that black phosphorus is a very promising material to realizing efficient mid-IR modulators.

Original languageEnglish (US)
Pages (from-to)6315-6320
Number of pages6
JournalNano letters
Volume17
Issue number10
DOIs
StatePublished - Oct 11 2017

Fingerprint

Electrooptical effects
Phosphorus
electro-optics
phosphorus
Modulation
Infrared radiation
modulation
Semiconductor materials
infrared absorption
narrowband
modulators
Infrared absorption
photonics
Silicon
Optoelectronic devices
Photonics
Modulators
Energy gap
silicon
Doping (additives)

Keywords

  • Black phosphorus
  • electro-absorptive modulation
  • electro-optic modulation
  • midinfrared
  • quantum confined Franz-Keldysh effect
  • transmission extinction measurement

How much support was provided by MRSEC?

  • Partial

Reporting period for MRSEC

  • Period 4

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.

Cite this

Peng, R., Khaliji, K., Youngblood, N., Grassi, R., Low, T., & Li, M. (2017). Midinfrared Electro-optic Modulation in Few-Layer Black Phosphorus. Nano letters, 17(10), 6315-6320. https://doi.org/10.1021/acs.nanolett.7b03050

Midinfrared Electro-optic Modulation in Few-Layer Black Phosphorus. / Peng, Ruoming; Khaliji, Kaveh; Youngblood, Nathan; Grassi, Roberto; Low, Tony; Li, Mo.

In: Nano letters, Vol. 17, No. 10, 11.10.2017, p. 6315-6320.

Research output: Contribution to journalArticle

Peng, R, Khaliji, K, Youngblood, N, Grassi, R, Low, T & Li, M 2017, 'Midinfrared Electro-optic Modulation in Few-Layer Black Phosphorus', Nano letters, vol. 17, no. 10, pp. 6315-6320. https://doi.org/10.1021/acs.nanolett.7b03050
Peng, Ruoming ; Khaliji, Kaveh ; Youngblood, Nathan ; Grassi, Roberto ; Low, Tony ; Li, Mo. / Midinfrared Electro-optic Modulation in Few-Layer Black Phosphorus. In: Nano letters. 2017 ; Vol. 17, No. 10. pp. 6315-6320.
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