Direct Investigation of the Birefringent Optical Properties of Black Phosphorus with Picosecond Interferometry

Wei Zheng, Andrei Nemilentsau, Dustin Lattery, Peipei Wang, Tony Low, Jie Zhu, Xiaojia Wang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Black phosphorus (BP) is an emerging 2D semiconducting material with great potential for nanoelectronic and nanophotonic applications, especially owing to its unique anisotropic electrical and optical properties. Many theoretical studies have predicted the anisotropic optical properties of BP, but the direct experimental quantification remains challenging. The difficulties stem from the ease of BP's degradation when exposed to air in ambient conditions, and from the indirect nature of conventional approaches that are subject to large measurement uncertainties. This work reports a direct investigation of the birefringent optical constants of micrometer-thick BP samples with picosecond (ps) interferometry, over the wavelength range from 780 to 890 nm. In this ps-interferometry approach, an ultrathin (5 nm) platinum layer for launching acoustic waves naturally protects the BP flake from degradation. The birefringent optical constants of BP for light polarization along the two primary crystalline orientations, zigzag and armchair, are directly obtained via fitting the attenuated Brillouin scattering signals. A biexponential model is further proposed to analyze the Brillouin scattering signals for a random incident light polarization. The BP experimental results and the associated measurement sensitivity analysis demonstrate the reliability and accuracy of the ps-interferometry approach for capturing the polarization-dependent optical properties of birefringent materials.

Original languageEnglish (US)
Article number1700831
JournalAdvanced Optical Materials
Volume6
Issue number1
DOIs
StatePublished - Jan 4 2018

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Interferometry
Phosphorus
phosphorus
interferometry
Optical properties
optical properties
Brillouin scattering
Optical constants
Light polarization
polarization
degradation
Nanophotonics
Degradation
Nanoelectronics
launching
flakes
Launching
sensitivity analysis
Platinum
scattering

Keywords

  • Anisotropic optical absorption
  • Birefringent optical constants
  • Black phosphorus
  • Brillouin scattering
  • Picosecond interferometry

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 4

Cite this

Direct Investigation of the Birefringent Optical Properties of Black Phosphorus with Picosecond Interferometry. / Zheng, Wei; Nemilentsau, Andrei; Lattery, Dustin; Wang, Peipei; Low, Tony; Zhu, Jie; Wang, Xiaojia.

In: Advanced Optical Materials, Vol. 6, No. 1, 1700831, 04.01.2018.

Research output: Contribution to journalArticle

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