Study of black phosphorus anisotropy on silicon photonic waveguide

Che Chen, Nathan Youngblood, Mo Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


Due to its unique crystal structure, black phosphorus (BP) shows anisotropic electric and optical properties. In this work, we demonstrate its optical anisotropy by measuring its different absorptions of TE and TM modes travelling in silicon photonic waveguides. In the experiment, when BP crystal armchair axis is aligned perpendicularly to waveguide, the measured absorption coefficients for TE and TM are 0.821 dB/μm and 0.413 dB/μm, respectively. The result matches well with our calculated absorptions of 1.075 dB/μm and 0.581 dB/μm for TE and TM modes. By carefully selecting BP thickness and orientation, it is possible to selectively absorb either TE or TM mode and as an example, TE/TM contrast can reach up to 1.1 dB/μm when BP thickness is 100 nm.

Original languageEnglish (US)
Title of host publication2015 Optoelectronics Global Conference, OGC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467377324
StatePublished - Nov 24 2015
EventOptoelectronics Global Conference, OGC 2015 - Shenzhen, China
Duration: Aug 29 2015Aug 31 2015


OtherOptoelectronics Global Conference, OGC 2015


  • black phosphorus
  • optical anisotropic absorption
  • silicon waveguide
  • two dimensional materials


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