Anisotropic Van der Waals 2D GeAs Integrated on Silicon Four-Waveguide Crossing

Ghada Dushaq, Juan Esteban Villegas, Bruna Paredes, Srinivasa Reddy Tamalampudi, Mahmoud S. Rasras

Research output: Contribution to journalArticlepeer-review


In-plane optical anisotropy plays a critical role in manipulating light in a wide range of planner photonic devices. In this study, the strong anisotropy of multilayer 2D GeAs is leveraged and utilized to validate the technical feasibility of on-chip light management. A 2D GeAs is stamped into an ultra-compact silicon waveguide four-way crossing optimized for operation in the O-optical band. The measured optical transmission spectra indicated a remarkable discrepancy between the in-plane crystal optical axes with an attenuation ratio of &#x223C; 3.5 (at 1330 nm). Additionally, the effect of GeAs crystal orientation on the electro-optic transmission performance is demonstrated on a straight waveguide. A notable 50 &#x0025; reduction in responsivity was recorded for devices constructed with cross direction compared to devices with a crystal <italic>a</italic>-direction parallel to the light polarization. This extraordinary optical anisotropy, combined with a high refractive index &#x223C; 4 of 2D GeAs, opens possibilities for efficient on-chip light manipulation in photonic devices.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalJournal of Lightwave Technology
Issue number6
StateAccepted/In press - 2022


  • Anisotropic Van der Waals Materials
  • Four-Waveguide Crossing
  • Heterogeneous Integration
  • Optical attenuators
  • Optical Density Filters
  • Optical device fabrication
  • Optical imaging
  • Optical polarization
  • Optical refraction
  • Optical variables measurement
  • Optical waveguides
  • Silicon Photonics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Anisotropic Van der Waals 2D GeAs Integrated on Silicon Four-Waveguide Crossing'. Together they form a unique fingerprint.

Cite this