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Engineering third-order optical nonlinearities in hybrid chalcogenide-on-silicon platform.
Optics Letters
|October 16, 2019
Summary
We developed novel hybrid As2S3-Si slot waveguides exhibiting high nonlinearity for efficient all-optical devices. These structures surpass critical figures of merit for integrated photonics, enabling robust ultrafast signal processing.
Area of Science:
- Integrated photonics
- Nonlinear optics
- Materials science
Background:
- Silicon photonics offers a scalable platform for optical devices.
- Chalcogenide glasses like As2S3 possess strong nonlinear optical properties.
- Hybrid structures can combine the advantages of different materials.
Purpose of the Study:
- To demonstrate highly nonlinear hybrid As2S3-Si slot waveguides.
- To quantify the nonlinear properties using advanced measurement techniques.
- To assess the suitability for efficient nonlinear integrated photonics.
Main Methods:
- Fabrication of hybrid waveguides by infiltrating As2S3 into silicon slot structures.
- Precise quantification of nonlinear properties using a bidirectional top-hat D-scan method.
- Experimental characterization of waveguide performance at near-infrared wavelengths.
Main Results:
- Demonstrated hybrid As2S3-Si slot waveguides with a two-photon absorption (TPA) figure of merit > 2.
- Achieved phase shifts greater than π with minimal optical losses.
- Validated waveguides meet critical criteria (FOMTPAwg>1) for efficient nonlinear integrated photonics.
Conclusions:
- Hybrid As2S3-Si slot waveguides exhibit excellent nonlinear performance.
- These structures are promising for developing efficient and robust ultrafast all-optical devices.
- The findings support the integration of advanced nonlinear functionalities into large-scale silicon photonics.
