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Topologically protected beam splitters and logic gates based on two-dimensional silicon photonic crystal slabs
Optics Express
|November 13, 2020
Summary
We designed a topologically protected beam splitter using silicon photonic crystals. This robust device offers flexible splitting ratios and enables all-optical logic gates for optical computing.
Area of Science:
- Photonics
- Optical Computing
- Materials Science
Background:
- Beam splitters are crucial optical components for optical networks.
- Robustness is essential for reliable performance in all-optical networks.
- Existing beam splitters may lack flexibility in splitting ratios and robustness.
Purpose of the Study:
- To design a topologically protected beam splitter with tunable splitting ratios.
- To demonstrate the implementation of all-optical logic gates using the designed beam splitter.
- To investigate the robustness of the device against structural disorders.
Main Methods:
- Utilizing two-dimensional silicon photonic crystal slabs.
- Employing topological protection principles for device design.
- Implementing linear interference for logic gate construction.
Main Results:
- A topologically protected beam splitter with flexible splitting ratios (50:50, 33:67, 25:75) was successfully designed.
- All major all-optical logic gates (OR, AND, NOT, XOR, NAND, XNOR, NOR) were demonstrated using a 50:50 beam splitter.
- The devices exhibited robustness in the presence of structural disorders.
Conclusions:
- The developed topologically protected beam splitter offers tunable performance and enhanced robustness.
- The device is suitable for constructing compact and reliable all-optical logic gates.
- Potential applications in advanced optical computing and signal processing are highlighted.
