Silicon optical waveguides with buried-CoSi(2) cladding layers.

Area of Science:

• Materials Science
• Photonics
• Nanotechnology

Background:

• Silicon (Si) photonics is crucial for optical communication and computation.
• Developing low-loss waveguides is essential for efficient light propagation.
• Traditional cladding materials can be lossy or complex to integrate.

Purpose of the Study:

• To introduce a novel silicon waveguide design utilizing a buried metallic cladding.
• To investigate the optical propagation characteristics of this new waveguide structure.
• To demonstrate the feasibility of vertically integrated silicon slab waveguides with this cladding.

Main Methods:

• Fabrication of a silicon waveguide with a 50-nm cobalt disilicide (CoSi2) buried cladding layer formed by implantation.
• Experimental characterization of infrared light propagation at a 1.3-microm wavelength in a 20-microm silicon structure.
• Theoretical modeling to compare with experimental propagation loss results.

Main Results:

• Achieved propagation losses below 2.5 dB/cm for both TE(0) and TM(0) modes.
• Experimental results demonstrated good agreement with theoretical predictions.
• Successfully constructed vertically integrated silicon slab waveguides bounded by CoSi2 cladding.

Conclusions:

• The novel Si waveguide with buried CoSi2 cladding offers a promising solution for low-loss optical signal transmission.
• This approach facilitates efficient light propagation in silicon photonic integrated circuits.
• The demonstrated vertical integration capability opens avenues for advanced photonic device architectures.