Integrated liquid-crystal switch for both TE and TM modes: proposal and design

Area of Science:

• Photonics and Optical Engineering
• Materials Science

Background:

• Integrated optical switches are crucial components in optical communication networks.
• Existing liquid-crystal (LC) based switches often have limitations in handling different light polarizations.

Purpose of the Study:

• To propose and design an advanced integrated optical switch utilizing a weak-anchoring liquid-crystal (LC) cell.
• To develop an LC switch capable of operating effectively for both TE and TM polarization modes.

Main Methods:

• Design of a planar lightwave circuit integrating a polarization splitter, polarization converters, and a polarization combiner.
• Utilizing a weak-anchoring LC cell with a directional coupler for splitting/combining and straight waveguides for conversion.
• Incorporating LC material within etched slots and covering waveguide structures.

Main Results:

• Successful design of an integrated optical switch architecture.
• Demonstration of the switch's capability to handle both TE and TM modes.
• The proposed configuration shows superiority over existing integrated LC switches.

Conclusions:

• The designed integrated optical switch offers enhanced performance by supporting both TE and TM modes.
• This advancement in LC-based optical switching has potential applications in telecommunications and optical computing.