Fluorescence and Phosphorescence Dual-Emission Liquid Crystal Polymer Optical Waveguide for Logical Gate.

Area of Science:

• Materials Science
• Optoelectronics
• Information Security

Background:

• Information security is a growing concern.
• Optical logic gates offer enhanced security potential.
• Developing active optical waveguide materials (OWMs) with dual emission is challenging.

Purpose of the Study:

• To present a novel room-temperature phosphorescent liquid crystalline polymer (RTP LCP) as an active OWM.
• To demonstrate its fluorescence-phosphorescence dual emission capabilities.
• To evaluate its suitability for optical logic gates.

Main Methods:

• Synthesized and characterized RTP LCP.
• Investigated its liquid crystalline phases and phosphorescence lifetime.
• Fabricated oriented liquid crystal fibers and encapsulated them.
• Conducted optical waveguide experiments to measure optical loss coefficients (OLCs).

Main Results:

• RTP LCP exhibited smectic and nematic phases within specific temperature ranges.
• Achieved a phosphorescence lifetime of 2.77 ms.
• Demonstrated fluorescence-phosphorescence dual emission in oriented fibers.
• Measured low OLCs of 0.20 dB/mm at 490 nm and 0.17 dB/mm at 565 nm.
• Successfully implemented these OWMs in optical logic gates.

Conclusions:

• The developed RTP LCP is a viable active OWM for dual emission.
• It shows promise for creating efficient optical logic gates.
• This advancement supports the development of next-generation information security technologies.