UV patterned nanoporous solid-liquid core waveguides.

Area of Science:

• Materials Science
• Optoelectronics
• Polymer Chemistry

Background:

• Nanoporous polymers offer unique platforms for optical applications due to their tunable properties.
• Developing cost-effective and efficient waveguide fabrication methods is crucial for integrated optics.

Purpose of the Study:

• To fabricate solid-liquid core waveguides using UV-induced surface modification of nanoporous polymers.
• To achieve a high refractive index contrast through selective water infiltration.
• To characterize the optical performance, including propagation and bend losses.

Main Methods:

• Preparation of nanoporous polymer films.
• UV light exposure to selectively render polymer surfaces hydrophilic.
• Controlled water infiltration to form the waveguide core.
• Measurement of propagation loss and bend loss.

Main Results:

• Successfully fabricated solid-liquid core waveguides with a high index contrast (Δn = 0.20).
• Achieved low propagation loss of 0.62 dB/mm.
• Demonstrated low bend loss of 0.81 dB/90° for a bend radius as small as 1.75 mm.
• The waveguide core was precisely defined by the UV-patterned hydrophilic regions.

Conclusions:

• UV-induced surface modification provides an effective method for creating tunable solid-liquid core waveguides.
• These waveguides exhibit promising low loss characteristics for optical applications.
• The technique allows for precise control over waveguide geometry and optical properties.