Refractive Index Contrast Polymers: Photoresponsive Systems with Spatial Modulation of Refractive Index for Photonics

Area of Science:

• Polymer Science
• Photonics
• Materials Science

Background:

• Developing optically transparent polymers with high refractive index (RI) is crucial for photonics.
• Creating photoresponsive polymers for spatially controlled RI modulation presents a significant challenge.
• Refractive index contrast (RIC) is essential for fabricating integrated photonic devices, such as polymer waveguides.

Purpose of the Study:

• To synthesize novel optical polymers for photonics applications.
• To enable precise spatial control of refractive index (RI) in thin films using photopatterning.
• To develop a method for fabricating polymer waveguides with high refractive index contrast (RIC).

Main Methods:

• Synthesis of tailored optical polymers, termed Refractive Index Contrast (RIC) polymers.
• Photopatterning of RIC polymers using UV exposure in the presence of a photoacid generator.
• Fabrication of polymer waveguides via direct laser writing.

Main Results:

• UV exposure permanently increased the RI in the exposed regions of RIC polymers.
• This process created high RIC regions, forming the core of waveguides in a single step.
• Waveguides fabricated from RIC polymers exhibited propagation losses of approximately 2 dB/cm at 1550 nm.

Conclusions:

• The developed RIC polymers offer a novel approach for photopatterning refractive index with spatial precision.
• This method enables rapid fabrication of photonic devices, including polymer waveguides, through direct laser writing.
• The low propagation losses demonstrate the potential of RIC polymers for integrated photonics applications.