Polyimide optical waveguides fabricated with electron beam lithography.

Area of Science:

• Materials Science
• Optoelectronics
• Nanofabrication

Background:

• Optical waveguides are essential components in integrated photonics.
• Traditional fabrication methods can result in rough sidewalls, increasing signal loss.
• Polymer-based waveguides offer flexibility and cost-effectiveness.

Purpose of the Study:

• To develop a fabrication technique for high-performance polymer optical waveguides.
• To investigate the impact of sidewall smoothness on waveguide performance.
• To enable the production of narrow, low-loss waveguides on planar substrates.

Main Methods:

• Fabrication of poly(methyl methacrylate) (PMMA) clad polyimide waveguides.
• Utilizing electron beam lithography for high-resolution patterning.
• Characterization of waveguide sidewall smoothness and optical loss.

Main Results:

• Electron beam lithography produced exceptionally smooth sidewalls on the waveguides.
• The smooth sidewalls facilitated the creation of narrow waveguides.
• Low optical loss was achieved in the fabricated waveguides.

Conclusions:

• Electron beam lithography is a viable method for fabricating high-quality polymer waveguides.
• Smooth sidewalls are critical for achieving low loss in narrow waveguides.
• This technique supports the development of advanced integrated photonic devices.