Periodically segmented waveguides in Ti:LiNbO(3)

Area of Science:

• Photonics and Waveguide Technology
• Materials Science in Integrated Optics
• Lithium Niobate Devices

Background:

• Periodically segmented waveguides are crucial for optical device fabrication.
• Understanding loss mechanisms in Titanium-indiffused Lithium Niobate (Ti:LiNbO3) is essential for device performance.
• Nonconnected segments introduce unique optical behavior.

Purpose of the Study:

• To experimentally investigate the optical characteristics of periodically segmented waveguides in Ti:LiNbO3.
• To analyze the impact of segmentation period and duty cycle on near-field patterns and losses.
• To validate experimental findings with a numerical loss model.

Main Methods:

• Fabrication of periodically segmented waveguides in Ti:LiNbO3 with varying periods and duty cycles.
• Experimental measurement of near-field patterns.
• Quantification of segmentation losses (dB/cm).
• Development and application of a numerical model incorporating waveguide segmentation and surface relief losses.

Main Results:

• Near-field patterns expand as the duty cycle decreases.
• Near-field patterns are independent of the segmentation period.
• Measured segmentation losses range from 0.5 to 2.5 dB/cm.
• Losses are influenced by both segmentation period and duty cycle.

Conclusions:

• The study successfully characterized periodically segmented waveguides in Ti:LiNbO3.
• Experimental results are consistent with a numerical model accounting for waveguide segmentation and Ti indiffusion-induced surface relief.
• Findings provide valuable insights for optimizing waveguide design and minimizing losses in integrated photonic devices.