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Tailorable ITO thin films for tunable microwave photonic applications
Optics Express
|June 11, 2024
Summary
Post-thermal annealing enhances indium tin oxide (ITO) thin films for tunable microwave photonic devices. Annealed ITO microheaters offer lower voltage, faster response, and improved performance for reconfigurable signal processors.
Area of Science:
- Microwave Photonics (MWP)
- Materials Science
Background:
- Tunability is crucial for reconfigurable microwave photonic (MWP) signal processors.
- Indium tin oxide (ITO) thin films offer optical transparency and electrical conductivity for integrated devices.
Purpose of the Study:
- To investigate the impact of post-thermal annealing on ITO thin films for MWP applications.
- To enhance the tunability and performance of integrated MWP devices using annealed ITO.
Main Methods:
- Studied structural, electrical, and optical properties of ITO films after post-thermal annealing.
- Fabricated and tested ITO microheaters for MWP device tunability.
Main Results:
- Annealed ITO microheaters achieved low insertion loss (0.1 dB) and full free spectral range (FSR) tunability with reduced voltage.
- Demonstrated a 30% improvement in response time for annealed ITO films.
- Achieved continuous tunable radio frequency (RF) phase shifts (0-330°) from 15-40 GHz with low power (5.58 mW).
Conclusions:
- Post-thermal annealing significantly improves ITO thin film properties for MWP devices.
- Optimized ITO films enable low-loss, high-speed thermo-optic microheaters for advanced signal processing.
- This approach bridges the gap for efficient and tunable integrated photonic devices.
