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Laser-Induced Erasable and Re-Writable Waveguides within Silver Phosphate Glasses
Konstantinos Tsimvrakidis1, Ioannis Konidakis1, Emmanuel Stratakis1
1Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 71110 Heraklion, Greece.
Materials (Basel, Switzerland)
|May 20, 2022
Summary
Femtosecond laser writing enables reversible fabrication of buried waveguides in silver metaphosphate glass. This technique allows for infinite write/erase/re-write cycles without structural damage, paving the way for novel photonic devices.
Area of Science:
- Materials Science
- Optics and Photonics
- Laser Physics
Background:
- Femtosecond direct laser writing is a key technique for fabricating photonic structures.
- Reversible modification of optical materials is crucial for advanced applications.
Purpose of the Study:
- To demonstrate the fabrication, erasure, and rewriting of buried waveguides in AgPO3 glass using a single femtosecond laser.
- To investigate the structural integrity and potential for reversible optoelectronic applications.
Main Methods:
- Utilized a femtosecond laser source for direct laser writing of waveguides in AgPO3 glass.
- Employed controlled variations in laser power, scanning speed, and repetition rate to achieve writing, erasing, and rewriting.
- Characterized the fabricated structures using Scanning Electron Microscopy (SEM) and spatial Raman analysis.
Main Results:
- Successfully fabricated buried waveguides in AgPO3 glass.
- Demonstrated a repeatable write/erase/re-write process by adjusting laser parameters.
- Confirmed that the process does not induce structural modifications to the phosphate network.
Conclusions:
- The developed femtosecond laser process allows for reversible waveguide fabrication in AgPO3 glass.
- The non-ablative nature, attributed to local glass network relaxation, enables infinite write/erase/re-write cycles.
- This technique offers a promising route for developing advanced, reconfigurable photonic devices.
