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Updated: Aug 2, 2026
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Slow light in periodic superstructure Bragg gratings.
D Janner1, G Galzerano, G Della Valle
1Dipartimento di Fisica and Istituto di Fotonica e Nanotecnologie del CNR, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
Summary
Researchers analyzed group velocity reduction in periodic superstructure Bragg gratings. They experimentally demonstrated this reduction for optical communication wavelengths using Moiré fiber gratings.
Area of Science:
- Photonics and optical engineering
- Condensed matter physics
- Wave propagation phenomena
Background:
- Periodic structures like Bragg gratings are crucial for controlling light propagation.
- Understanding and manipulating the group velocity of light is essential for optical communication systems.
- Superstructure gratings offer enhanced control over optical properties compared to simple gratings.
Purpose of the Study:
- To theoretically analyze group velocity reduction in periodic superstructure Bragg gratings.
- To experimentally demonstrate significant group velocity reduction.
- To achieve this reduction at wavelengths relevant to optical communications.
Main Methods:
- Theoretical modeling of light propagation in periodic superstructure Bragg gratings.
- Experimental fabrication and characterization of Moiré fiber gratings.
- Measurement of pulse propagation characteristics to determine group velocity.
Main Results:
- A comprehensive theoretical framework for group velocity reduction was established.
- Experimental demonstration of group velocity reduction was achieved using a Moiré fiber grating.
- Successful reduction of group velocity for sub-nanosecond pulses at optical communication wavelengths.
Conclusions:
- Periodic superstructure Bragg gratings are effective for controlling light group velocity.
- Moiré fiber gratings provide a viable platform for achieving significant group velocity reduction.
- This work has implications for developing advanced optical communication technologies.
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