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Dynamic increase and decrease of photonic crystal nanocavity Q factors for optical pulse control.
Jeremy Upham1, Yoshinori Tanaka, Takashi Asano
1Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan. jeremy@qoe.kuee.kyoto-u.ac.jp
Optics Express
|December 24, 2008
Summary
Researchers demonstrate dynamic control over photonic crystal nanocavity Q factors. This allows capturing and releasing ultrafast optical signals on demand, advancing light-matter interaction studies.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Photonic crystal nanocavities offer strong light confinement.
- Controlling nanocavity properties dynamically is crucial for advanced optical signal processing.
Purpose of the Study:
- To introduce novel methods for dynamic Q factor control in photonic crystal nanocavities.
- To demonstrate the capture and on-demand release of ultrafast optical pulses using this dynamic control.
Main Methods:
- Rapidly increasing the Q factor of a nanocavity from 3800 to 22,000.
- Timing the Q factor increase to capture a 4 picosecond (ps) signal pulse.
- Performing a secondary Q factor transition to eject the captured light.
Main Results:
- Successfully captured a 4 ps signal pulse within the nanocavity.
- Achieved a photon lifetime of 18 ps, enabling pulse storage.
- Demonstrated on-demand ejection of the stored light pulse.
Conclusions:
- Dynamic Q factor modulation provides a viable mechanism for controlling light within nanocavities.
- This technique enables on-demand storage and release of ultrafast optical signals.
- Advances in dynamic nanocavity control open new avenues for optical buffering and signal processing.
