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Mode splitting in high-index-contrast grating with mini-scale finite size
Optics Letters
|August 13, 2016
Summary
Miniature high-index-contrast gratings exhibit mode-splitting, maintaining high Q factors on small footprints. This phenomenon is promising for compact optical communication and sensing devices.
Area of Science:
- Photonics and optical engineering.
- Nanophotonics and metamaterials.
Background:
- High-index-contrast gratings (HCGs) are key components in photonic integrated circuits.
- Understanding mode-splitting in finite-size HCGs is crucial for device miniaturization.
Purpose of the Study:
- To investigate the mode-splitting phenomenon in mini-scale HCGs.
- To explore the feasibility of maintaining high Q factors in reduced footprints.
Main Methods:
- Theoretical analysis of mode-splitting in finite-size HCGs.
- Experimental verification of the phenomenon and Q factor measurements.
Main Results:
- Observed mode-splitting in HCGs with footprints as small as 55 μm × 300 μm and 27.5 μm × 300 μm.
- Achieved high Q factors (up to ~3300 and ~2200) despite the mini-scale dimensions.
- Demonstrated survival of high-Q resonance due to boundary confinement.
Conclusions:
- Mode-splitting in mini-scale HCGs enables high Q factors on compact footprints.
- These findings present significant potential for developing miniaturized optical communication and sensing applications.
