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Mode delocalization in 1D photonic crystal lasers.
Yeheng Wu1, Kenneth D Singer, Rolfe G Petschek
1Department of Physics, Case Western Reserve University, Cleveland, OH 44106, USA.
Optics Express
|November 13, 2009
Summary
Random lattice disorder in distributed Bragg lasers creates delocalized modes. We measured penetration depth and used simulations to understand how disorder affects localization length, linking in-gap and out-of-gap modes.
Area of Science:
- Physics
- Optics
- Condensed Matter Physics
Background:
- Distributed Bragg lasers (DBLs) are crucial optical devices.
- Understanding mode formation in DBLs is essential for device performance.
- Random lattice disorder can significantly impact DBL properties.
Purpose of the Study:
- Investigate the formation of in-bandgap delocalized modes in DBLs.
- Determine the effect of random lattice disorder on mode localization.
- Identify parameters controlling mode behavior in disordered DBLs.
Main Methods:
- Analysis of longitudinal mode spacing to determine lattice disorder.
- Measurement of mode penetration depth.
- Transfer matrix simulations to model mode localization and ensemble averages.
Main Results:
- Random lattice disorder leads to the formation of in-bandgap delocalized modes.
- Quantified the relationship between disorder and localization length.
- Connected in-gap delocalized modes to out-of-gap localized modes, consistent with Anderson localization theory.
Conclusions:
- Random lattice disorder plays a key role in the formation of delocalized modes within the bandgap of DBLs.
- The localization length is sensitive to lattice disorder.
- The study successfully identified key parameters governing mode behavior in disordered DBLs.
