Abstract
Using conventional waveguides for light coupling and collection we numerically study band structures and transmission spectra for guided modes in line-defect waveguides obtained by removing rows of air holes in a lossless triangular-lattice two-dimensional photonic crystal. The two-dimensional finite-difference time-domain method combined with the effective index method and complemented with the coupled mode approximation is employed to analyze mode-gaps (or mini stopbands) arising from Bragg diffraction of the incident mode into the counterpropagating modes. We also show that more than 97% coupling efficiency between the ridge and the photonic crystal waveguides is achievable by adjustment of the ridge waveguide width.
| Original language | English |
|---|---|
| Article number | 155113 |
| Pages (from-to) | 1551131-1551135 |
| Number of pages | 5 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 64 |
| Issue number | 15 |
| State | Published - Oct 15 2001 |
| Externally published | Yes |