Measurement of a band-edge tail in the density of states of a photonic-crystal waveguide
| Abstract | We investigate light transport near the band edge of slow-light photonic-crystal waveguides using phase-sensitive near-field microscopy. We obtain and interpret high-resolution band structures, allowing the retrieval of the optical density of states for a one-dimensional periodic system with weak intrinsic disorder. Because of this disorder, the band edge is smeared out and the van Hove singularity is removed. The density of states shows a decaying “tail” in the band gap corresponding to Anderson-localized modes, as predicted by Lifshitz for solid-state systems. |
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| Authors | S. R. Huisman, G. Ctistis, S. Stobbe, A. P. Mosk, J. L. Herek, A. Lagendijk, P. Lodahl, W. L. Vos, and P. W. H. Pinkse |
| Year of publication | 2012 |
| Date published | 10/2012 |
| Journal | Phys. Rev. B. |
| Volume | 86 |
| Pages | 155154: 1-4 |
| DOI number | 10.1103/PhysRevB.86.155154 |
| Keywords | 2D photonic crystals, density of states, localization, Near-Field optical microscopy |