Abstract
We demonstrate extremely low transmittance characteristics of photonic crystals (PhCs) with a finite thickness in specific photonic bandgaps (PBGs) through numerical simulation, and clarify its origin. Some of the PhCs support decaying Bloch eigenmodes, whose propagation constant (real part of the Bloch wavenumber) as well as their decay constant (imaginary part) changes with frequency inside the bandgap. Such a class of modes can interfere destructively at the exit end of the crystal depending on their round-trip phase change, which creates comb-like valleys in their transmission spectra.
Original language | English |
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Pages (from-to) | 85-91 |
Number of pages | 7 |
Journal | Photonics and Nanostructures - Fundamentals and Applications |
Volume | 7 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2009 May 1 |
Keywords
- Complex photonic band diagram
- Evanescent modes
- Photonic bandgap
- Photonic crystal
- Wavelength filter
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Hardware and Architecture
- Electrical and Electronic Engineering