“Acceptor impurity” mode in 1-D holographic photonic crystals achieved by controlling polarization state of the incident beam
✍ Scribed by Kun Ren; Xiaobin Ren; Rong Li; Jing Zhou; Dahe Liu; Roland Kay
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 595 KB
- Volume
- 241
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
The critical incident angle -''general BrewsterÕs angle'' is introduced. The effective ''acceptor impurity'' in 1-D photonic crystals can be achieved by controlling the polarization state of the incident beam at this critical angle. When a beam with S-polarization is incident on a photonic crystal at this angle, the forbidden band still remains as it is. However, when a beam with P-polarization is incident on the same photonic crystal at this angle the forbidden band will vanish. This means that in the background of the forbidden band of S-polarization, the incident beam with Ppolarization can still pass through the photonic crystal. Thus, a status equivalent to the ''defect mode'' in semiconductors can be induced by controlling the polarization state of the incident beam. This kind of ''polarization defect'' can be controlled in real-time during practical use rather than being predetermined during fabrication of the photonic crystal, as is the case with traditional defects. A photonic crystal can, therefore, be used either as one without ''defects'' or as one with ''defects''. The theoretical analysis and experimental verifications are given in details.