| Автор | Soltani, M |
| Автор | Chaker, M |
| Автор | Haddad, E |
| Автор | Kruzelesky, R |
| Дата выпуска | 2006-05-01 |
| dc.description | We have successfully fabricated two types of 1 × 2 optical switch devices, namely, all-optical switch (VO<sub>2</sub>/quartz) and electro-optical switch (VO<sub>2</sub>/TiO<sub>2</sub>/ITO/glass) based on the semiconductor-to-metallic phase transition characteristic of vanadium dioxide (VO<sub>2</sub>) smart coatings. The VO<sub>2</sub> active layer, the TiO<sub>2</sub> buffer layer and the ITO transparent conductive electrode used in these devices were achieved by reactive pulsed laser deposition. The optical switching of the fabricated devices was investigated at λ = 1.55 µm. The semiconductor (on) to metallic (off) phase transition was controlled by photo-excitation of VO<sub>2</sub> in the case of the all-optical switch and by an external electric field applied between the ITO and the VO<sub>2</sub> layer in the case of the electro-optical switch. The extinction ratio (on/off) is found to be much higher for the all-optical switch than for the electro-optical switch. For the all-optical switch, extinction ratios of about 22 and 12 dB are obtained in the transmission and reflection modes, respectively. In the case of the electro-optical switch, the extinction ratio is about 12 dB in the transmission mode and 5 dB in the reflection mode. Finally, to explain our optical switching results, we propose a simple model based on the energy band diagram of VO<sub>2</sub> in which the charge density increases under an external excitation (either photo-excitation or an electrical field), and then induces the semiconductor-to-metallic phase transition in the VO<sub>2</sub> active layer. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | 2006 IOP Publishing Ltd |
| Название | 1 × 2 optical switch devices based on semiconductor-to-metallic phase transition characteristics of VO<sub>2</sub> smart coatings |
| Тип | paper |
| DOI | 10.1088/0957-0233/17/5/S19 |
| Electronic ISSN | 1361-6501 |
| Print ISSN | 0957-0233 |
| Журнал | Measurement Science and Technology |
| Том | 17 |
| Первая страница | 1052 |
| Последняя страница | 1056 |
| Аффилиация | Soltani, M; INRS-Énergie, Matériaux et Télécommunications, 1650 Lionel Boulet, Varennes, Qc, J3X 1S2, Canada |
| Аффилиация | Chaker, M; INRS-Énergie, Matériaux et Télécommunications, 1650 Lionel Boulet, Varennes, Qc, J3X 1S2, Canada |
| Аффилиация | Haddad, E; MPB Communications Inc., 151 Hymus Boulevard, Pointe Claire, Qc, H9R 1E9, Canada |
| Аффилиация | Kruzelesky, R; MPB Communications Inc., 151 Hymus Boulevard, Pointe Claire, Qc, H9R 1E9, Canada |
| Выпуск | 5 |
