Influence of infrared optical properties by transformation of the crystal structure in Al-doped vanadium dioxide films
| Autor: | Xuefei Wu, Chunhui Ji, Zhiming Wu, Yong Zhou, Xueting Ma, Yuanjie Su, Jun Wang, Haoqian Feng, Yadong Jiang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Phonon Infrared business.industry Doping 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials Crystal Condensed Matter::Materials Science symbols.namesake Optics Normal mode Condensed Matter::Superconductivity 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Absorption (electromagnetic radiation) Raman spectroscopy business |
| Zdroj: | Optical Materials Express. 6:3500 |
| ISSN: | 2159-3930 |
| Popis: | Some infrared-active phonons in VO2 films suppress their modulation performance in the infrared region. Al-doped VO2 films, due to transforming VO2 crystal into the M2 phase, promptly eliminate absorption peaks in far-IR/THz bands and present widely modulating properties. Furthermore, we found high-frequency shifts of phonon vibration modes in Raman spectra by Al doping, indicating the stronger V-O bonds as the evidence of VO2 crystalline modification. However, although the high-frequency shifts and peak broadening were observed in V-O-V bending modes, mid-infrared spectra as the other phonon characterization show that its resonances are less involved, which is different from the remarkable variation of THz phonons. We attribute the difference to the distinct origins of phonon vibrations. As Al doped into films, the group-rotational peaks were rapidly erased with crystalline deformation whereas the high-frequency bending modes only slightly changed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|