Photonic density of states and photonic bandgap of deformed titanium dioxide inverse opal structure
1
Issued Date
2022-01-01
Resource Type
eISSN
22147853
Scopus ID
2-s2.0-85133532270
Journal Title
Materials Today: Proceedings
Volume
66
Start Page
3174
End Page
3177
Rights Holder(s)
SCOPUS
Bibliographic Citation
Materials Today: Proceedings Vol.66 (2022) , 3174-3177
Suggested Citation
Sitpathom N., Muangnapoh T., Kumnorkaew P., Suwanna S., Sinsarp A., Osotchan T. Photonic density of states and photonic bandgap of deformed titanium dioxide inverse opal structure. Materials Today: Proceedings Vol.66 (2022) , 3174-3177. 3177. doi:10.1016/j.matpr.2022.06.399 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/85099
Title
Photonic density of states and photonic bandgap of deformed titanium dioxide inverse opal structure
Other Contributor(s)
Abstract
Titanium dioxide (TiO2) inverse opal, a well-ordered nanoporous media, has a good potential in light-matter enhancement application. In this work, the fabricated TiO2 inverse opal structures were prepared by well-ordered template from convective deposition. This measured photonic bandgap was shorter in wavelength from the theoretical prediction of the perfect well-ordered pore structure due to structural shrinkage and incomplete matrix fill. Shorter lattice distance from shrinkage and lower refractive index of matrix from incomplete-filled structure resulted in higher eigen energies of photonic crystal. The scanning electron microscope images indicated that the pore size of TiO2 inverse opal was reduced around 39% from the initial template size. Additionally, to explore the detail on photonic bandgap shift of deformed inverse opal, the photonic band-structures and density of states (DOS) spectra under variation of refractive index and fill fraction were evaluated by plane-wave expansion method. It was found that the zero DOS range has a narrow bandwidth at low fill fraction and refractive index of the matrix which agreed with the perturbation theory on the Hermitian Maxwell eigenvalue problem.