A one-dimensional photonic crystal working in the terahertz (THz) range was designed and implemented. To facilitate the design, the transmission properties of strontium titanate crystals were characterized by THz-time-domain spectroscopy. Relatively high refractive index (∼18.5) and transmission ratio (0.08) were observed between 0.2 to 1 THz. A stacked structure of (Si dSi/STO dSTO)N/Si dSiwas then designed, with transmission spectra calculated by the transfer matrix method. The effects of the filling ratio (dSTO/(dSi+dSTO)), periodicity (dSi+dSTO) and the number of repeats N on the transmission of PC were investigated. The effect of introducing a defect layer was also studied. Based on these, Si/STO multilayers with STO defect thickness of 125 μm and 200 μm were measured. The shift of the defect mode was observed and compared with the calculations.
|Number of pages||7|
|Journal||Applied Physics A: Materials Science and Processing|
|Publication status||Published - 1 Apr 2012|
ASJC Scopus subject areas
- Materials Science(all)