Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

J. Z. Xin, K. L. Jim, J. Yang, X. J. Gong, L. Q. Chen, F. Gao, Yuen Hong Tsang, H. L.W. Chan, Chi Wah Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


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.
Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Issue number1
Publication statusPublished - 1 Apr 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)


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