Strontium titanate/silicon-based terahertz photonic crystal multilayer stack |
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| Authors: | J Z Xin K L Jim J Yang X J Gong L Q Chen F Gao Y H Tsang H L W Chan C W Leung |
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| Institution: | (1) Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;(2) Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China; |
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| Abstract: | 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
d
Si/STO d
STO)
N
/Si d
Si was then designed, with transmission spectra calculated by the transfer matrix method. The effects of the filling ratio (d
STO/(d
Si+d
STO)), periodicity (d
Si+d
STO) 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. |
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| Keywords: | |
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