Efficient terahertz coupling lens based on planar photonic crystals on silicon on insulator |
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| Authors: | Lin Chunchen Chen Caihua Sharkawy Ahmed Schneider Garrett J Venkataraman Sriram Prather Dennis W |
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| Institution: | Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA. cclin@udel.edu |
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| Abstract: | We present a promising coupling device, namely, a terahertz (THz) planar photonic crystal (PhC) lens based on the effective refractive-index contrast between the PhC and the surrounding unpatterned area. Three-dimensional finite-difference time-domain calculations show a 90% power transfer from a 100-microm silicon waveguide to a 10-microm waveguide, and 45% coupling efficiency is confirmed experimentally. These results demonstrate the utility of the PhC lens as an effective approach to coupling into PhC THz circuits. |
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