Efficient terahertz coupling lens based on planar photonic crystals on silicon on insulator.
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.
Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA. cclin@udel.edu
Chunchen
C
Lin
Caihua
C
Chen
Ahmed
A
Sharkawy
Garrett J
GJ
Schneider
Sriram
S
Venkataraman
Dennis W
DW
Prather