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.
Lin
Chunchen
C
Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA. cclin@udel.edu
Chen
Caihua
C
Sharkawy
Ahmed
A
Schneider
Garrett J
GJ
Venkataraman
Sriram
S
Prather
Dennis W
DW