Group-index engineering in silicon corrugated waveguides.
We demonstrate group-index engineering in a one-dimensional periodic silicon structure consisting of a deep-etched laterally corrugated waveguide with circular holes patterned onto its wide section. Our theoretical analysis, supported by experimental results, shows that the first-order optical mode can propagate inside the Brillouin zone with a relatively high group index over a wide frequency range. Nearly constant group index as high as 13.5 over a wavelength range of approximately 14 nm is experimentally demonstrated in a 50-microm-long waveguide.
Brimont
Antoine
A
Nanophotonics Technology Center, Universidad Politécnica de Valencia, Camino de Vera s/n 46022, Valencia, Spain. abrimont@ntc.upv.es
Galán
Jose Vicente
JV
Escalante
Jose Maria
JM
Martí
Javier
J
Sanchis
Pablo
P