TY - JOUR
T1 - Mode conversion based on dielectric metamaterial in silicon
AU - Ohana, David
AU - Levy, Uriel
N1 - Publisher Copyright:
©2014 Optical Society of America
PY - 2014
Y1 - 2014
N2 - We propose, design and analyze a novel mode converter in silicon waveguide based on a graded index co-directional grating coupler. The device has a periodic variation in its refractive index along the propagation direction and a graded index profile along the transverse direction. The graded index profile is realized by the implementation of nanoscale dielectric metamaterial consisting of silicon features that are etched into the waveguide based on the concept of effective medium. Design considerations are discussed and analyzed in details in the framework of the coupled mode theory (CMT) and the effective medium theory (EMT). Using 3D finite difference time domain (FDTD) simulations we show that the mode converter can couple between different symmetric and asymmetric modes which are propagating along a single bus multimode waveguide. Mode purity on the order of 96%, crosstalk with the input mode of better than -23dB, and transmission of more than 96% can be obtained, with device length as short as 20μm, and over ∼25nm spectral bandwidth around the design wavelength of 1550nm.
AB - We propose, design and analyze a novel mode converter in silicon waveguide based on a graded index co-directional grating coupler. The device has a periodic variation in its refractive index along the propagation direction and a graded index profile along the transverse direction. The graded index profile is realized by the implementation of nanoscale dielectric metamaterial consisting of silicon features that are etched into the waveguide based on the concept of effective medium. Design considerations are discussed and analyzed in details in the framework of the coupled mode theory (CMT) and the effective medium theory (EMT). Using 3D finite difference time domain (FDTD) simulations we show that the mode converter can couple between different symmetric and asymmetric modes which are propagating along a single bus multimode waveguide. Mode purity on the order of 96%, crosstalk with the input mode of better than -23dB, and transmission of more than 96% can be obtained, with device length as short as 20μm, and over ∼25nm spectral bandwidth around the design wavelength of 1550nm.
UR - http://www.scopus.com/inward/record.url?scp=84920024757&partnerID=8YFLogxK
U2 - 10.1364/OE.22.027617
DO - 10.1364/OE.22.027617
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:84920024757
SN - 1094-4087
VL - 22
SP - 27617
EP - 27631
JO - Optics Express
JF - Optics Express
IS - 22
ER -