Long range mid-infrared propagation in Si and Ge hybrid plasmonic-photonic nano-ribbon waveguides.
We have investigated a hybrid plasmonic-photonic mode in Si and Ge channel waveguides over the 1.55-8.0 μm wavelength range. A 10-nm Cu ribbon was buried midway within a Si₃N₄ "photonic slot" centered in the semiconductor strip. For the TMo mode, propagation lengths L of several millimeters are predicted for a waveguide cross-section of about 0.7λ/n x 0.7λ/n which offers optical confinement mainly within the ~λ²/400-area slot. The L increased strongly with λ. For 0.4λ/n x 0.4λ/n channels, we found multi-centimeter propagation, but there ~60% of the propagating energy had leaked out into the thick, all-around Si₃N₄ cladding.
Haibo
H
Liang
Richard
R
Soref
Jianwei
J
Mu
Xun
X
Li
Wei-Ping
WP
Huang
D003198:Computer Simulation; D004560:Electricity; D020342:Finite Element Analysis; D005857:Germanium / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009716:Numerical Analysis, Computer-Assisted; D017785:Photons; D012825:Silicon / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D020349:Surface Plasmon Resonance
D037742:Nanotubes, Carbon; D005857:Germanium; D012825:Silicon