|Authors: ||F. Leo, J. Safioui, B. Kuyken, G. Roelkens, S.P. Gorza|
|Title: ||Generation of coherent supercontinuum in a-Si:H waveguides: experiment and modeling based on measured dispersion profile|
|Format: ||International Journal|
|Publication date: ||11/2014|
|Journal/Conference/Book: ||Optics Express
|Volume(Issue): ||22(23) p.28997-29007|
|Internal Reference: ||[N-1657]|
Hydrogenated amorphous silicon (a:Si-H) has recently been recognized
as a highly nonlinear CMOS compatible photonic platform. We experimentally
demonstrate the generation of a supercontinuum (SC) spanning
over 500 nm in a-Si:H photonic wire waveguide at telecommunication
wavelengths using femtosecond input pulse with energy lower than 5 pJ.
Numerical modeling of pulse propagation in the waveguide, based on
the experimentally characterized dispersion profile, shows that the supercontinuum
is the result of soliton fission and dispersive wave generation.
It is demonstrated that the SC is highly coherent and that the waveguides
do not suffer from material degradation under femtosecond pulse
illumination. Finally, a direct comparison of SC generation in c-Si and
a-Si:H waveguides confirms the higher performances of a-Si:H over c-Si
for broadband low power SC generation at telecommunication wavelengths.
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