ON-CHIP TWO-OCTAVES SUPERCONTINUUM GENERATION IN MID-IR SIGE WAVEGUIDES
Natnicha Koompai, Miguel Montesinos Ballester  1@  , Christian Lafforgue  2@  , Jacopo Frigerio  3@  , Andrea Ballabio  3@  , Xavier Le Roux  4@  , Etienne Herth  5@  , Jean René Coudevylle  5@  , David Bouville  1@  , Barzaghi Andrea, Alonso Carlos Ramos  6@  , Laurent Vivien  4@  , Giovanni Isella  3@  , Delphine Marris-Morini  4@  
1 : Centre de Nanosciences et de Nanotechnologies  (C2N)
CNRS : UMR9001
2 : Centre de Nanosciences et de Nanotechnologies
Université Paris-Saclay, Centre National de la Recherche Scientifique : UMR9001
3 : Politecn Milan, LNESS Dipartimento Fis, I-22100 Como, Italy
4 : Institut d'électronique fondamentale  (IEF)  -  Website
CNRS : UMR8622, Université Paris XI - Paris Sud
bat. 220 Av Georges Clémenceau 91405 ORSAY CEDEX -  France
5 : Centre de Nanosciences et Nanotechnologies
Université Paris-Sud - Paris 11, Centre National de la Recherche Scientifique
6 : Centre de Nanosciences et Nanotechnologies  (C2N)  -  Website
Université Paris-Sud - Paris 11, Centre National de la Recherche Scientifique
10 Boulevard Thomas Gobert, 91120 Palaiseau -  France

Mid infrared spectroscopy is a widely used technique to perform molecular sensing, as most of the molecules have their fundamental vibrational and rotational resonance in this spectrum range. Each molecule absorbs light at the specific wavelength and produces a unique absorption pattern in the spectra that makes it possible to identify the targeted molecules. In this context, we present the experimental study of on chip supercontinuum generation in the mid-infrared range, Thanks to a Ge-rich graded-index platform, second-order dispersion engineering and low propagation losses are achieved. A broad spectrum is obtained from 3 to 13 μm wavelength (a spectral band of more than 2500 cm-1) for a pump wavelength at 8.5 μm, in a 5.5 mm long waveguide. Moreover, both results from numerical and experimental outcome are in agreement. Therefore, this work leads to the development of many mid-infrared wideband applications.


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