SOFRADIR is widely present on the IR detector market for high-performance space, military and security applications
thanks to a well mastered Mercury Cadmium Telluride (MCT) technology, and to the recent acquisition of the III-V
InSb, InGaAs, and QWIP technologies. As a result, strong and continuous development efforts are deployed to deliver
cutting edge products with improved performances in terms of sensitivity, spatial and thermal resolution. The actual
trend in quantum IR detector development is the design of very small pixel, with high operating temperature. The selfconfinement
of neighboring diodes may not be efficient enough to maintain optimal modulation transfert function
This paper presents the recent developments achieved in Sofradir in terms of MTF measurements protocol challenged by
the pitch reduction. An overview of state of the art MTF results with optimized measurement technic will be shown,
from SWIR to VLWIR MCT focal plane. In order to optimize device performances and reduce development cycle time,
this experimental approach has been coupled with finite elements modelisation (FEM). Optimized MTF results for 10μm
pitch and HOT MCT technology will be exposed.
In the astrophysical context of the search for Earth-like extrasolar planets, an important research effort has been done for
the realization of single-mode integrated optics devices for mid-infrared space-based interferometry. Preparatory projects
like FKSI , where rejection of high order modes is required to a level better than 40dB, will need photonic devices
that achieve modal filtering and beam combination in the mid-IR band. In this context, we present results on midinfrared
planar integrated optic beam combiners characterized at LAOG using chalcogenide and silver halide materials.
We show results on FTS measurements, allowing to determine the single mode spectral domain, as well as interference
fringes obtained from Y-junctions realized on these materials.
One of the critical issues for nulling interferometry breadboards for exo-earth detection relies on the possibility
to manufacture and properly characterize optical waveguides that present suitable single mode behaviors in the
foreseen spectral range (4-20 μm). We developed a dedicated bench for the characterization of available guides
for the considered spectral range, in particulary silver halide fibers. This interferometric bench achieves modal
characterization in nulling mode and spectral transmission in Fourier Transform spectrometer mode, defining
the single mode domain of the components. We present the experimental setup and its performances. We
present also some characterization of their single-mode behavior according to the injection conditions. These
measurements are very useful for the conception of optimized components.