Spectrometer operating in visible and near-infrared

3. EXPERIMENTATION AND RESULTS
3.1 Experimentation
The structure shown in figure 1 has been manufactured by the IMEP laboratory (waveguide) and the LNIO (nanowires of gold). The experimentation has been made in the LAOG facilities. An optical view of the full-sized component is shown in figure 2. It features a 6 μm wave-guide single mode at 750 nm enhanced by 80 nanowires of gold of 50 nm. The incoming light is introduced in both side of the component through a Y junction manufactured by Team Photonics. In figure 3 one can see the optical bench designed for the experimentation (on the left) and the pattern of it. The optical bench is composed of:

• one two axis motorized positioning system which provides an aperture of 153 x 153 mm with a precision of 2 μm for the global positioning (Compact Precision XY Stage CROSS 152 from OWIS Gmbh),
• one motorized elevator stage which provides a travel of 30 mm with a precision of 6 μm for the fine tuning of the focus (Elevator Stage HVM 100 from OWIS Gmbh)
• two 5 axis micro-positioning system which hold both outside fibers of Y the junction and allow the tuning of the injections in the component (from Newport)


Figure 4. On the left there are two simulated interferograms and intensity of the scattered light by the scattering centers, on the right there are two photographs showing these situations. a) example of a position of the moving fiber in which all the scattering centers near the zero OPD scatter a maximum of light, b) example of position of the moving fiber in which all the scattering centers near the zero OPD scatter a minimum of light, c) original and rebuilt simulated interferograms.