Terahertz multispectral imaging by thermo-conversion using MIM antenna

International audienceConversion of terahertz radiation into thermal radiation is a low-cost approach for terahertz detection by standard infrared camera. In this work, THz→IR thermo-conversion is performed by the combination of a THz absorber made of MIM antenna and an emissive layer made of carbon nanotubes. Structural and optical characterizations of the membrane are done, and multispectral imaging in the terahertz range is demonstrated

Terahertz multispectral imaging by thermo-conversion using MIM antenna

International audienceConversion of terahertz radiation into thermal radiation is a low-cost approach for terahertz detection by standard infrared camera. In this work, THz→IR thermo-conversion is performed by the combination of a THz absorber made of MIM antenna and an emissive layer made of carbon nanotubes. Structural and optical characterizations of the membrane are done, and multispectral imaging in the terahertz range is demonstrated

Millimeter waves Radar: A way to see through the airplane covering?

International audienceThe usability of Ultra Wide Band terahertz radar technique for inspection and imaging of objects of interest for the aeronautics industry is under investigation in this paper. Frequency-modulated continuous-wave (FMCW) radar principle and systems will be detailed along with its benefits and limitations depending on the architecture and characteristics of the system as well as the materials under inspection. Promising results and advances in the airplane covering see-through problematic are also demonstrated through measurements that have been performed with our imaging systems, demonstrating the suitability of FMCW radars as a new tool for Non Destructive Testing (NDT) applications for the aeronautics industry

Cooperative interactions between nano-antennas in a high-Q cavity for unidirectional light sources

We analyse the resonant mode structure and local density of states in high-Q hybrid plasmonic-photonic resonators composed of dielectric microdisks hybridized with pairs of plasmon antennas that are systematically swept in position through the cavity mode. On the one hand, this system is a classical realization of the cooperative resonant dipole–dipole interaction through a cavity mode, as is evident through predicted and measured resonance linewidths and shifts. At the same time, our work introduces the notion of ‘phased array’ antenna physics into plasmonic-photonic resonators. We predict that one may construct large local density of states (LDOS) enhancements exceeding those given by a single antenna, which are ‘chiral’ in the sense of correlating with the unidirectional injection of fluorescence into the cavity. We report an experiment probing the resonances of silicon nitride microdisks decorated with aluminium antenna dimers. Measurements directly confirm the predicted cooperative effects of the coupled dipole antennas as a function of the antenna spacing on the hybrid mode quality factors and resonance conditions