Diffraction-limited ultrabroadband terahertz spectroscopy

Abstract : Diffraction is the ultimate limit at which details of objects can be resolved in conventional optical spectroscopy and imaging systems. In the THz spectral range, spectroscopy systems increasingly rely on ultra-broadband radiation (extending over more 5 octaves) making a great challenge to reach resolution limited by diffraction. Here, we propose an original easy-to-implement wavefront manipulation concept to achieve ultrabroadband THz spectroscopy system with diffraction-limited resolution. Applying this concept to a large-area photoconductive emitter, we demonstrate diffraction-limited ultra-broadband spectroscopy system up to 14.5 THz with a dynamic range of 103. The strong focusing of ultrabroadband THz radiation provided by our approach is essential for investigating single micrometer-scale objects such as graphene flakes or living cells, and besides for achieving intense ultra-broadband THz electric fields.
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Article dans une revue
Scientific Reports, Nature Publishing Group, 2016, 6, pp.24811. 〈10.1038/srep24811〉
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Soumis le : mardi 31 mai 2016 - 12:09:02
Dernière modification le : vendredi 31 août 2018 - 09:36:03


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M Baillergeau, K Maussang, T Nirrengarten, J Palomo, L.H. Li, et al.. Diffraction-limited ultrabroadband terahertz spectroscopy. Scientific Reports, Nature Publishing Group, 2016, 6, pp.24811. 〈10.1038/srep24811〉. 〈hal-01323880〉



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