RESUMO
In this work, we develop a mercury-cadmium-telluride linear array detection system that is capable of rapidly capturing (â¼1-5 s) a broad spectrum of atomic and molecular laser-induced breakdown spectroscopy (LIBS) emissions in the long-wave infrared (LWIR) region (â¼5.6-10 µm). Similar to the conventional UV-Vis LIBS, a broadband emission spectrum of condensed phase samples covering the whole 5.6-10 µm region can be acquired from just a single laser-induced microplasma or averaging a few single laser-induced microplasmas. Atomic and molecular signature emission spectra of solid inorganic and organic tablets and thin liquid films deposited on a rough asphalt surface are observed. This setup is capable of rapidly probing samples "as is" without the need of elaborate sample preparation and also offers the possibility of a simultaneous UV-Vis and LWIR LIBS measurement.
Assuntos
Compostos de Cádmio , Lasers , Compostos de Mercúrio , Análise Espectral/métodos , Substâncias para a Guerra Química/química , Raios Infravermelhos , Fenômenos Ópticos , Compostos Orgânicos/química , Percloratos/química , Potássio/química , Compostos de Amônio Quaternário/química , Espectrofotometria Atômica/métodosRESUMO
We have numerically analyzed the electromagnetic and electrical characteristics of InAsSb nBn infrared detectors employing a photon-trapping (PT) structure realized with a periodic array of pyramids intended to provide broadband operation. The three-dimensional numerical simulation model was verified by comparing the simulated dark current and quantum efficiency to experimental data. Then, the power and flexibility of the nBn PT design was used to engineer spectrally filtering PT structures. That is, detectors that have a predetermined spectral response to be more sensitive in certain spectral ranges and less sensitive in others.