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| | === [http://batemp.cnea.gov.ar/mediawiki/index.php BT-Wiki] === | | === [http://batemp.cnea.gov.ar/mediawiki/index.php BT-Wiki] === |
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| − | == Seminario de Materia Condensada ==
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| − | Bajas Temperaturas y Teoría de Sólidos
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| − | '''"Ultra-fast Photoconductive Mixers with vertically Illuminated Traveling-wave Geometry for Efficient Terahertz Generation"'''
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| − | Dr. Ernest Michael
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| − | Dto. Ingeniería Eléctrica,Facultad de Ciencias Física y Matematica, U. de Chile
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| − | 25 / 6 / 2009 -- 11 : 00 Aula BT-T
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| − | <br> One of the last frontiers in the electromagnetic spectrum is the terahertz-range because of the reduced availability of sufficiently strong, coherent and tunable continuous-wave radiation sources. The THz-range is important because of its spectroscopic potential. However, the efficiency, tunability and output power of these sources still needs to be increased towards higher frequencies, towards "closing the THz-gap". Photomixers, generating radiation at the difference frequency of two tunable lasers in the near-infrared, would have a high potential to provide frequency-agile sources for many applications like radio-astronomy, highest-resolution spectroscopy, environmental sensing, and spectral imaging techniques (home security and medical diagnostics). Fastest and efficient materials and structures are needed to proceed into the THz-gap, while the RC-limitation of such devices was demonstrated to be bypassed by using traveling-wave structures with vertical illumination. This imposes interesting cutting-edge tasks in material research and nano-fabrication for these devices. An idea of the recent research in the field of THz-generating photomixers is given and next steps are proposed.
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Revisión del 10:32 3 jul 2009
La División Bajas Temperaturas posee más de 40 años de experiencia en el estudio de propiedades de la materia condensada a bajas temperaturas. Durante un largo período la actividad del laboratorio se centró en la investigación de materiales superconductores y de sistemas electrónicos fuertemente correlacionados. Sin embargo, en los últimos años las líneas de investigación del grupo se han diversificado considerablemente. Además de los temas mencionados, actualmente se estudian películas delgadas y multicapas de manganitas magnetorresistentes, coexistencia de magnetismo y superconductividad, propiedades del He superfluído, sistemas mesoscópicos, entre otras.
en:Portada/en
