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A photoconductive logarithmic spiral antenna with saw-toothed plasmonic contact electrodes is proposed to provide a higher terahertz radiation compared with the conventional photoconductive antenna (PCA). The use of saw-toothed plasmonic contact electrodes creates a strong electric field between the anode and cathode, which generates a larger photocurrent and thereby effectively increases the terahertz radiation. The proposed PCA was fabricated and measured in response to an 80 fs optical pump from a fiber-based femtosecond laser with a wavelength of 780 nm. When the proposed antenna is loaded with an optical pump power of 20 mW and a bias voltage of 40 V, a broadband pulsed terahertz radiation in the frequency range of 0.1–2 THz was observed. Compared to the conventional PCA, the THz power measured by terahertz time domain spectroscopy (THz-TDS) increased by an average of 10.45 times.

ResumenEn el año 1945 se decide construir un Orfelinato Minero, pretendiendo también erigir un "monumento al trabajo". La solución propuesta consiste en la creación de una ciudad tradicional, ideal, cerrada y autosuficiente.Curiosamente, los espacios más propiamente dedicados al mundo del trabajo, como corresponde a los talleres, van a resultar un tanto marginados (no principales) en cuanto a su ubicación y representatividad. Así, los talleres aparecen en los "arrabales extramuros" de la ciudad y además estas edificaciones son ocultadas tras "nuevos recintos amurallados".Sin embargo los talleres de la Universidad Laboral de Gijón no están carentes de valores, muy al contrario estos espacios industriales poseen una organización, composición, funcionalidad y estética que hacen de ellos una obra maestra de la arquitectura industrial.Tras la reciente rehabilitación del complejo arquitectónico, estos espacios industriales han sido elegidos para albergar al nuevo centro, conocido como "Laboral Centro de Arte y Creación Industrial" con la clara pretensión de ser un centro de referencia internacional en el arte, ciencia, tecnología e industrias visuales avanzadas.AbstractThe decision to build the "Home for Miners' Orphans" was adopted in 1945, Also intended to be a "monument to labour", this complex was designed and built as a traditional, ideal, enclosed and self-sufficient city.Oddly, rather minor importance was attached to the areas most characteristic of the working world, namely the shops, judging from their peripheral location and scant visibility, built as they were on the outskirts of the city and concealed behind "new walled compounds".And yet the Gijón Vocational University workshops are not lacking in attractive features; on the contrary, for their organization, composition, functionality and aesthetics, they can be regarded to be a masterpiece of industrial architecture.On the occasion of the recent rehabilitation of the architectural complex, this industrial area has been chosen to house a new institution, the "Vocational University Centre for the Arts and Industrial Creation", which explicitly aims to become an international benchmark in art, science, technology and advanced video industries.