From arrays of THz antennas to large-area emitters
| Autor: | Daniel Segovia-Vargas, E. Ugarte-Munoz, V. Gonzalez-Posadas, Sascha Preu, Luis Enrique Garcia-Munoz, Javier Montero-de-Paz, Alejandro Rivera-Lavado, Stefan Malzer, S. T. Bauerschmidt, Gottfried H. Döhler |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Telecomunicaciones Radiation business.industry Terahertz radiation Physics::Optics 020206 networking & telecommunications 02 engineering and technology 021001 nanoscience & nanotechnology 7. Clean energy Photomixing Optics Semiconductor Side lobe 0202 electrical engineering electronic engineering information engineering Optoelectronics Charge carrier Electrical and Electronic Engineering Antenna (radio) 0210 nano-technology business Common emitter |
| Zdroj: | IEEE Transactions on teraHertz Science and Technology, ISSN 2156-342X, 2013-09, Vol. 3, No. 5 Archivo Digital UPM Universidad Politécnica de Madrid |
| Popis: | Arrays of coherently driven photomixers with antenna (antenna emitter arrays, AEAs) have been evaluated as a possibility to overcome the power limitations of individual conventional photomixers with antenna (?antenna emitters?, AEs) for the generation of continuous-wave (CW) THz radiation. In this paper, ?large area emitters? (LAEs) are proposed as an alternative approach, and compared with AEAs. In this antenna-free new scheme of photomixing, the THz radiation originates directly from the acceleration of photo-induced charge carriers generated within a large semiconductor area. The quasi-continuous distribution of emitting elements corresponds to a high-density array and results in favorable radiation profiles without side lobes. Moreover, the achievable THz power is expected to outnumber even large AEAs. Last not least, the technological challenge of fabricating LAEs appears to be significantly less demanding. |
| Databáze: | OpenAIRE |
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