Terahertz signal generation in 1-D photonic crystals
Theoretical and numerical results arepresented to assure that a tunable,narrow-band, coherent THzradiation source can be based onparametric down-conversion in aphotonic crystal. Our proposal isbased on down-conversion mixingand a local-field enhancementmechanism that is available bytuning each of th...
| Autores: | , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | México |
| Institución: | Universidad de Guanajuato |
| Repositorio: | Redalyc-UG |
| OAI Identifier: | oai:redalyc.org:41614305 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=41614305 |
| Access Level: | acceso abierto |
| Palabra clave: | Multidisciplinarias (Ciencias Sociales) Sources Terahertz Photonic Crystals |
| Sumario: | Theoretical and numerical results arepresented to assure that a tunable,narrow-band, coherent THzradiation source can be based onparametric down-conversion in aphotonic crystal. Our proposal isbased on down-conversion mixingand a local-field enhancementmechanism that is available bytuning each of the two driving laserfields either to band-edge or to adefect mode in the band gap. Thefrequency of the down-convertedsignal can be tuned by intersectingtwo non co-linear laser sources. Thepolarizations are degenerate at normalincidence and have sub-THzdown-conversion maximum. For aspecific sample geometry we showthat by changing the angle ofincidence of one tunable laser to 30degrees the THz frequency is about11.5 THz for p-polarization and 3.5THz for s-polarization, since theangle-dependent transmissionspectrum is different for p- and spolarizations.The peak conversionefficiency for both polarizations isenhanced by over two orders ofmagnitude. Finally we also introducesome preliminary experimentalresults which agree with thenumerical results we present here. |
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