Title :
Modeling and design of an optimum transmission metallic grating for efficient excitation of terahertz waves in small-area photomixers
Author :
Mazraehno, Mohammad Tollabi ; Shahabadi, Mahmoud ; Rashed-Mohassel, Jalil-Agha
Author_Institution :
Sch. of Electr. & Comput. Eng., Univ. of Tehran, Tehran, Iran
Abstract :
In this work, we first analyze transmission metallic gratings by modal expansion and surface impedance approximation. By means of this method, an analytical model for different types of transmission resonances in metallic gratings is presented. Thereafter, an optimum metallic grating for small-area photomixers is designed and the overall performance of the photomixer is evaluated. An enhancement factor of 5.11 in terahertz current generation is achieved by using the optimized grating. It is shown that the characteristics of the designed photomixer are independent of the incident angle of the exciting laser beam.
Keywords :
diffraction gratings; laser beams; light transmission; microwave mixers; microwave photonics; optical design techniques; surface impedance; terahertz wave devices; terahertz wave generation; enhancement factor; exciting laser beam incident angle; modal expansion; optimum transmission metallic grating; small-area photomixers; surface impedance approximation; terahertz current generation; terahertz wave excitation; transmission resonances; Approximation methods; Electric fields; Gratings; Laser beams; Lighting; Optical waveguides; Plasmons; Plasmonic resonances; THz photomixers; Transmission metallic gratings; Waveguide resonances;
Conference_Titel :
Millimeter-Wave and Terahertz Technologies (MMWATT), 2014 Third Conference on
Print_ISBN :
978-1-4799-6590-8
DOI :
10.1109/MMWaTT.2014.7057213
