Title :
Generation of THz radiation: Metallic metamaterial grating versus lamellar grating
Author :
Bera, A. ; Barik, R.K. ; Min, S.H. ; Kwon, O.J. ; Baek, I.K. ; Kim, S. ; Sattorov, M.A. ; Park, G-S
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea
Abstract :
The Smith-Purcell radiation (SPR) in metallic metamaterial grating is studied theoretically. This metallic metamaterial is a one-dimensional array of slits with sub-wavelength period perforated on a perfect metallic film, which supports discrete guided modes in presence of convective electron bunch near its surface. It is also found that SPR intensity is enhanced when guided modes couple with diffraction mode. The comparison with lamellar grating shows that the metamaterial grating is more effective converter of evanescent field associates with running charge into radiation. This structure would be promising to develop intense narrow-band Smith-Purcell radiation based THz sources.
Keywords :
diffraction gratings; optical arrays; optical films; optical metamaterials; terahertz wave generation; terahertz waves; THz radiation generation; convective electron bunch; diffraction mode; discrete guided modes; lamellar grating; metallic film; metallic metamaterial grating; narrow-band Smith-Purcell radiation; one-dimensional slit array; Dispersion; Electromagnetic waveguides; Films; Frequency measurement; Gratings; Metals; Metamaterials;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on
Conference_Location :
Wollongong, NSW
Print_ISBN :
978-1-4673-1598-2
Electronic_ISBN :
2162-2027
DOI :
10.1109/IRMMW-THz.2012.6379483