A Narrow Spectrum Terahertz Emitter Based on Graphene Photoconductive Antenna

Autor:	M. Ganesh Madhan, G. Jemima Nissiyah
Rok vydání:	2019
Předmět:	Materials science Terahertz radiation Biophysics Physics::Optics 02 engineering and technology 01 natural sciences Biochemistry Directivity law.invention 010309 optics law 0103 physical sciences Spectral width Dipole antenna Computer Science::Information Theory Condensed Matter::Other business.industry Astrophysics::Instrumentation and Methods for Astrophysics 021001 nanoscience & nanotechnology Stub (electronics) Dipole Q factor Optoelectronics 0210 nano-technology business Stripline Biotechnology
Zdroj:	Plasmonics. 14:2003-2011
ISSN:	1557-1963 1557-1955
DOI:	10.1007/s11468-019-00998-7
Popis:	Many terahertz applications such as sensing, imaging, and spectroscopy require coherent terahertz (THz) sources. A basic Ti-Au dipole antenna on GaAs substrate is designed initially and it is enhanced into a photoconductive antenna for terahertz emission. A spectral width of 120 GHz is obtained from the emission spectrum. In order to compare the spectral characteristics, a graphene dipole antenna is designed on the same substrate. It is observed that graphene dipole yields a narrower spectral width of 70 GHz, due to its high Q factor. Spectral width of the graphene dipole antenna is further made narrow to 25 GHz, by incorporating a λ/4 stub on the stripline to produce a filtering operation. The antenna provides a directivity of 6.14 dBi with stub which shows an improvement of 0.3 dB when compared with an antenna without stub.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1bf68604ddd875b2a1fc59302aabb32d https://doi.org/10.1007/s11468-019-00998-7 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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