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A Narrow Spectrum Terahertz Emitter Based on Graphene Photoconductive Antenna

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Abstract

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.

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Funding

One of the authors, G. Jemima Nissiyah, received financial support for this research work from “Visvesvaraya PhD scheme of Electronics and IT” (Lr.No.PhD-MLA/ 4(65)/2015-16/01, dt.16.03.2016), DeitY.

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  1. Department of Electronics Engineering, MIT Campus, Anna University, Chennai, 600044, India

    G. Jemima Nissiyah & M. Ganesh Madhan

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  1. G. Jemima Nissiyah
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  2. M. Ganesh Madhan
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Correspondence to G. Jemima Nissiyah.

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Nissiyah, G.J., Madhan, M.G. A Narrow Spectrum Terahertz Emitter Based on Graphene Photoconductive Antenna. Plasmonics 14, 2003–2011 (2019). https://doi.org/10.1007/s11468-019-00998-7

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