Volume 14, Issue 4 (2015)
MJEE 2015, 14(4): 15-23 |
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Mohammad zamani M J, Moravvekj farshi M K, Neshat M. Radiation Enhancement in Plasmonic Bias-free and Antenna-less CW Terahertz Photomixer Emitters Array. MJEE 2015; 14 (4) :15-23
URL: http://mjee.modares.ac.ir/article-17-11908-en.html
URL: http://mjee.modares.ac.ir/article-17-11908-en.html
Radiation Enhancement in Plasmonic Bias-free and Antenna-less CW Terahertz Photomixer Emitters Array
1- PhD student, Department of Electrical and Computer Engineering, Tarbiat Modarres
2- Professor of Electrical and Computer Engineering, Tarbiat Modarres
3- School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran.
2- Professor of Electrical and Computer Engineering, Tarbiat Modarres
3- School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran.
Abstract: (5115 Views)
We propose a new generation of unbiased (bias-free) antenna-less CW THz photomixer emitters array made of asymmetric MSM gratings with subwavelength pitch, operating in optical near-field regime. We take advantage of the size effects in near-field optics and electrostatics to demonstrate the possibility of enhancing the THz power by four orders of magnitude, as compared with a similar array of the same size that operates in the far-field regime. We show that with an appropriate choice of grating parameters in such THz sources the first plasmonic resonant cavity mode in nano-slit between two adjacent MSM can enhance the optical near-field absorption and hence the photo carriers’ generation under the slit in the active medium. These photo carriers, on the other hand, are accelerated by the large built-in electric field sustained under the nano-slits by two dissimilar Schottky barriers to create the desired large THz power that is mainly radiated downward. A hybrid numerical simulation method is used to model and analyze these phenomena.
Keywords: Photomixer, Terahertz Emitters, Metal-Semiconductor-Metal, Plasmonics, Subwave-length structures
Received: 2016/06/1 | Accepted: 2015/01/21 | Published: 2016/08/31
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