Radiation Enhancement in Plasmonic Bias-free and Antenna-less CW Terahertz Photomixer Emitters Array | ||
| The Modares Journal of Electrical Engineering | ||
| Article 3, Volume 14, Issue 4, 2015, Pages 15-23 PDF (922.99 K) | ||
| Authors | ||
| Mohammad javad Mohammad zamani1; mohammad kazem Moravvekj farshi* 2; Mohammad Neshat3 | ||
| 1PhD student, Department of Electrical and Computer Engineering, Tarbiat Modarres | ||
| 2Professor of Electrical and Computer Engineering, Tarbiat Modarres | ||
| 3School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran. | ||
| Abstract | ||
| 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 | ||
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