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year 27, Issue 1 (Iranian Nano-Photonic Conference 2020 2020)
ICOP & ICPET _ INPC _ ICOFS 2020, 27(1): 1-3 |
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Pakfetrat F, Pakarzadeh H, Sharif V. The impact of geometric structure on terahertz plasmonic lasers with distributed feedback. ICOP & ICPET _ INPC _ ICOFS 2020; 27 (1) :1-3
URL: http://opsi.ir/article-1-2237-en.html
URL: http://opsi.ir/article-1-2237-en.html
1- Physics Department, Shiraz University of Technology, Shiraz, Iran
Abstract: (1489 Views)
Plasmonic lasers generate coherent surface-plasmon polaritons (SPPs). Plasmonic cavities are utilized for terahertz quantum-cascade lasers (QCLs), which are the brightest available solid-state sources of terahertz radiation (frequency∼ 0.1 THz - 10 THz, wavelength∼ 30 µm - 3 mm). Unlike conventional lasers that could produce directional beams, plasmonic lasers have highly divergent radiation patterns due to their subwavelength apertures. The effective distributed feedback (DFB) method in quantum cascade lasers is a one-dimensional interfering grating (Bragg diffraction). There is a new method for using distributed feedback (DFB) which is called the antenna feedback scheme leads to single-mode operation in plasmonic lasers. In this paper, using antenna feedback design and two-dimensional simulation, by changing the thickness of the absorbing boundaries at both longitudinal ends of the cavity, we achieve a loss lower than 5.9 cm-1 and an intensity height of approximately 135 µm for the output beam. Also, by changing the width and thickness of the metal grating, the output beam can be tilted or vertically oriented. We will see that tilted output has a higher resonant frequency loss and more intensity height than the vertical output.
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