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year 27, Issue 1 (Iranian Nano-Photonic Conference 2020 2020)
ICOP & ICPET _ INPC _ ICOFS 2020, 27(1): 55-57 |
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Malekpour M, Granpayeh N. Graphene-lens with tunable focal length in the terahertz band. ICOP & ICPET _ INPC _ ICOFS 2020; 27 (1) :55-57
URL: http://opsi.ir/article-1-2287-en.html
URL: http://opsi.ir/article-1-2287-en.html
1- Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
Abstract: (1372 Views)
In this research, we propose a structure for focusing light in the terahertz wavelength range, where the focal length can be controlled. The structure was analyzed by using the finite-difference time-domain method. Plasmonic lenses have about wavelength or sub wavelength dimensions, which their sizes are much smaller than the dielectric ones. By placing a graphene layer in the structure and applying a voltage to it, the graphene Fermi level changes and the focal length of the beam varies up to 13.95λ; so we can electrically adjust the focal length of the flat lens.
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