Tunable terahertz beam splitter
A beam splitter and terahertz technology, which is applied in the field of terahertz optoelectronics, can solve problems such as tunable terahertz beam splitters that have not been recorded, and achieve the effects of high integration, simple working mode, and high modulation efficiency
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Embodiment 1
[0018] The central working frequency of the terahertz beam is 3THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 8μm and w s =14μm, the spacing between the central slit and the side slit l=93μm, the number of periodic grooves is 20, the groove width w g =11μm, groove depth t g =14μm, period Λ g = 65 μm. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.
[0019] Taking the model of this embodiment as an example, the implementation effect of dual-beam modulation of a tunable terahertz beam splitter with a central operating frequency of 3THZ in the present invention is obtained through simulation. Such as figure 2 As shown, when the substrate grating is not covered with graphene, the terahertz wave can produce a double beam splitting effect through diffraction, and when the substrate grating is covered with a single layer ...
Embodiment 2
[0021] The working frequency of the terahertz beam is 3THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 8μm and w s =14μm, the spacing between the central slit and the side slit l=93μm, the number of periodic grooves is 20, the groove width w g =11μm, groove depth t g =14μm, period Λ g = 85 μm. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.
[0022] Taking the model of this embodiment as an example, the implementation effect of three-beam modulation of a tunable terahertz beam splitter with a center operating frequency of 3THZ in the present invention is obtained through simulation. Such as image 3 As shown, when the substrate grating is not covered with graphene, the terahertz wave can produce a three-beam beam splitting effect through diffraction, and when the substrate grating is covered with a single layer of gr...
Embodiment 3
[0024] The central working frequency of the terahertz beam is 2THz, and the polarization type is TM polarization. Copper substrate transmission grating thickness h Cu = 36μm, the width of the central slit and side slit is w c = 12μm and w s = 21 μm, the spacing between the central slit and the side slit l = 140 μm, the number of periodic grooves is 20, the groove width w g = 16μm, groove depth t g =21μm, period Λ g 98 μm (two-beam modulation) and 128 μm (three-beam modulation), respectively. The chemical potential of single-layer graphene sheets is tuned from 0.1 eV to 0.9 eV.
[0025] Taking the model of this embodiment as an example, the implementation effect of the two-beam and three-beam modulation of the tunable terahertz beam splitter with a central operating frequency of 2THZ in the present invention is obtained through simulation, as shown in Figure 4 shown. From Figure 4 In (a) and (b), it can be seen that when the period Λ g When the chemical potential of ...
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