A dedispersive airy beam generator on graphene surface excited by array grating
A graphene surface and beam generator technology, applied in the optical field, can solve the problems of difficult phase modulation, weak interaction between light and graphene, etc., and achieve the effect of ultra-long beam propagation distance, wide application potential, and strong binding ability.
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Embodiment 1
[0033] Graphene Surface Airy Beam Generator ( Figure 1-7 ), Figure 1-2 1 in it is a silicon dioxide or semiconductor substrate, 2 is a graphene film, and 3 is a grating array. Silica grating array height h 0 The thickness of the graphene layer is 100nm, the thickness of the graphene layer is 0.7nm, and the dielectric constant ε of silicon dioxide in the mid-infrared band is 3.9. The Fermi level is 0.65eV. When the grating period gradually increases from 0.25 to 0.35, the function curves of transmission coefficient (T), reflection coefficient (R) and absorption coefficient (A) are shown in image 3 (a). When the grating period is about 290nm, the maximum absorption coefficient of graphene plasmon waves can reach 33%. Under the maximum excitation efficiency, the electric field energy distribution of a single grating element in the x-z plane (|E x | 2 )See image 3 (b), The figure shows the graphene surface plasmon wavefield with locally enhanced amplification. The pro...
Embodiment 2
[0037] like Figure 10-12 shows that, unlike Example 1, Figure 10-11 It is the complementary structure of the Airy beam generator on the graphene surface, and the generated Airy beam propagates at the interface between the graphene and the substrate. Under the same incident light frequency of 34.88THz, the wavelength of the plasmon wave generated between the graphene dielectric interface is only 230nm, the half width of the main wave packet of the Airy beam is 350nm, and the electric field distribution on the graphene surface is shown in Figure 12. The grating array has a period of 275nm and a duty cycle of 0.3. The main lobe deflects 0.7 μm in the y direction at 8.5 μm from the end of the grating, and the half-width of the main wave packet is 780 nm at a transmission distance of 1 μm from the end of the grating. Similarly, this structure can also realize the dispersion characteristic.
[0038] The invention provides a graphene surface dedispersion Airy beam generator exci...
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