Acta Physica Sinica, Volume. 69, Issue 15, 154103-1(2020)
Fig. 2. (a) Diagram of wave-vector matching for CR generation in the isotropic material. Fast electrons (e–) (dashed green arrow) can satisfy the wave-vector matching condition with two photonic states
Fig. 3. (a) Schematic of the integrated CR emitter and scanning electron microscopy images. The planar Mo electrodes is on the top surface of the emitter. The hyperbolic metamaterial in the middle is formed by alternating Au and SiO2 films. The plasmonic nanoslits under the emitter are used to couple the CR in the hyperbolic metamaterial to free space; (b) numerical simulation of CR (electric field
Fig. 4. (a) Measured surface plasmon resonance for various materials across the electromagnetic spectrum from terahertz to EUV; (b) schematic showing the
Fig. 5. (a) Schematic of the experimental configuration used to demonstrate backward CR and the photographic image of the negative index metamaterials; (b) the top and side view of the negative index metamaterials; (c) spectra of the radiation power in each angle in the negative band (solid line) and positive band (dashed line). (a) is extracted from Ref. [69]. (b), (c) are extracted from Ref. [68].
Fig. 6. (a) Schematic diagram of the constructed structure interacting with a single sheet electron beam bunch travelling along the +
Fig. 7. (a), (b) Fano-enhanced metallic metamaterials consisting of subwavelength slits with two different structural asymmetries; (c), (d) transmission results with different angles of incidence and structural asymmetries. The four sharp dips represent the excitation of the Fano resonance by capturing the p-polarized incident wave. Extracted from Ref. [77].
Fig. 8. (a) Schematic of free electrons flying over a silicon-on-insulator grating; (b) emission probability at a given frequency for different electron velocities, and strongly enhanced SPR near the BIC; (c) schematic of the normal impinging of a propagating plane wave upon a double silicon grating; (d) specular reflection coefficient
Fig. 9. (a) Schematic of the SPR produced by the interaction of free electrons and a Babinet metasurface. The uniform sheet of free electrons moves closely parallel to the metasurface along the +
Fig. 10. (a) Schematic of SPR mediated by graphene metasurfaces; (b) dependence of the SPR amplitude and phase on the width of the graphene ribbons; (c) dependence of the SPR phase on the displacement of a graphene ribbon in its unit cell for the second-order SPR; (d) dependence of the amplitude and phase of electric field
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Yue-Chai Lin, Fang Liu, Yi-Dong Huang.
Received: Feb. 22, 2020
Accepted: --
Published Online: Dec. 30, 2020
The Author Email: Huang Yi-Dong (yidonghuang@tsinghua.edu.cn)