Photonics Research, 2017, 5 (4): 04000377, Published Online: Jan. 21, 2019
Multiple resonant excitations of surface plasmons in a graphene stratified slab by Otto configuration and their independent tuning 
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Fig. 1. Schematic of the proposed graphene stratified slab cladded by the prism and another semi-infinite dielectric medium. Double GSP resonances can be excited by Otto configuration under TM-wave incidence.
Fig. 2. (a) Optical responses of the proposed graphene stratified slab with respect to the incident angle θ f = 1 THz n p − n 1 n 1 − n 2 n 2 − n a z θ z < 0 n p − n 1 z = 0
Fig. 3. (a) Angular reflection spectra with various Fermi levels on each graphene layer. The black dotted line indicates the independence of resonant excitation I on Fermi level E FB E FA f = 3 THz τ = 1 ps
Fig. 4. (a) Dependence of resonant angles on their corresponding Fermi level. Theoretically estimated results are also presented. (b) Dependence of FWHMs and FHs of both resonances on the corresponding Fermi level.
Fig. 5. Dependence of the resonant angle and FH on (a) the refractive index and (b) the thickness of dielectric layer 1. Both resonant excitations are presented.
Fig. 6. Dependence of the resonant angle and FH on (a) the refractive index and (b) the thickness of dielectric layer 2. Both resonant excitations are presented.
Fig. 7. (a) Angular reflection spectrum with triple resonant excitations. The inset shows the schematic of the graphene stratified slab with three graphene sheets. (b) Electric field distributions of triple resonant excitations. Light is selectively coupled into three different GSP modes by varying the incident angle. The white solid lines denote the three graphene sheets placed at the interfaces of the dielectric layers. The prism occupies the region z < 0
Fig. 8. (a) Angular reflection spectra with various Fermi levels on each graphene layer. The black dot-dashed, dotted, and dashed lines indicate the starting resonant angles of the three GSP modes with E FA = E FB = E FC = 0.30 eV
Fig. 9. Validation of (a) angular spectra and (b) electromagnetic distributions comparing results obtained by the TMM-SCBC method and by commercial software COMSOL Multiphysics. An SCBC boundary condition is also employed in the COMSOL simulation. Markers are specific data points to better demonstrate the comparison.
Jin Yao, Ying Chen, Longfang Ye, Na Liu, Guoxiong Cai, Qing Huo Liu. Multiple resonant excitations of surface plasmons in a graphene stratified slab by Otto configuration and their independent tuning[J]. Photonics Research, 2017, 5(4): 04000377.
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