Tunable terahertz plasmon in grating-gate coupled graphene with a resonant cavity<xref ref-type="fn" rid="cpb142016fn1">*</xref>

Tunable terahertz plasmon in grating-gate coupled graphene with a resonant cavity*

Yan Bo^a),^b), Yang Xin-Xin^b), Fang Jing-Yue^a), Huang Yong-Dan^b), Qin Hua^b), Qin Shi-Qiao^c)

Fig.#cod#x00A0;1. a Schematic diagram of the proposed device that combines a grating coupled graphene with a Fabry#cod#x2013;P#cod#x00E9;rot cavity. b The frequency of the basic graphene plasmon mode as a function of the top-gate voltage. The inset shows the real part #cod#x03B5; #cod#x2032;, black dash line and the imaginary part #cod#x03B5; #cod#x2033;, red solid line of a bare graphene sheet with W #cod#x003D; 3#cod#x00A0;#cod#x03BC;m at V G #cod#x003D; #cod#x00B1;2.67#cod#x00A0;V, corresponding to a charge density of 4.69 #cod#x00D7; 10 12 #cod#x00A0;cm #cod#x2212;2 .