Simulated and predicted EAT frequencies, and simulated transmission efficiencies, for different deeply-subwavelength bridge lengths.
(a) Simulated EAT peak frequencies associated with the first five modes of a straight bridge as a function of the bridge length L (full lines), and compared to the analytical formula of Eq. (2) (dashed lines). Sim.: simulation. (b) Plot of the transmission efficiency η versus L. The condition η = 1 is indicated by a dashed line.