(a) Angle of incidence at which the transmittance of each CSP is maximum as a function of cavity thickness. (b) Maximum transmittance at each CSP resonance peak as a function of cavity thickness, FTIR transmission at θ_co without Ag for comparison. (c) Modulus and (d) phase of r_LMH (lighter) and r_LM (darker) as functions of the incident angle. All results correspond to a setup using silver as metal (d_M = 39 nm), BK7 as prism and air filling the gap between the mirrors, at λ = 800 nm.