"Leftward"? Don't you mean Port? Top is Dorsal and Bottom is Ventral.
Also, The opposite of 450GHz == 450GHz, just half a phase ahead or back. This would only cancel out the shield where it hits, but not penetrate it. φ == φ would put it in phase, but potentially enhance the local strength.
I'd add ablative shielding to the list, ablative (physical shielding) vaporizes itself to dissipate the incoming energy away from the things it is trying to protect.