Is there any process or device that will allow a transmission of an EM wave of a certain amplitude (say 2) but will block transmission of a lesser amplitude (say 1), such that an EM wave of a given amplitude of blocked, but a EM wave with 2x the amplitude will pass thru (even if that amplitude is reduced/modulated in the process)? For example, what if we have a material which absorbs light. Increased amplitude means a larger number of photons. If we make the material a small enough quantity such that it absorbs all the photons of the lesser-amplitude wave (amp of 1), but when a higher amplitude wave (amp of 2), which has more photons, will be transmitted b.c there aren't enough atoms in the sample to absorb all the photons of that larger-amplitude wave. Is this feasible? Is there anything wrong with my thinking here? Also, are there any other processes/devices which could accomplish this (block waves of a certain amplitude, but allow transmission of a wave with a larger amplitude)?