10^8 V/m, yeah that is quite a lot, 100V per micron or 1MV/cm. Even if it works it's going to have reliability issues, especially since the structures are not going to be perfect.

ignore the sibling comment by amelius

for a laser the intensity in the wavelength / frequency domain is very high, because it is coherent radiation

it just means you can use a (low power) laser to produce nonlinear optical effects.