No derision here.
Well, that's not a terible idea, but it can't exist within the framework of modern physics. This is partially because matter does have a wavelength similar to the electromagnetic wavelength of particles. The DeBroglie wavelength defines the wavelength of quanta (particle with or without mass). The difference between electrons (for instance) and x-rays is more fundamental. String Theory has made progress in explaining why this is so, put it remains as of yet, unproven.