Australian physicists have created a new artificial material that changes its structure, in response to light and other forms of radiation.
Unlike natural substances, it doesn’t have fixed physical properties. Under one set of circumstances it may be transparent, but then apply an electromagnetic force, it would compress and become less transparent. They are calling this material, “Magnetoelastic metamaterial” and it will respond to various levels of electromagnetic radiation, such as visible light or microwaves.
The material works by using a series of "split ring resonators" embedded in the material. Those resonators become attracted to each other compressing the material itself, after exposure to certain electromagnetic waves.
One example they say, is shining light on glass, it will allow most of the light through, then this mater can allow lower power light through, but high power light (brighter light) and the light passing through becomes diminished. We are bound to see many commercial applications of this technology in the future.