A team of physicists has shown that light with a negative frequency (thought to be a quirk of the equations) actually, in some sense, exists. The equations in question are Maxwell's, and they ...

In the case of a common 60-watt bulb, no more than a few percent of the total radiated energy is in the light-frequency range; most of the remainder is lost as heat. It would be far more efficient ...

Now, applied physicists at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have invented a new type of interferometer that allows precise control of light’s frequency, ...