Even though the antilaser absorbs perfectly, it does so only at specific wavelengths of light... That would make it more than an optical switch, which switches

Even though the antilaser absorbs perfectly, it does so only at specific wavelengths of light... That would make it more than an optical switch, which switches broad bandwidths of light on or off. This implies that it is a perfect "notch" filter (absorbs only a specific frequency/wavelength) that can also be turned on and off. Notch filters are very important in communications technology. Being able to turn a perfect notch filter on and off is very interesting. Modulation of light (lasers) is an obvious potential application, especially if it can be done very rapidly - direct modulation of lasers is somewhat tricky. http://www.molphys.leidenuniv.nl/~thooft/laserweb/download/laser_modulation.htm http://www.molphys.leidenuniv.nl/~thooft/laserweb/download/l... ...of course, they have to build one first.