Yes. It's the same principle that is used in both microwave and audio anechoic chambers. The pyramidal spikes on the walls [1] of an anechoic chamber are much

Yes. It's the same principle that is used in both microwave and audio anechoic chambers. The pyramidal spikes on the walls [1] of an anechoic chamber are much bigger equivalents of the nanotube spikes being used for light. [1] https://upload.wikimedia.org/wikipedia/commons/0/0a/Radio-frequency-anechoic-chamber-HDR-0a.jpg https://upload.wikimedia.org/wikipedia/commons/0/0a/Radio-fr...