This is huge because it has potential (hah) to become an ultra high speed photodetector, which have numerous uses in the industry. Conventional photodetectors

This is huge because it has potential (hah) to become an ultra high speed photodetector, which have numerous uses in the industry. Conventional photodetectors are essentially transparent photodiodes, and you have to pass a constant current through them for them to work, which generates heat and is generally a bad side effect. Antennas on the other hand are completely passive and therefore immune to heat related issues. Also, unlike photodiodes and semiconductor devices, antennas are completely linear. Nonlinearities cause distortion that limit usable bandwidth.