A team of researchers from Japan and Germany have proposed a new way to detect gravitational waves in the frequency band 1 mHz to 1Hz. The principle of this new "torsion-bar antenna" (TOBA) is that, when gravitational waves pass through this antenna, tidal forces by the gravitational waves will appear as differential angular changes in the two orthogonal bars constituting the antenna. These changes are extracted using a laser interferometer. The authors argue that the potential sensitivity of this antenna is superior to those of current detectors in a 1 mHz-10 Hz frequency band.

Further reading:

• Physical Review Letters article.
• "Cheap and cheerful gravity wave detector on the horizon", News item in ARS technica