The unanswered question
How easily can this be mounted on a shark?
NASA has awarded a $100,000 grant to three boffins who are investigating a tractor beam trifecta. Principal Investigator Paul Stysley and team members Demetrios Poulios and Barry Coyle at NASA's Goddard Space Flight Center received the grant to research three methods of using lasers to collect particulate samples without the …
"Though a mainstay in science fiction, and Star Trek in particular, laser-based trapping ...."
Star Trek tractor beams use a subspace/graviton interference pattern for their effect. I'm surprised that a scientist working in this field wasn't aware of that.
The system that is used by a Flying Saucer (the technology was discovered, patented and rejected by Nasa, as it would make the Rockt Industry obsolete) would be able to send a beam and attract or repel a mass. Probably too advanced for Nasa scientists but High School kids would understand it. Look at One Terminal Capacitor,