In fact, NASA is working to develop these as a way of sample collection for their rovers. And now scientists at the University of St. Andrews and the Institute of Scientific Instruments have developed a miniature tractor beam themselves.
Is the future now?
Michele Drier is the author of the paranormal romance series, The Kandesky Vampire Chronicles. The five books are available at Amazon and a boxed set of the first four novels is also available at B&N and Kobo. She also writes the Amy Hobbes Newspaper Mystries and is working on the second in the series, Labeled for Death.