Boulder Nonlinear Systems Acquires Exclusive License of Holographic Optical Tweezers Patents August 30, 2014: Boulder Nonlinear Systems (BNS) is pleased to announce that it has acquired an exclusive license to the patents on holographic optical tweezers (HOT) held by the University of Chicago. Read more about Boulder Nonlinear Systems Acquires Exclusive License of Holographic Optical Tweezers Patents