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Optical tweezers have been seen as an essential tool for manipulating dielectric microparticles and nanoparticles thanks to its non-contact action and high resolution of optical force. Up to now, there has been a lot of optical tweezers applications in the fields of biophysics, chemistry, medical science and nanoscience. Recently, optical tweezers have been theoretically and experimentally developed for the nano mechanical characterization of various kinds of biological cells. The configuration of optical tweezers has been day after day improved to enhance the trapping efficiency, spatial and temporal resolution as well as to ease the control of trapped objects. In common trend of optical tweezers improvements, we will discuss in detail several configurations of nonlinear optical tweezers using nonlinear materials as the added lens. We will also address the advantages of nonlinear optical tweezers, such as enhancement of optical efficiency, reduction of trapping region, and simplification in controlling all-optical method. Finally, we will present discussions about the specific properties of nonlinear optical tweezers used for stretch DNA molecule as example and an idea to improve nonlinear optical tweezers using thin layer of organic dye proposed for going time.

Nonlinear Optical Tweezers As an Optical Method for Controlling Particles with High Trap Efficiency