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Holographic optical tweezers can be applied to manipulate microscopicparticles in arbitrary optical patterns, which classical optical tweezerscannot do. This ability relies on accurate computer-generated holography (CGH),yet most CGH techniques can only shape the intensity profiles while the phasedistributions are random. Here, we introduce a new method for fast generationof holograms that allows for simultaneously shaping both the intensity andphase distributions of light. The method uses a discrete inverse Fouriertransform formula to directly calculate a hologram in one step, in which arandom phase factor is introduced into the formula to enable simultaneouscontrol of intensity and phase. Various optical patterns can be created, asdemonstrated by the experimentally measured intensity and phase profilesprojected from the holograms. The simultaneous shaping of intensity and phaseof light provides new opportunities for optical trapping and manipulation, suchas optical transportation of metal nanoparticles in ring traps with linear andnonlinear phase distributions.

Simultaneously shaping the intensity and phase of light for optical nanomanipulation