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Three-dimensional array optical tweezers based on array phase modulation
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DOI：10.1016/j.optlastec.2025.112547.png)
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Abstract
En 中文
This study presents a method for generating a three-dimensional (3D) array of multifocal spots within a highnumerical aperture (NA) optical system without the influence of zero-order light is proposed, facilitating the creation of a 3D array optical tweezers system capable of trapping multiple particles simultaneously. By integrating a two-dimensional (2D) transverse multifocal spot array with a one-dimensional (1D) longitudinal multifocal spot array, a technique is proposed employing a continuous phase grating combined with an areadivided phase encoding method. This approach enables phase-only modulation to generate the desired 3D multifocal spots array with controllable intensity, representing significant progress for applications requiring high precision in particle manipulation. In the experimental demonstration, arrays of silica microspheres were successfully trapped and dynamically manipulate using the proposed multifocal spots array encoding. Specifically, a 3 x 3 x 3 array and a 5 x 5 array were stably trapped, and a 1 x 2 three-column array is dynamically manipulated, showcasing the system's capability to manipulate a large number of particles in a 3D configuration. The optical tweezers system presented herein holds great potential for applications in optical micromanipulation, microscopy, and the study of crystal materials. The experimental results validate the theoretical simulations and demonstrate the effectiveness of the 3D array optical tweezers system in achieving stable and precise particle capture.
Keywords:
Optical trapping
Phase modulation
Spatial light modulator
Three-dimensional array