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Interactive light-driven and parallel manipulation of inhomogeneous particles

Peter John Rodrigo, René Lynge Eriksen, Vincent Ricardo Daria, and Jesper Glückstad

Open Access Open Access

Abstract

A light-driven micromanipulation system with real-time user-feedback control is used to simultaneously trap colloidal suspensions enabling a unique interactive sorting capability and arbitrary patterning of microscopic particles. The technique is based on a straightforward phase-to-intensity conversion generating multiple beam patterns for manipulation of particles in the observation plane of a microscope. Encoding of phase patterns in a spatial light modulator, which is directly controlled by a computer, allows for dynamic reconfiguration of the trapping patterns, where independent control of the position, size, shape and intensity of each beam is possible. Efficient sorting of microsphere mixtures of distinct sizes and colors using multiple optical traps is demonstrated.

©2002 Optical Society of America

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Supplementary Material (3)

Media 1: MPG (2851 KB)     
Media 2: MPG (2104 KB)     
Media 3: MPG (3531 KB)     

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Figures (5)
Fig. 1.
Fig. 1. (a) Schematic diagram of the experimental setup for implementing interactive optical manipulation of a colloidal suspension. (b) Different geometries of multiple trapping beams. (c) 10 × 10 array of annular beams for trapping of particles with refractive indices lower than that of the surrounding medium. (d) Asymmetric array of 15 × 15 traps with two distinct beam diameters. SLM phase modulation of 0 and π correspond to minimum and maximum intensity, respectively.

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Fig. 2.
Fig. 2. (MPEG, 2919 KB) Non-mechanical removal of microsphere stacking. (a) Blurred image of the topmost microsphere (5μm-diameter) indicating the presence of another particle trapped underneath. Inset: the topmost beam that trapped more than one particle has been selected by the computer “mouse” pointer. (b) Movement of the selected graphic in the directions indicated by the arrows resulting to transverse translation of the specific trapping beam. (c) Introduction of an additional trapping beam. Inset shows the graphic corresponding to the new beam positioned at the site of the ejected particle (2-μm-diameter). (d) The final configuration with an array of distinguishable particles and with one particle per trapping beam. Scale bar, 10 μm.

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Fig. 3.
Fig. 3. (MPEG, 2,154 KB) Image sequences of trapping and sorting of inhomogeneous size mixture of polystyrene beads in water solution with < 1% surfactant. (a) Dispersed beads with diameters 2 μm and 5 μm are first captured by corresponding trapping beams. The beads are held just below the upper surface of the glass chamber. The size of the beam used at each trapping site is proportional to the size of the trapped particle. (b – d) Sorting of the beads according to size. Scale bar, 10 μm.

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Fig. 4.
Fig. 4. (MPEG, 3616KB) Trapping and sorting of inhomogeneous mixture of commercially dyed polystyrene beads. All beads have a diameter of 3 μm. With the mouse-controlled movement of the corresponding trapping beams, the beads are assembled into a 3 × 3 array and subsequently segregated according to color. Scale bar, 10 μm.

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Fig. 5.
Fig. 5. A graphic demonstrating an interactive light-driven ‘lab-on-a-chip’ with multiple functionalities simultaneously programmed by a computer. It enables the user to assemble structures and control the sorting capability of light-driven pumps and valves inside the prefabricated channels of the chip. A mesh intensity pattern guides a network of particles at the topmost compartment to assemble colloidal crystal while hollow beams trap low-index particles at the middle compartment.

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