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. 2015 Nov 20;5:16926. doi: 10.1038/srep16926

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(a) x-y uniform intensity profile within the superposition region of two opposite circularly polarized beam and polarization spatial distribution. The polarization pattern has a spatial periodicity smaller than the particle size, in experiment the value of Λ is about 5 μm (see Methods), ensuring the condition of all linear polarization states impinging on the particle; (b) x-y uniform intensity profile within the superposition region of two orthogonal linearly polarized beams and polarization spatial distribution; (c) x-z plane showing the superposition area of the beams with a 20 μm spot size, the longitudinal region of superposition is larger than the particle size, in the present case about 80 μm.