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We explore a number of diffractive structures for simultaneous trapping of particles in photophoretic traps for free space volumetric displays. Current optical trap displays move a single particle along a complicated path; to scale displays from 1 cm^3 to 100 cm^3 we aim to move multiple particles along a simple path. Preliminary results for two diffractive approaches are reported: i) a low-order binary grating, and ii) a Fresnel lens. Results are given for trap rate (N=50) for carbon particles at standard pressure and temperature.
Cooper D. Bond,Riley Kuttler,Christian M. Hales, andDaniel E. Smalley
"Diffractive optics for scaling photophoretic trap displays", Proc. SPIE 12445, Practical Holography XXXVII: Displays, Materials, and Applications, 124450I (8 March 2023); https://doi.org/10.1117/12.2655275
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Cooper D. Bond, Riley Kuttler, Christian M. Hales, Daniel E. Smalley, "Diffractive optics for scaling photophoretic trap displays," Proc. SPIE 12445, Practical Holography XXXVII: Displays, Materials, and Applications, 124450I (8 March 2023); https://doi.org/10.1117/12.2655275