On-chip cascaded tapered waveguides for optical trapping of microparticles

Weichao Cheng; Zhi Cheng; Xuedi Wang; Xin Tong; Lin Zhang

doi:10.1117/12.2691080

12 March 2024 On-chip cascaded tapered waveguides for optical trapping of microparticles

Weichao Cheng, Zhi Cheng, Xuedi Wang, Xin Tong, Lin Zhang

Proceedings Volume 12846, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues XXII; 128460D (2024) https://doi.org/10.1117/12.2691080
Event: SPIE BiOS, 2024, San Francisco, California, United States

Conference Poster

Abstract

Near-field optical tweezers on a chip based on silicon-on-insulator (SOI) platform have drawn significant attention as prominent particle manipulation tools in chemistry, biology, and materials science. In this work, we demonstrate a lowloss tapered silicon waveguide with a high intensity gradient to trap microparticles. The high transmittance of this waveguide makes it easy to cascade many traps along the direction of light propagation. Optical forces in all three dimensions are analyzed using an in-house modeling toolkit. Experimentally, an integrated waveguide-based optical tweezer with a cascade of five trapping units is fabricated by electron beam lithography and reactive ion etching. Yeast cells are successfully trapped at different trapping units in the cascaded tapered waveguide using only around 20 mW of optical power at 1550-nm wavelength. We believe that the proposed scheme exhibits great potential for applications in biological analysis and optical detection.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Weichao Cheng, Zhi Cheng, Xuedi Wang, Xin Tong, and Lin Zhang "On-chip cascaded tapered waveguides for optical trapping of microparticles", Proc. SPIE 12846, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues XXII, 128460D (12 March 2024); https://doi.org/10.1117/12.2691080

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