On-chip optical tweezers based on freeform optics
Name
optica-8-3-409.pdf
Description
Published version
Size
8.31 MB
Format
Adobe PDF
Checksum (MD5)
d4fa8ef0dbc513b70ec3871eea5280d6
Author(s)
Yu, Shaoliang
Lu, Jinsheng
Ginis, Vincent
Kheifets, Simon
Lim, Soon Wei Daniel
Qiu, Min
Gu, Tian
Hu, Juejun
Capasso, Federico
Date Issued
2021
Journal
Optica
Publisher
The Optical Society
Citation
Yu, Shaoliang, Lu, Jinsheng, Ginis, Vincent, Kheifets, Simon, Lim, Soon Wei Daniel et al. 2021. "On-chip optical tweezers based on freeform optics." Optica, 8 (3).
Version
Final published version
Abstract
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Since its advent in the 1970s, optical tweezers have been widely deployed as a preferred non-contact technique for manipulating microscale objects. On-chip integrated optical tweezers, which afford significant size, weight, and cost benefits, have been implemented, relying upon near-field evanescent waves. As a result, these tweezers are only capable of manipulation in near-surface regions and often demand high power since the evanescent interactions are relatively weak. We introduce on-chip optical tweezers based on freeform micro-optics, which comprise optical reflectors or refractive lenses integrated on waveguide end facets via two-photon polymerization. The freeform optical design offers unprecedented degrees of freedom to design optical fields with strong three-dimensional intensity gradients, useful for trapping and manipulating suspended particles in an integrated chip-scale platform. We demonstrate the design, fabrication, and measurement of both reflective and refractive micro-optical tweezers. The reflective tweezers feature a remarkably low trapping threshold power, and the refractive tweezers are particularly useful for multiparticle trapping and interparticle interaction analysis. Our integrated micro-optical tweezers uniquely combine a compact footprint, broadband operation, high trapping efficiency, and scalable integration with planar photonic circuits. This class of tweezers is promising for on-chip sensing, cell assembly, particle dynamics analysis, and ion trapping.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
MIT Materials Research Laboratory
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DOI of Published Version
https://doi.org/10.1364/OPTICA.418837
