Dynamic axial control over optically levitating particles in air with an electrically-tunable variable-focus lens

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dc.contributor.authorZhu, W.
dc.contributor.authorEckerskorn, N.
dc.contributor.authorUpadhya, A.
dc.contributor.authorLi, L.
dc.contributor.authorRode, A.V.
dc.contributor.authorLee, W.M.
dc.date.issued2016
dc.description.abstractEfficient delivery of viruses, proteins and biological macromelecules into a micrometer-sized focal spot of an XFEL beam for coherent diffraction imaging inspired new development in touch-free particle injection methods in gaseous and vacuum environments. This paper lays out our ongoing effort in constructing an all-optical particle delivery approach that uses piconewton photophoretic and femtonewton light-pressure forces to control particle delivery into the XFEL beam. We combine a spatial light modulator (SLM) and an electrically tunable lens (ETL) to construct a variable-divergence vortex beam providing dynamic and stable positioning of levitated micrometer-size particles, under normal atmospheric pressure. A sensorless wavefront correction approach is used to reduce optical aberrations to generate a high quality vortex beam for particle manipulation. As a proof of concept, stable manipulation of optically-controlled axial motion of trapped particles is demonstrated with a response time of 100ms. In addition, modulation of trapping intensity provides a measure of the mass of a single, isolated particle. The driving signal of this oscillatory motion can potentially be phase-locked to an external timing signal enabling synchronization of particle delivery into the x-ray focus with XFEL pulse train.
dc.description.statementofresponsibilityWenguo Zhu, Niko Eckerskorn, Avinash Upadhya, Li Li, Andrei V. Rode, and Woei Ming Lee
dc.identifier.citationBiomedical Optics Express, 2016; 7(7):2902-2911
dc.identifier.doi10.1364/BOE.7.002902
dc.identifier.issn2156-7085
dc.identifier.issn2156-7085
dc.identifier.orcidUpadhya, A. [0000-0003-0841-303X]
dc.identifier.urihttps://hdl.handle.net/2440/138396
dc.language.isoen
dc.publisherOptical Society of America
dc.relation.granthttp://purl.org/au-research/grants/arc/DP110100975
dc.relation.granthttp://purl.org/au-research/grants/arc/DE160100843
dc.rights©2016 Optical Society of America. Open Access (CC BY 4.0)
dc.source.urihttps://doi.org/10.1364/boe.7.002902
dc.subject(140.7010) Laser trapping
dc.subject(350.4855) Optical tweezers or optical manipulation
dc.titleDynamic axial control over optically levitating particles in air with an electrically-tunable variable-focus lens
dc.typeJournal article
pubs.publication-statusPublished

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