Content-type: text/application/x-research-info-systems TY - JOUR AU - Gu, Min AU - Bao, Hongchun AU - Gan, Xiaosong AU - Stokes, Nicholas AU - Wu, Jingzhi TI - Tweezing and manipulating micro- and nanoparticles by optical nonlinear endoscopy JA - Light Sci Appl PY - 2014/01/03/online VL - 3 SP - e126 EP - PB - Changchun Institute of Optics, Fine Mechanics and Physics SN - UR - http://dx.doi.org/10.1038/lsa.2014.7 L3 - 10.1038/lsa.2014.7 M3 - Original Article KW - endoscopy KW - gold nanorods KW - micro/nanotweezing KW - two-photon absorption N1 - Supplementary information available for this article at http://www.nature.com/lsa/journal/v3/n1/suppinfo/lsa20147s1.html AB - The precise control and manipulation of micro- and nanoparticles using an optical endoscope are potentially important in biomedical studies, bedside diagnosis and treatment in an aquatic internal organ environment, but they have not yet been achieved. Here, for the first time, we demonstrate optical nonlinear endoscopic tweezers (ONETs) for directly controlling and manipulating aquatic micro- and nanobeads as well as gold nanorods. It is found that two-photon absorption can enhance the trapping force on fluorescent nanobeads by up to four orders of magnitude compared with dielectric nanobeads of the same size. More importantly, two-photon excitation leads to a plasmon-mediated optothermal attracting force on nanorods, which can extend far beyond the focal spot. This new phenomenon facilitates a snowball effect that allows the fast uploading of nanorods to a targeted cell followed by thermal treatment within 1 min. As two-photon absorption allows an operation wavelength at the center of the transmission window of human tissue, our work demonstrates that ONET is potentially an unprecedented tool for precisely specifying the location and dosage of drug particles and for rapidly uploading metallic nanoparticles to individual cancer cells for treatment. ER -