ABSTRACT: Conventional methods of manipulating particles with\u00a0light, such as optical tweezers and optical tractor beams, rely on beamshaping\u00a0to realize complex electromagnetic field profiles and are thus
\nsensitive to scattering. Here, we show that, by introducing tailored\u00a0optical asymmetry in the particle, we can realize a novel guiding\u00a0method that is controllable by the frequency of light, without regard to\u00a0the direction or the shape of the light beam. With detailed stochastic\u00a0simulations, we demonstrate guiding of a two-faced nanoparticle where\u00a0the optically induced thermophoretic drift serves as the propulsion\u00a0mechanism. Exploiting the difference in resonant absorption spectra of\u00a0the two materials, we create a bidirectional local thermal gradient that is externally switchable. This is advantageous because the\u00a0frequency of a light beam, unlike its shape or coherence, is preserved even in strongly scattering environments. Since this\u00a0approach is insensitive to scattering and applicable to many particles at once, as well as particles that cannot be optically resolved,\u00a0it may enable useful applications in biology, microfluidics, in vivo tasks, and colloidal science.<\/p>\n
O. Ilic, I. Kaminer, Y. Lahini, H. Buljan, M. Soljac\u030ci\u0107, Exploiting Optical Asymmetry for Controlled Guiding of Particles with Light, ACS Photonics 3, 197 (2016).<\/p>\n
http:\/\/pubs.acs.org\/doi\/abs\/10.1021\/acsphotonics.5b00605<\/a><\/p>","protected":false},"excerpt":{"rendered":" ABSTRACT: Conventional methods of manipulating particles with\u00a0light, such as optical tweezers and optical tractor beams, rely on beamshaping\u00a0to realize complex electromagnetic field profiles and are thus sensitive to scattering. Here, we show that, by introducing tailored\u00a0optical asymmetry in the particle, we can realize a novel guiding\u00a0method that is controllable by […]<\/a><\/p>\n<\/div>","protected":false},"author":2,"featured_media":335,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[12,5],"tags":[],"_links":{"self":[{"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/posts\/334"}],"collection":[{"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/comments?post=334"}],"version-history":[{"count":3,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/posts\/334\/revisions"}],"predecessor-version":[{"id":342,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/posts\/334\/revisions\/342"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/media\/335"}],"wp:attachment":[{"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/media?parent=334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/categories?post=334"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bela.phy.hr\/quantixlie\/wp-json\/wp\/v2\/tags?post=334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}