Phototaxis of synthetic microswimmers in optical landscapes.
Many microorganisms, with phytoplankton and zooplankton as prominent examples, display phototactic behaviour, that is, the ability to perform directed motion within a light gradient. Here we experimentally demonstrate that sensing of light gradients can also be achieved in a system of synthetic photo-activated microparticles being exposed to an inhomogeneous laser field. We observe a strong orientational response of the particles because of diffusiophoretic torques, which in combination with an intensity-dependent particle motility eventually leads to phototaxis. Since the aligning torques saturate at high gradients, a strongly rectified particle motion is found even in periodic asymmetric intensity landscapes. Our results are in excellent agreement with numerical simulations of a minimal model and should similarly apply to other particle propulsion mechanisms. Because light fields can be easily adjusted in space and time, this also allows to extend our approach to dynamical environments.
2. Physikalisches Institut, Universität Stuttgart, D-70569 Stuttgart, Germany.|Max-Planck-Institut für Intelligente Systeme, D-70569 Stuttgart, Germany.
Celia
C
Lozano
Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Borge
B
Ten Hagen
Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Hartmut
H
Löwen
2. Physikalisches Institut, Universität Stuttgart, D-70569 Stuttgart, Germany.|Max-Planck-Institut für Intelligente Systeme, D-70569 Stuttgart, Germany.
Clemens
C
Bechinger
Proc Natl Acad Sci U S A. 2015 Jun 2;112(22):7045-50
25964338
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Jul;92(1):012304
26274159
Annu Rev Fluid Mech. 2015 Jan 1;47:343-375
26594068
Phys Rev Lett. 2008 Jul 4;101(1):018102
18764155
Nat Commun. 2014 Sep 19;5:4829
25234416
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jun;89(6):062316
25019785
Phys Rev Lett. 2016 Apr 1;116(13):138301
27082004
Phys Rev Lett. 2011 Jan 28;106(4):048102
21405365
Nature. 2005 Oct 6;437(7060):862-5
16208366
Sci Adv. 2015 May 01;1(4):e1400214
26601175
Biophys J. 2000 Mar;78(3):1207-15
10692310
Methods Mol Biol. 2009;571:25-49
19763957
Phys Rev Lett. 2015 Jul 10;115(2):028301
26207507
Phys Rev Lett. 2013 Jun 7;110(23):238301
25167534
J Phys Condens Matter. 2011 May 18;23(19):194119
21525563
Phys Rev Lett. 2010 Apr 2;104(13):138302
20481918
Phys Rev Lett. 2014 Jun 13;112(23):238303
24972234
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Feb;85(2 Pt 1):020401
22463141
Phys Rev Lett. 2015 Dec 18;115(25):258301
26722949
Phys Rev Lett. 1995 Aug 7;75(6):1226-1229
10060237
Nature. 2005 Nov 24;438(7067):504-7
16306993
Phys Rev Lett. 2012 Jan 20;108(3):038303
22400792
Phys Rev Lett. 2010 Dec 31;105(26):268302
21231718
J Am Chem Soc. 2004 Oct 20;126(41):13424-31
15479099
Nat Commun. 2015 Dec 02;6:8999
26627125
Rep Prog Phys. 2015 May;78(5):056601
25919479
Rep Prog Phys. 2012 Apr;75(4):042601
22790505
Nat Commun. 2015 Aug 17;6:7985
26278469
Phys Rev Lett. 2012 Oct 19;109(16):168101
23215133
Proc Natl Acad Sci U S A. 2010 May 25;107(21):9541-5
20457936
Nature. 2008 Nov 20;456(7220):395-9
19020621
Phys Rev Lett. 2015 Oct 30;115(18):188304
26565507
Phys Rev Lett. 2015 Oct 30;115(18):188305
26565508
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jul;88(1):012301
23944457
Chemistry. 2005 Nov 4;11(22):6462-70
16052651
Nature. 1972 Oct 27;239(5374):500-4
4563019
Phys Rev Lett. 2012 Jun 29;108(26):268303
23005020
J Phys Condens Matter. 2012 Jul 18;24(28):284129
22739052
Soft Matter. 2014 Jun 14;10(22):4016-27
24759904
Colloids Surf B Biointerfaces. 2016 Jan 1;137:2-16
26310235
Phys Rev Lett. 2007 Oct 26;99(17):178103
17995374
J R Soc Interface. 2015 Mar 6;12(104):20141164
25589576
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Dec;88(6):062310
24483447
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Jul;92(1):012114
26274132
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 May;89(5):050303
25353729
J Bacteriol. 2007 Dec;189(23):8704-7
17890308
Science. 2013 Feb 22;339(6122):936-40
23371555
Science. 2009 Feb 20;323(5917):1067-70
19229037
Phys Rev Lett. 2014 Feb 14;112(6):068302
24580713
Phys Rev Lett. 2007 Jul 27;99(4):048102
17678409
Sci Adv. 2016 Apr 01;2(4):e1501850
27051883