Abstract

We present an experimental analysis of different equilibrium orientations and light driven transformations of Janus particles in the nematic liquid crystal 5CB. Depending on the preparation technique of homeotropic (DMOAP) and planar (Au) hemispheres we have observed two types of director field configurations: dipolar-like in the case of Au/DMOAP capped colloids and boojum-like in the case of DMOAP/Au capped colloids. Using the manipulation of Au/DMOAP capped colloids with laser tweezers we report on light driven irreversible orientational transformations into Saturn-ring and a novel, boojum-ring configuration. On the contrary, boojum-like DMOAP/Au capped colloids can act as rotators when exposed to the laser filed. Observed rotation is continuous around an axis perpendicular to the laser beam axis, with the frequency increasing linearly with the laser power.

© 2010 OSA

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  1. P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
    [CrossRef] [PubMed]
  2. M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
    [CrossRef] [PubMed]
  3. I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
    [CrossRef] [PubMed]
  4. P. Poulin and D. A. Weitz, “Inverted and multiple nematic emulsions,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 57(1), 626–637 (1998).
    [CrossRef]
  5. J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
    [CrossRef] [PubMed]
  6. V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
    [CrossRef] [PubMed]
  7. P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
    [CrossRef]
  8. I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
    [CrossRef] [PubMed]
  9. Y. Iwashita and H. Tanaka, “Optical manipulation of defects in a lyotropic lamellar phase,” Phys. Rev. Lett. 90(4), 045501–045504 (2003).
    [CrossRef] [PubMed]
  10. I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
    [CrossRef]
  11. A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
    [CrossRef]
  12. I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
    [CrossRef] [PubMed]
  13. R. Beth, “Mechanical detection and measurement of the angular momentum of light,” Phys. Rev. 50(2), 115–125 (1936).
    [CrossRef]
  14. N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation based on a light-induced molecular reordering,” Opt. Express 14(6), 2481–2486 (2006).
    [CrossRef] [PubMed]
  15. N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
    [CrossRef] [PubMed]
  16. L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
    [CrossRef] [PubMed]
  17. L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
    [CrossRef] [PubMed]
  18. F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
    [CrossRef]
  19. P. Galajda and P. Ormos, “Complex micromachines produced and driven by light,” Appl. Phys. Lett. 78(2), 249–251 (2001).
    [CrossRef]
  20. E. Higurashi, R. Sawada, and T. Ito, “Optically induced rotation of a trapped micro-object about an axis perpendicular to the laser beam axis,” Appl. Phys. Lett. 72(23), 2951–2953 (1998).
    [CrossRef]
  21. M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
    [CrossRef]

2009 (1)

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

2007 (1)

L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
[CrossRef] [PubMed]

2006 (5)

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
[CrossRef]

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation based on a light-induced molecular reordering,” Opt. Express 14(6), 2481–2486 (2006).
[CrossRef] [PubMed]

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
[CrossRef] [PubMed]

2005 (2)

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
[CrossRef]

2004 (3)

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
[CrossRef]

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
[CrossRef] [PubMed]

2003 (1)

Y. Iwashita and H. Tanaka, “Optical manipulation of defects in a lyotropic lamellar phase,” Phys. Rev. Lett. 90(4), 045501–045504 (2003).
[CrossRef] [PubMed]

2002 (1)

P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
[CrossRef]

2001 (2)

V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
[CrossRef] [PubMed]

P. Galajda and P. Ormos, “Complex micromachines produced and driven by light,” Appl. Phys. Lett. 78(2), 249–251 (2001).
[CrossRef]

2000 (1)

J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
[CrossRef] [PubMed]

1998 (2)

P. Poulin and D. A. Weitz, “Inverted and multiple nematic emulsions,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 57(1), 626–637 (1998).
[CrossRef]

E. Higurashi, R. Sawada, and T. Ito, “Optically induced rotation of a trapped micro-object about an axis perpendicular to the laser beam axis,” Appl. Phys. Lett. 72(23), 2951–2953 (1998).
[CrossRef]

1997 (1)

P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
[CrossRef] [PubMed]

1936 (1)

R. Beth, “Mechanical detection and measurement of the angular momentum of light,” Phys. Rev. 50(2), 115–125 (1936).
[CrossRef]

Babic, D.

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Baraban, L.

L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
[CrossRef] [PubMed]

Barois, P.

J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
[CrossRef] [PubMed]

Bele, M.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

Beth, R.

R. Beth, “Mechanical detection and measurement of the angular momentum of light,” Phys. Rev. 50(2), 115–125 (1936).
[CrossRef]

Cacciuto, A.

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

Clark, N. A.

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
[CrossRef]

Cluzeau, P.

P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
[CrossRef]

Conradi, M.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

Dolganov, V. K.

P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
[CrossRef]

Erbe, A.

L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
[CrossRef] [PubMed]

F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
[CrossRef]

Galajda, P.

P. Galajda and P. Ormos, “Complex micromachines produced and driven by light,” Appl. Phys. Lett. 78(2), 249–251 (2001).
[CrossRef]

Granick, S.

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

Higurashi, E.

E. Higurashi, R. Sawada, and T. Ito, “Optically induced rotation of a trapped micro-object about an axis perpendicular to the laser beam axis,” Appl. Phys. Lett. 72(23), 2951–2953 (1998).
[CrossRef]

Hong, L.

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

Ito, T.

E. Higurashi, R. Sawada, and T. Ito, “Optically induced rotation of a trapped micro-object about an axis perpendicular to the laser beam axis,” Appl. Phys. Lett. 72(23), 2951–2953 (1998).
[CrossRef]

Iwashita, Y.

Y. Iwashita and H. Tanaka, “Optical manipulation of defects in a lyotropic lamellar phase,” Phys. Rev. Lett. 90(4), 045501–045504 (2003).
[CrossRef] [PubMed]

Joly, G.

P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
[CrossRef]

Juodkazis, S.

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation based on a light-induced molecular reordering,” Opt. Express 14(6), 2481–2486 (2006).
[CrossRef] [PubMed]

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
[CrossRef] [PubMed]

Kachynski, A. V.

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
[CrossRef]

Kuzmin, A. N.

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
[CrossRef]

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

Lavrentovich, O. D.

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
[CrossRef]

Leiderer, P.

L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
[CrossRef] [PubMed]

F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
[CrossRef]

Lev, B. I.

V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
[CrossRef] [PubMed]

Loudet, J.-C.

J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
[CrossRef] [PubMed]

Lubensky, T. C.

P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
[CrossRef] [PubMed]

Luijten, E.

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

Maclennan, J. E.

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
[CrossRef]

Merkt, F. S.

F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
[CrossRef]

Misawa, H.

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation based on a light-induced molecular reordering,” Opt. Express 14(6), 2481–2486 (2006).
[CrossRef] [PubMed]

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
[CrossRef] [PubMed]

Murazawa, N.

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
[CrossRef] [PubMed]

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation based on a light-induced molecular reordering,” Opt. Express 14(6), 2481–2486 (2006).
[CrossRef] [PubMed]

Muševic, I.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Nazarenko, V.

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Nazarenko, V. G.

V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
[CrossRef] [PubMed]

Nguyen, H. T.

P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
[CrossRef]

Nych, A.

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Nych, A. B.

V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
[CrossRef] [PubMed]

Ormos, P.

P. Galajda and P. Ormos, “Complex micromachines produced and driven by light,” Appl. Phys. Lett. 78(2), 249–251 (2001).
[CrossRef]

Osterman, N.

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Park, C. S.

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
[CrossRef]

Pattanaporkratana, A.

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
[CrossRef]

Poberaj, I.

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Poulin, P.

J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
[CrossRef] [PubMed]

P. Poulin and D. A. Weitz, “Inverted and multiple nematic emulsions,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 57(1), 626–637 (1998).
[CrossRef]

P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
[CrossRef] [PubMed]

Prasad, P. N.

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
[CrossRef]

Ravnik, M.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

Sawada, R.

E. Higurashi, R. Sawada, and T. Ito, “Optically induced rotation of a trapped micro-object about an axis perpendicular to the laser beam axis,” Appl. Phys. Lett. 72(23), 2951–2953 (1998).
[CrossRef]

Škarabot, M.

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Smalyukh, I. I.

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
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Stark, H.

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[CrossRef] [PubMed]

Tanaka, H.

Y. Iwashita and H. Tanaka, “Optical manipulation of defects in a lyotropic lamellar phase,” Phys. Rev. Lett. 90(4), 045501–045504 (2003).
[CrossRef] [PubMed]

Tkalec, U.

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

Weitz, D. A.

P. Poulin and D. A. Weitz, “Inverted and multiple nematic emulsions,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 57(1), 626–637 (1998).
[CrossRef]

P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
[CrossRef] [PubMed]

Yada, M.

M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
[CrossRef] [PubMed]

Yamamoto, J.

M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
[CrossRef] [PubMed]

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M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
[CrossRef] [PubMed]

Zorko, M.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

Žumer, S.

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

Appl. Phys. Lett. (3)

I. I. Smalyukh, A. N. Kuzmin, A. V. Kachynski, P. N. Prasad, and O. D. Lavrentovich, “Optical trapping of colloidal particles and measurement of the deect line tension and colloidal forces in a thermotropic nematic liquid crystal,” Appl. Phys. Lett. 86(2), 021913–021916 (2005).
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Eur Phys J E Soft Matter (2)

N. Murazawa, S. Juodkazis, and H. Misawa, “Laser manipulation of a smectic liquid-crystal droplet,” Eur Phys J E Soft Matter 20(4), 435–439 (2006).
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L. Baraban, A. Erbe, and P. Leiderer, “Characterization of magnetic colloids by means of magnetooptics,” Eur Phys J E Soft Matter 23(1), 129–133 (2007).
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Ferroelectrics (1)

A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, “Manipulation of disk-shaped islands and direct measurement of dipolar elastic interaction forces between islands on freely suspended smectic films using multiple optical tweezers,” Ferroelectrics 310(1), 131–135 (2004).
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P. Cluzeau, G. Joly, H. T. Nguyen, and V. K. Dolganov, “Two-dimensional ordering of inclusions in smectic C phase,” JETP Lett. 75(9), 482–486 (2002).
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N. J. Phys. (1)

F. S. Merkt, A. Erbe, and P. Leiderer, “Capped colloids as light-mills in optical traps,” N. J. Phys. 8(9), 216–224 (2006).
[CrossRef]

Nano Lett. (1)

L. Hong, A. Cacciuto, E. Luijten, and S. Granick, “Clusters of charged Janus spheres,” Nano Lett. 6(11), 2510–2514 (2006).
[CrossRef] [PubMed]

Nature (1)

J.-C. Loudet, P. Barois, and P. Poulin, “Colloidal ordering from phase separation in a liquid-crystalline continuous phase,” Nature 407(6804), 611–613 (2000).
[CrossRef] [PubMed]

Opt. Express (1)

Phys. Rev. (1)

R. Beth, “Mechanical detection and measurement of the angular momentum of light,” Phys. Rev. 50(2), 115–125 (1936).
[CrossRef]

Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics (1)

P. Poulin and D. A. Weitz, “Inverted and multiple nematic emulsions,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 57(1), 626–637 (1998).
[CrossRef]

Phys. Rev. Lett. (5)

M. Yada, J. Yamamoto, and H. Yokoyama, “Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers,” Phys. Rev. Lett. 92(18), 185501–185504 (2004).
[CrossRef] [PubMed]

I. I. Smalyukh, O. D. Lavrentovich, A. N. Kuzmin, A. V. Kachynski, and P. N. Prasad, “Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal,” Phys. Rev. Lett. 95(15), 157801–157804 (2005).
[CrossRef] [PubMed]

V. G. Nazarenko, A. B. Nych, and B. I. Lev, “Crystal structure in nematic emulsion,” Phys. Rev. Lett. 87(7), 075504–075508 (2001).
[CrossRef] [PubMed]

Y. Iwashita and H. Tanaka, “Optical manipulation of defects in a lyotropic lamellar phase,” Phys. Rev. Lett. 90(4), 045501–045504 (2003).
[CrossRef] [PubMed]

I. Muševič, M. Škarabot, D. Babič, N. Osterman, I. Poberaj, V. Nazarenko, and A. Nych, “Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts,” Phys. Rev. Lett. 93(18), 187801–187804 (2004).
[CrossRef] [PubMed]

Science (2)

I. Muševič, M. Škarabot, U. Tkalec, M. Ravnik, and S. Žumer, “Two-dimensional nematic colloidal crystals self-assembled by topological defects,” Science 313(5789), 954–958 (2006).
[CrossRef] [PubMed]

P. Poulin, H. Stark, T. C. Lubensky, and D. A. Weitz, “Novel colloidal interactions in anisotropic fluids,” Science 275(5307), 1770–1773 (1997).
[CrossRef] [PubMed]

Soft Matter (1)

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer, and I. Muševič, “Janus nematic colloids,” Soft Matter 5(20), 3905–3919 (2009).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Left: SEM image of 2D array of 4.3 µm silica particles on a glass substrate. Right: SEM image of 4.3 µm silica particles coated with 3 nm of Cr and 50 nm of Au.

Fig. 2
Fig. 2

Microscope images of the three possible configurations of 4.3 µm Au/DMOAP capped colloids in a 10 µm thick planar cell of 5CB. When the dipolar capped colloidal particle (middle) is disturbed with a weak laser filed, we observe an irreversible transition into two possible stable configurations: Saturn ring (left) and novel, boojum-ring (right) configuration. The arrows in the dipolar capped colloidal particle images indicate rubbing direction of the planar cell. In the upper images no polarizers are used, the lower images show capped colloidal particles as observed under crossed polarizers. Schematics of the director fields are sketched above the corresponding configurations.

Fig. 3
Fig. 3

Microscope images of a 4.3 µm DMOAP/Au capped microsphere in a 10 µm thick planar cell of 5CB. The arrows indicate rubbing direction of the planar cell. (a) The capped colloidal particle between crossed polarizers. (b) No polarizers are used. (c) Schematics of the director field.

Fig. 4
Fig. 4

Left: Rotation of a 4.3 µm DMOAP/Au capped colloid in a 10 µm thick cell when trapped with a weak laser field of 10 mW. The colloid rotates around the axis parallel to the rubbing direction indicated by the arrow. The sequence of non-polarized images (a) - (h) depicts one cycle of 360°. Positions (a) and (e) are the two stable positions of a DMOAP/Au colloid in the planar nematic cell, positions (c) and (g) denote the orientation of a golden cap above and below the silanated hemisphere. The red cross marks the position of a laser trap. Right: Measured rotation frequency vs. incident laser power.

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