Control of the molecular alignment inside liquid-crystal droplets by use of laser tweezers

Naoki Murazawa, Saulius Juodkazis, Shigeki Matsuo, Hiroaki Misawa

研究成果: Article

36 引用 (Scopus)

抄録

Here, we demonstrate how the light-induced birefringence due to the dipole molecular realignment and anisotropic polarizability of a nematic liquid crystal inside a droplet changes the droplet's radial (and thus optically isotropic) structure into a birefringent one. This intensity-dependent change of birefringence can be understood in terms of the anisotropic polarizability and orientational optical nonlinear effect. Birefringence induced by laser tweezers changes the momentum of the passing light. In turn, for the circularly polarized tweezers, this change generates an angular momentum change large enough to spin micrometer-sized droplets. For the linearly polarized tweezers, the molecular ordering generates momentum, which laterally displaces the droplet. It is shown that the optical nonlinearity can be "large" enough to have mechanical (ponderomotive) implications, that is, it allows control of the movement and position of micro-objects with submicrometer resolution. The optically induced molecular alignment controlled by the polarization and power of the laser tweezers allows one to actuate, rotate, and translate objects which are up to 103-104 times larger than the constituent molecules themselves.

元の言語English
ページ(範囲)656-661
ページ数6
ジャーナルSmall
1
発行部数6
DOI
出版物ステータスPublished - 2005 5
外部発表Yes

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Liquid Crystals
Molecular orientation
Liquid crystals
Birefringence
Lasers
Momentum
Nematic liquid crystals
Angular momentum
Polarization
Molecules

ASJC Scopus subject areas

  • Biomaterials
  • Engineering (miscellaneous)
  • Biotechnology
  • Medicine(all)

これを引用

Control of the molecular alignment inside liquid-crystal droplets by use of laser tweezers. / Murazawa, Naoki; Juodkazis, Saulius; Matsuo, Shigeki; Misawa, Hiroaki.

:: Small, 巻 1, 番号 6, 05.2005, p. 656-661.

研究成果: Article

Murazawa, Naoki ; Juodkazis, Saulius ; Matsuo, Shigeki ; Misawa, Hiroaki. / Control of the molecular alignment inside liquid-crystal droplets by use of laser tweezers. :: Small. 2005 ; 巻 1, 番号 6. pp. 656-661.
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AB - Here, we demonstrate how the light-induced birefringence due to the dipole molecular realignment and anisotropic polarizability of a nematic liquid crystal inside a droplet changes the droplet's radial (and thus optically isotropic) structure into a birefringent one. This intensity-dependent change of birefringence can be understood in terms of the anisotropic polarizability and orientational optical nonlinear effect. Birefringence induced by laser tweezers changes the momentum of the passing light. In turn, for the circularly polarized tweezers, this change generates an angular momentum change large enough to spin micrometer-sized droplets. For the linearly polarized tweezers, the molecular ordering generates momentum, which laterally displaces the droplet. It is shown that the optical nonlinearity can be "large" enough to have mechanical (ponderomotive) implications, that is, it allows control of the movement and position of micro-objects with submicrometer resolution. The optically induced molecular alignment controlled by the polarization and power of the laser tweezers allows one to actuate, rotate, and translate objects which are up to 103-104 times larger than the constituent molecules themselves.

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