Formation of contour optical traps using a four-channel liquid crystal focusing device

Korobtsov, A. V.; Котова, С. П.; Losevsky, N. N.; Mayorova, A. M.; Samagin, S. A.

doi:10.1070/qe2014v044n12abeh015598

Cited by 13 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laser beams propagating through axicons have two significant properties: (a) they generate a line focus, where the on-axis intensity stays high over much longer distances compared to focusing by conventional lenses; and (b) they generate ring-like intensity profiles in the far field. Both of these properties proved useful in many applications such as atom guiding and trapping [24], annular focusing in laser machining [25], generation of quasi-non-diffracting Bessellike beams [26][27][28], subdiffraction limit imaging [29] and optical micromanipulation [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Котова¹,

Samagin²,

Pozhidaev³

et al. 2015

Phys. Rev. E

View full text Add to dashboard Cite

We study both experimentally and theoretically modulation of light in a planar aligned deformedhelix ferroelectric liquid crystal (DHFLC) cell with subwavelength helix pitch, which is also known as a short-pitch DHFLC. In our experiments, azimuthal angle of the in-plane optical axis and electrically controlled parts of the principal in-plane refractive indices were measured as a function of voltage applied across the cell. Theoretical results giving the effective optical tensor of a shortpitch DHFLC expressed in terms of the smectic tilt angle and the refractive indices of FLC are used to fit the experimental data. Optical anisotropy of the FLC material is found to be weakly biaxial. For both the transmissive and reflective modes, the results of fitting are applied to model phase and amplitude modulation of light in the DHFLC cell. We demonstrate that, if the thickness of the DHFLC layer is about 50 µm, the detrimental effect of field-induced rotation of the in-plane optical axes on the characteristics of an axicon designed using the DHFLC spatial light modulator in the reflective mode is negligible.

show abstract

Section: Introductionmentioning

confidence: 99%

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Котова¹,

Samagin²,

Pozhidaev³

et al. 2015

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…Those potentials provide the formation for the profile of phase delay in the form of a truncated cone. As a result, the light fields with intensity distribution in the form of a point spot or ring without OAM can be realized at some distance from the focusator [16][17][18].…”

Section: Formation Of Light Fields In Single Frequency and Dualfreque...mentioning

confidence: 99%

“…The LC focusator (or four-channel LC modulator) proposed by us previously [16,17] is also an example of a modal LC modulator. By using a LC focusator as an optical transparency it is possible to focus light into a point spot or a line segment and to form transverse distributions of intensity in the shape of various contours, with sizes, position and orientation controlled by means of applied voltages [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of ring-shaped light fields with orbital angular momentum using a modal type liquid crystal spatial modulator

Котова¹,

Mayorova²,

Samagin³

2018

J. Opt.

Self Cite

View full text Add to dashboard Cite

Techniques for forming vortex light fields using a modal type liquid crystal spatial modulator were proposed. An orbital angular momentum of light passing through the modulator or reflecting from it appears as a result of the jump in the profile of phase delay by means of using special configurations of contact electrodes and predetermined values of applying voltages. The features of the generated vortex beams and capabilities for their control were simulated.

show abstract

“…The corresponding intensity distributions can be formed either through modification of the Gaussian beam or superposition of vortex beams with the use of stationary diffractive optical elements. The contour optical traps (in the form of rings, ellipses and C-shaped) formed with the LC focusing device [6] can also be used to minimize the radiation effects. The advantage of this method for the traps formation is the possibility of real-time control of their shape and size.…”

Section: Introductionmentioning

confidence: 99%

Line Optical Traps Formed by Lc SLM

Korobtsov

Котова

Losevsky

et al. 2015

JBPE

View full text Add to dashboard Cite

Abstract. The methods for generation of optical traps in the form of line segments by means of liquid crystal modulators of two types are addressed in the paper, they are a multi--pixel modulator HOLOEYE HEO 1080P and a tunable liquid crystal focusing device (4--channel modulator) developed by the authors. The numerical and experimental assessment of the capture forces of the generated optical trap is fulfilled. The description of manipulation experiments with microobjects, including biological ones, carried out by the optical traps with the intensity distribution in the form of segments is offered.

show abstract

Formation of contour optical traps using a four-channel liquid crystal focusing device

Cited by 13 publications

References 22 publications

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Formation of ring-shaped light fields with orbital angular momentum using a modal type liquid crystal spatial modulator

Line Optical Traps Formed by Lc SLM

Contact Info

Product

Resources

About