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1.
  • Engström, David, 1976, et al. (creator_code:aut_t)
  • Grid-free 3D multiple spot generation with an efficient single-plane FFT-based algorithm
  • 2009
  • record:In_t: Optics Express. - 1094-4087. ; 17:12, s. 9989-10000
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Algorithms based on the fast Fourier transform (FFT) for the design of spot-generating computer generated holograms (CGHs) typically only make use of a few sample positions in the propagated field. We have developed a new design method that much better utilizes the information-carrying capacity of the sampled propagated field. In this way design tasks which are difficult to accomplish with conventional FFT-based design methods, such as spot positioning at non-sample positions and/or spot positioning in 3D, are solved as easily as any standard design task using a conventional method. The new design method is based on a projection optimization, similar to that in the commonly used Gerchberg-Saxton algorithm, and the vastly improved design freedom comes at virtually no extra computational cost compared to the conventional design. Several different design tasks were demonstrated experimentally with a liquid crystal spatial light modulator, showing highly accurate creation of the desired field distributions.
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2.
  • Engström, David, 1976, et al. (creator_code:aut_t)
  • Unconventional structure-assisted optical manipulation of high-index nanowires in liquid crystals
  • 2012
  • record:In_t: Optics Express. - 1094-4087. ; 20:7, s. 7741-7748
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Stable optical trapping and manipulation of high-index particles in low-index host media is often impossible due to the dominance of scattering forces over gradient forces. Here we explore optical manipulation in liquid crystalline structured hosts and show that robust optical manipulation of high-index particles, such as GaN nanowires, is enabled by laser-induced distortions in long-range molecular alignment, via coupling of translational and rotational motions due to helicoidal molecular arrangement, or due to elastic repulsive interactions with confining substrates. Anisotropy of the viscoelastic liquid crystal medium and particle shape give rise to a number of robust unconventional trapping capabilities, which we use to characterize defect structures and study rheological properties of various thermotropic liquid crystals.
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3.
  • Eriksson, Emma, 1980, et al. (creator_code:aut_t)
  • The effect of external forces on discrete motion within holographic optical tweezers
  • 2007
  • record:In_t: Optics Express. - 1094-4087. ; 15:26, s. 18268-18274
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Holographic optical tweezers is a widely used technique to manipulate the individual positions of optically trapped micron-sized particles in a sample. The trap positions are changed by updating the holographic image displayed on a spatial light modulator. The updating process takes a finite time, resulting in a temporary decrease of the intensity, and thus the stiffness, of the optical trap. We have investigated this change in trap stiffness during the updating process by studying the motion of an optically trapped particle in a fluid flow. We found a highly nonlinear behavior of the change in trap stiffness vs. changes in step size. For step sizes up to approximately 300 nm the trap stiffness is decreasing. Above 300 nm the change in trap stiffness remains constant for all step sizes up to one particle radius. This information is crucial for optical force measurements using holographic optical tweezers.
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4.
  • Guldbrand, Stina, 1970, et al. (creator_code:aut_t)
  • Two-photon fluorescence correlation microscopy combined with measurements of point spread function; investigations made in human skin
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:15, s. 15289-15302
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Two-photon excitation fluorescence correlation spectroscopy (TPFCS) has been applied in connection to measurements of the point spread function (PSF) for quantitative analysis of sulphorhodamine B (SRB) in excised human skin. The PSF was measured using subresolution fluorescent beads embedded in the skin specimen. The PSF, measured as full width at half maximum (FWHM) was found to be 0.41 ± 0.05 μm in the lateral direction, and 1.2 ± 0.4 μm in the axial direction. The molecular diffusion of SRB inside the skin ranged between 0.5 and 15.0 × 10 −8 cm2/s. The diffusion coefficient is not dependent on depths down to 40 μm. The fluorophores were found to accumulate on the upper layers of the skin. This work is the first TPFCS study in human skin. The results show that TPFCS can be used for quantitative analyses of fluorescent compounds in human skin.
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5.
  • Persson, Martin, 1979, et al. (creator_code:aut_t)
  • Minimizing intensity fluctuations in dynamic holographic optical tweezers by restricted phase change
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:11, s. 11250-11263
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We present a method for reducing intensity fluctuations that typically occur when a spatial light modulator is updated between consecutive computer generated holograms. The method is applicable to most iterative hologram generating algorithms and minimizes the average phase difference between consecutive holograms. Applications with high stability requirements, such as optical force measurement with holographic optical tweezers, should benefit from this improvement. (C) 2010 Optical Society of America
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6.
  • Persson, Martin, 1979, et al. (creator_code:aut_t)
  • Reducing the effect of pixel crosstalk in phase only spatial light modulators
  • 2012
  • record:In_t: Optics Express. - 1094-4087. ; 20:20, s. 22334-22343
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • A method for compensating for pixel crosstalk in liquid crystal based spatial light modulators is presented. By modifying a commonly used hologram generating algorithm to account for pixel crosstalk, the intensity errors in obtained diffraction spot intensities are significantly reduced. We also introduce a novel method for characterizing the pixel crosstalk in phase-only spatial light modulators, providing input for the hologram generating algorithm. The methods are experimentally evaluated and an improvement of the spot uniformity by more than 100% is demonstrated for an SLM with large pixel crosstalk.
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