3D interferometric optical tweezers using a single spatial light modulator

Author(s): Ethan Schonbrun, Rafael Piestun, Pamela Jordan, Jon Cooper, Kurt Wulff, Johannes Courtial, and Miles Padgett

Abstract:

“Hexagonal arrays of micron sized silica beads have been trapped in three-dimensions within an optical lattice formed by the interference of multiple plane-waves. The optical lattice design with sharply peaked intensity gradients produces a stronger trapping force than the traditionally sinusoidal intensity distributions of other interferometric systems. The plane waves were generated using a single, phase-only, spatial light modulator (SLM), sited near a Talbot image plane of the traps. Compared to conventional optical tweezers, where the traps are formed in the Fourier-plane of the SLM, this approach may offer an advantage in the creation of large periodic array structures. This method of pattern formation may also be applicable to trapping arrays of atoms.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 13, Issue 10, pp. 3777-3786, 2006
DOI: 10.1364/OPEX.13.003777

Experimental demonstration of holographic three-dimensional light shaping using a Gerchberg–Saxton algorithm

Author(s): Graeme Whyte and Johannes Courtial

Abstract:

“We use a three-dimensional Gerchberg–Saxton algorithm (Shabtay (2003) Opt. Commun. 226 33) to calculate the Fourier-space representation of physically realizable light beams with arbitrarily shaped three-dimensional intensity distributions. From this representation we extract a phase-hologram pattern that allows us to create such light beams experimentally. We show several examples of experimentally shaped light beams.”

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Publication: New Journal of Physics
Issue/Year: New J. Phys. 7 117, 2005
DOI: 10.1088/1367-2630/7/1/117

Dynamic optical manipulation using intensity patterns directly projected by a reflective spatial light modulator

Author(s): S. H. Tao, X.-C. Yuan, H. B. Niu and X. Peng

Abstract:

“We propose a simple method to manipulate microparticles dynamically with intensity-modulated patterns projected by a spatial light modulator (SLM), on which the patterns are controlled by a computer directly. The patterns are intensity–intensity modulated by the SLM without involving any computation or algorithm. With the dynamic patterns we can manipulate particles interactively and visibly by drawing or mouse-dragging pictures or even playing a video file on the computer screen. Experimental observations verified the feasibility of the proposed technique as a simple and direct solution for interactive optical manipulation.”

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Publication: Review of Scientific Instruments
Issue/Year: Rev. Sci. Instrum. 76, 056103 (2005)
DOI: 10.1063/1.1898065

Compensation for pixel-mismatch errors in shift-multiplexed holographic data storage

Author(s): Sungphil Kim, Seok Ho Song, Jideog Kim, and Hong-Seok Lee

Abstract:

“To read out correct data from shift-multiplexed holographic data storage, we propose a novel method of pixel matching by use of a tiny plane-parallel refraction plate placed in the path of converging readout beams. Tilting the refraction plate produces a shift in the lateral position of the readout beam incident upon the holographic storage disk, leading to compensation for pixel-mismatch errors by an improvement in bit-error rate of 3 orders of magnitude.”

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Publication: Optics Letters
Issue/Year: Optics Letters, Vol. 30, Issue 7, pp. 771-773 (2005)
DOI: 10.1364/OL.30.000771

Computer-generated holograms with optimum bandwidths obtained with twisted-nematic liquid-crystal displays

Author(s): Victor Arrizón, Luis A. González, Rodrigo Ponce, and Alfonso Serrano-Heredia

Abstract:

“We discuss a computer-generated hologram for encoding arbitrary complex modulation based on a commercial twisted-nematic liquid-crystal display. This hologram is implemented with the constrained complex modulation provided by the display in a phase-mostly configuration. The hologram structure and transmittance are determined to obtain on-axis signal reconstruction, maximum bandwidth, optimum efficiency, and high signal-to-noise ratio. We employed the proposed holographic code for the experimental synthesis of first-order Bessel beams.”

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Publication: Applied Optics
Issue/Year: Applied Optics, Vol. 44, Issue 9, pp. 1625-1634, 2005
DOI: 10.1364/AO.44.001625

A single-stage reconfigurable 2-D optical perfect-shuffle network system using multiplexed phase holograms

Author(s): Kyongsik Choi Byoungho Lee

Abstract:

“We propose a single-stage reconfigurable two-dimensional (2-D) optical perfect-shuffle network system (PSNS) using multiplexed phase holograms on one phase-type spatial light modulator (SLM). Phase holograms are used that adopt dynamically combined and multiplexed holograms to implement 2-D perfect shuffling of optical images. Experimentally, we demonstrate the proof-of-principle of the proposed single-stage reconfigurable 2-D optical PSNS using a collimated light source, the multiplexed phase holograms on a phase-type SLM, and a Fourier transform lens.”

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Publication: IEEE, Photonics Technology Letters
Issue/Year: IEEE, Photonics Technology Letter, Volume: 17, Issue: 3 pp. 687-689 (2005)
DOI: 10.1109/LPT.2004.842327

Structure and scaling of helical modes of light

Author(s): Steven Sundbeck, Ilya Gruzberg, and David G. Grier

Abstract:

“Modes of light that contain topological defects such as screw dislocations can be focused into optical traps with interesting and useful properties. The way in which the intensity distribution within helical modes of light varies with topological charge is discussed, and new scaling predictions for their radial profiles that are consistent with experimental observations are introduced.”

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Publication: Optics Letters
Issue/Year: Optics Letters, Vol. 30, Issue 5, pp. 477-479 , 2005
DOI: 10.1364/OL.30.000477

Vortex knots in light

Author(s): J. Leach, M. R. Dennis, J. Courtial and M. J. Padgett

Abstract:

“Optical vortices generically arise when optical beams are combined. Recently, we reported how several laser beams containing optical vortices could be combined to form optical vortex loops, links and knots embedded in a light beam (Leach et al 2004 Nature 432 165). Here, we describe in detail the experiments in which vortex loops form these structures. The experimental construction follows a theoretical model originally proposed by Berry and Dennis, and the beams are synthesized using a programmable spatial light modulator and imaged using a CCD camera.”

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Publication:New Journal of Physics
Issue/Year:New J. Phys. 7, 55 (2005)
DOI: 10.1088/1367-2630/7/1/055

Spiral phase contrast imaging in microscopy

Author(s): Severin Fürhapter, Alexander Jesacher, Stefan Bernet, and Monika Ritsch-Marte

Abstract:

“We demonstrate an optical method for edge contrast enhancement in light microscopy. The method is based on holographic Fourier plane filtering of the microscopic image with a spiral phase element (also called vortex phase or helical phase filter) displayed as an off-axis hologram at a computer controlled high resolution spatial light modulator (SLM) in the optical imaging pathway. The phase hologram imprints a helical phase term of the form exp(i ??) on the diffracted light field in its Fourier plane. In the image plane, this results in a strong and isotropic edge contrast enhancement for both amplitude and phase objects.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 13, Issue 3, pp. 689-694, 2005
DOI: 10.1364/OPEX.13.000689

Photoporation and cell transfection using a violet diode laser

Author(s): L. Paterson, B. Agate, M. Comrie, R. Ferguson, T. Lake, J. Morris, A. Carruthers, C. T. Brown, W. Sibbett, P. Bryant, F. Gunn-Moore, A. Riches, and Kishan Dholakia

Abstract:

“The introduction and subsequent expression of foreign DNA inside living mammalian cells (transfection) is achieved by photoporation with a violet diode laser. We direct a compact 405 nm laser diode source into an inverted optical microscope configuration and expose cells to 0.3 mW for 40 ms. The localized optical power density of ~1200 MW/m2 is six orders of magnitude lower than that used in femtosecond photoporation (~104 TW/m2). The beam perforates the cell plasma membrane to allow uptake of plasmid DNA containing an antibiotic resistant gene as well as the green fluorescent protein (GFP) gene. Successfully transfected cells then expand into clonal groups which are used to create stable cell lines. The use of the violet diode laser offers a new and simple poration technique compatible with standard microscopes and is the simplest method of laser-assisted cell poration reported to date.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 13, Issue 2, pp. 595-600, 2005
DOI: 10.1364/OPEX.13.000595
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