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Träfflista för sökning "WFRF:(Bengtsson Jörgen 1968 ) srt2:(2005-2009)"

Sökning: WFRF:(Bengtsson Jörgen 1968 ) > (2005-2009)

  • Resultat 1-10 av 37
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  • Engström, David, 1976, et al. (författare)
  • Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode
  • 2006
  • Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 31:19, s. 2906-2908
  • Tidskriftsartikel (refereegranskat)abstract
    • We have studied the analog (V-shaped switching) mode in ferroelectric liquid crystals in reflective mode for analog phase modulation applications. We have found that several combinations of cell thicknesses and input polarization states exist for which near-lossless analog phase modulation with a range of ~2π rad is obtained, and we demonstrate one such combination experimentally. Despite a slight deviation from the ideal conditions, e.g., the tilt angle was 38° instead of the desired 45°, virtually pure 1.6π rad phase modulation was obtained; the measured values agree very well with our numerical simulations of the real device.
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  • Engström, David, 1976, et al. (författare)
  • Three-level phase modulator based on orthoconic antiferroelectric liquid crystals
  • 2006
  • Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 31:21, s. 3158-3160
  • Tidskriftsartikel (refereegranskat)abstract
    • Surface-stabilized orthoconic antiferroelectric liquid crystals (OAFLCs) have a director tilt of θ=45° and are, with no field applied, negatively uniaxial with the optic axis perpendicular to the cell substrates. We demonstrate that OAFLCs can be utilized to achieve lossless phase modulation with three almost equidistant phase levels. This turns out to be true also for polymer-stabilized OAFLCs, where the polymer network increases the switching speed of the device without affecting the phase modulation appreciably.
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  • Hedsten, Karin, 1964, et al. (författare)
  • Downscaling Optical Biosensing System
  • 2008
  • Ingår i: Proceedings of Micro System Workshop 2008 (MSW08) 6-7 Maj, Göteborg, Sweden. ; MSW08, s. S2-6, s. 205-
  • Konferensbidrag (refereegranskat)
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  • Hedsten, Karin, 1964, et al. (författare)
  • MEMS-based VCSEL beam steering using replicated polymer diffractive lens
  • 2008
  • Ingår i: Sensors and Actuators, A: Physical. - : Elsevier BV. - 0924-4247 .- 1873-3069. ; 142:1, s. 336-345
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract. This paper describes a fully integrated micro-optical system, in which dynamic angular control of the beam from a VCSEL (vertical cavity surface emitting laser) is realized by laterally moving a collimat¬ing diffractive lens in the light path. The lens is mounted on a translatable silicon stage, which consists of a frame with an opening for the light to traverse the lens and electro-statically driven comb actuators, by which the lateral movement is achieved. Devices implementing both 1D and 2D scanning have been fabricated and evaluated. Integration of the lens onto the translatable silicon stage is done using a newly developed fabrication process based on hot embossing of an amorphous fluorocarbon polymer. This fabrication process relies on a reversed-order protocol, where the structuring of the optical element precedes the silicon microstructuring. Assembly and packaging of the VCSEL-MOEMS system, using LTCC (low temperature cofired ceramic) technique, is also demonstrated. Optical evaluation of the system and beam steering function shows significant beam deflection for a relatively low driving voltage (~70 V).
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  • Resultat 1-10 av 37
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Bengtsson, Jörgen, 1 ... (37)
Engström, David, 197 ... (13)
Larsson, Anders, 195 ... (10)
Enoksson, Peter, 195 ... (9)
Hedsten, Karin, 1964 (9)
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Galt, Sheila, 1956 (5)
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Rudquist, Per, 1968 (4)
Lim, Jun (4)
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