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

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1.	Engström, David, 1976, et al. (author) A study of near-lossless analog phase modulation in V-shaped switching FLC cells 2005 In: Proc. SPIE. ; 5936, s. 209-217 Conference paper (other academic/artistic)
2.	Engström, David, 1976, et al. (author) Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode 2006 In: Optics Letters. - 0146-9592 .- 1539-4794. ; 31:19, s. 2906-2908 Journal article (peer-reviewed)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.
3.	Engström, David, 1976, et al. (author) Near-lossless continuous phase modulation using the analog switching mode (V-shaped switching) in ferroelectric liquid crystals 2006 In: Applied Optics. - 0003-6935. ; 45:21, s. 5258-5269 Journal article (peer-reviewed)
4.	Engström, David, 1976, et al. (author) Three-level phase modulator based on orthoconic antiferroelectric liquid crystals 2006 In: Optics Letters. - 0146-9592 .- 1539-4794. ; 31:21, s. 3158-3160 Journal article (peer-reviewed)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.
5.	Hedsten, Karin, 1964, et al. (author) 2D laser beamsteering by integration of MEMS and diffractive optics 2006 In: Micro Structure Workshop 2006 (MSW06), Västerås, Sverige, 9-10 maj. ; , s. 59-C2a Conference paper (peer-reviewed)
6.	Hedsten, Karin, 1964, et al. (author) 2D VCSEL beam steering using MEMS and replicated diffractive micro-optics 2006 In: XX Eurosensors, Göteborg, Sverige, 17-20 september 2006. ; , s. T1C-03, 296-7- Conference paper (peer-reviewed)
7.	Hedsten, Karin, 1964, et al. (author) Downscaling Optical Biosensing System 2008 In: Proceedings of Micro System Workshop 2008 (MSW08) 6-7 Maj, Göteborg, Sweden. ; MSW08, s. S2-6, s. 205- Conference paper (peer-reviewed)
8.	Hedsten, Karin, 1964, et al. (author) MEMS-based VCSEL beam steering using replicated polymer diffractive lens 2008 In: Sensors and Actuators, A: Physical. - 0924-4247. ; 142:1, s. 336-345 Journal article (peer-reviewed)
9.	Hedsten, Karin, 1964, et al. (author) MEMS-based VCSEL beam steering using replicated polymer diffractive lens 2008 In: Sensors and Actuators, A: Physical. - : Elsevier BV. - 0924-4247 .- 1873-3069. ; 142:1, s. 336-345 Journal article (peer-reviewed)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).
10.	Adolfsson, Göran, 1981, et al. (author) Direct observation of lateral carrier diffusion in ridge waveguide 1.3 um GaInNAs-GaAs lasers using scanning near-field optical microscopy 2008 In: 21st IEEE International Semiconductor Laser Conference, ISLC 2008; Sorrento; Italy; 14 September 2008 through 18 September 2008. - 0899-9406. - 9781424417834 ; , s. 55-56 Conference paper (peer-reviewed)abstract Scanning near-field optical microscopy measurements of the lateral spontaneous emission profile for narrow ridge waveguide 1.3 um GaInNAs-GaAs lasers reveal significant lateral carrier diffusion, which can explain the high characteristic temperature of the threshold current.

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Result 1-10 of 37

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Type of publication: journal article (22); conference paper (14); book chapter (1)

Type of content: peer-reviewed (34); other academic/artistic (3)

Author/Editor: Bengtsson, Jörgen, 1 ... (37); Engström, David, 197 ... (13); Larsson, Anders, 195 ... (10); Enoksson, Peter, 195 ... (9); Hedsten, Karin, 1964 (9); Goksör, Mattias, 197 ... (7); show more...; Melin, Jonas (6); Adolfsson, Göran, 19 ... (5); Wang, Shu Min, 1963 (5); Sadeghi, Mahdad, 196 ... (5); Melanen, P. (5); Persson, Katrin (5); Nikolajeff, Fredrik (5); Gustavsson, Johan, 1 ... (5); Galt, Sheila, 1956 (5); Frank, Anders (5); Backsten, Jan (5); D'Havé, Koen, 1972 (4); Rudquist, Per, 1968 (4); Lim, Jun (4); Rydberg, Christer, 1 ... (4); Vilokkinen, Ville (3); Haglund, Åsa, 1976 (3); Rödjegård, Henrik, 1 ... (3); Nilsson, Richard (3); Magnusson, Anders, 1 ... (3); Persson, Martin, 197 ... (2); Löfving, Björn, 1970 (2); Jedrasik, Piotr, 195 ... (2); Sandström, Torbjörn (2); Milewski, Gabriel, 1 ... (2); Wolf, M. (1); Andersson, G (1); Wei, Yongqiang, 1975 (1); Savolainen, P. (1); Sipilä, Pekko (1); Sutherland, Duncan, ... (1); Rödjegård, Henrik (1); Amann, M. C. (1); Vukusic, Josip, 1972 (1); Andersson, Gert (1); Bachmann, A. (1); Dmitriev, Alexander, ... (1); Kashani-Shirazi, Kav ... (1); Larkins, Eric (1); Dumitrescu, Mihail (1); Schultz, K (1); Lim, J.J. (1); Uusimaa, Peteri (1); Pessa, Markus (1); show less...

University: Chalmers University of Technology (35); University of Gothenburg (5); Uppsala University (3)

Language: English (37)

Research subject (UKÄ/SCB): Engineering and Technology (26); Natural sciences (13); Medical and Health Sciences (1)

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