TY  - JOUR
A1  - Wegener, Michael
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Apparent dielectric hysteresis without significant dipolar movement?
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Jäger, Matthias
A1  - Stegemann, George I.
A1  - Brinker, Walter
A1  - Yilmaz, Sükrü
A1  - Bauer, Siegfried
A1  - Horsthuis, W. H. G.
A1  - Moehlmann, Gustaaf R.
T1  - Comparison of quasi-phase-matching geometries for second-harmonic generation in poled polymer channel waveguides at 1.5 æm
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Wirges, Werner
A1  - Gerhard, Reimund
A1  - Dansachmüller, M.
A1  - Schwödiauer, R.
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Paajanen, Mika
A1  - Minkkinen, Hannu
A1  - Raukola, J.
T1  - Controlled inflation of voids in cellular polymer ferroelectrets : optimizing electromechanical transducer properties
N2  - When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation. (C) 2004 American Institute of Physics
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Dielectric investigation of photo-induced chromophore degradation in nonlinear optical side-chain polymer electrets
N2  - Organic materials with non-centrosymmetric chromophores are known to be susceptible to a number of photochemical processes, including reversible isomerization reactions as well as irreversible photo-oxidation or photo- reduction reactions. Reversible isomerization is the basis for a variety of applications, such as photo-induced poling, optical data storage and optical grating formation. The irreversible processes that involve the destruction of the chromophores have been found useful for the fabrication of optical waveguides, but they also limit the life times of polymeric photonic devices. In this paper, it is demonstrated that dielectric measurements allow for an in-depth investigation of non-reversible chromophore degradation processes in a typical side-chain polymer. The time- and temperature-dependent dielectric function of the polymer at 1 kHz enables us to follow the chromophore-degradation kinetics and to monitor the bleaching depth as a function of time at room and elevated temperatures
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Cheng, Z. Y.
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Das-Gupta, D. K.
T1  - Dielectric investigation of thermally-induced chromophore degradation in nonlinear optical polymer electrets
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Yilmaz, Sükrü
A1  - Wirges, Werner
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Michelotti, F.
A1  - Toussaere, E.
A1  - Levenson, R.
A1  - Liang, J.
A1  - Zyss, Joseph
T1  - Dielectric, pyroelectric and electro-optic monitoring of the cross-linking process and photo-induced poling of Red Acid Magly
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Tuncer, Enis
A1  - Gerhard, Reimund
A1  - Bauer, Siegfried
T1  - Elastic properties and electromechanical coupling factor of inflated polypropylene ferroelectrets
Y1  - 2006
SN  - 1-4244-0547-5
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Liang, J.
A1  - Zyss, Joseph
T1  - Electrical determination of the degree of cross-linking in a poled nonlinear optical polymer
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
A1  - Bauer, Siegfried
A1  - Bauer-Gogonea, Simona
A1  - Brinker, Walter
A1  - Dinger, Claudia
A1  - Molzow, Wolf-Dietrich
A1  - Wirges, Werner
A1  - Yilmaz, Sükrü
T1  - Electro-optical investigation of the dipole orientation in poled polymers
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Dinger, Claudia
A1  - Yilmaz, Sükrü
A1  - Brinker, Walter
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Ellipsometry and Michelson interferometry for fixed- and variable- frequency electro-optical measurements on poled polymers
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Kofod, Guggi
A1  - Wirges, Werner
A1  - Paajanen, Mika
A1  - Bauer, Siegfried
T1  - Energy minimization for self-organized structure formation and actuation
N2  - An approach for creating complex structures with embedded actuation in planar manufacturing steps is presented. Self-organization and energy minimization are central to this approach, illustrated with a model based on minimization of the hyperelastic free energy strain function of a stretched elastomer and the bending elastic energy of a plastic frame. A tulip-shaped gripper structure illustrates the technological potential of the approach. Advantages are simplicity of manufacture, complexity of final structures, and the ease with which any electroactive material can be exploited as means of actuation. (c) 2007 American Institute of Physics.
Y1  - 2007
UR  - http://apl.aip.org/
U6  - https://doi.org/10.1063/1.2695785
SN  - 0003-6951
ER  - 
TY  - JOUR
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Sessler, G. M.
T1  - Ferroelectrets : soft electroactive foams for transducers
Y1  - 2004
ER  - 
TY  - THES
A1  - Bauer, Siegfried
T1  - Gepolte Polymere für Anwendungen in der Sensorik und Photonik
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Monomorphs, bimorphs and multimorphs from polar polymer electrets
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Brinker, Walter
A1  - Yilmaz, Sükrü
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Phase-shift interference microscope for the investigation of dipoleorientation distributions
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Wirges, Werner
A1  - Gerhard, Reimund
A1  - Wintler, H. J.
T1  - Physical aging after photo-induced or thermally assisted poling for enhancing the stability of polymeric dipole glasses
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Bauer, Siegfried
T1  - Poled polymers for sensors and photonic applications
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Preparation and pyroelectrical investigation of bimorph polymer layers
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Donval, Ariela
A1  - Berkovic, Garry
A1  - Bauer-Gogonea, Simona
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Pyroelectric depth profiling of the optical nonlinearity caused by charge injection
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Bauer, Siegfried
A1  - Lang, Sidney B.
T1  - Pyroelectric polymer electrets
Y1  - 1996
ER  -