In integrated optics there is sustained interest in polymeric components and devices - polymers are low-cost and fabrication is quite easy. A lot of work is done towards polymeric electro-optical and thermo-optical modulators and switches. Both types rely on a change in refractive index due to the electro-optic and the thermo-optic effect, respectively. For electro-optic polymers, special chromophores in the polymer-matrix have to be oriented in a poling process. Due to relaxation processes this orientation disappears with time, which means that electro-optic polymers are not stable with time. Thus the applications for polymer electro-optic modulators are limited. Although thermo-optical modulators do not reach as high modulation speed as electro-optical modulators there is a market for them in integrated optics e.g. in switching and routing. A big disadvantage of thermo-optical devices is the high electrical power consumption up to 80 mW for one single component. The achievable refractive index changes for the electro-optic as well as for the thermo-optic effect are quite small, resulting in device lengths of several mm to cm.The aim of this thesis is to investigate and to realize a completely new approach for polymeric waveguide modulators. This new approach relies on a thickness change instead of the change in refractive index. In the thesis first the feasibility of the approach is investigated theoretically. Then, the response times of the electrically induced thickness changes and the possible thickness changes are investigated experimentally. In the last part of the thesis results from a first realization of the device are presented and discussed.