Title :
Non-steady-state photo-EMF effect in photorefractive polymers
Author :
Bittner, R. ; Meerholz, K. ; Stepanov, S.
Author_Institution :
Munich Univ., Germany
Abstract :
Summary form only given. The space-charge gratings and the conduction properties of photorefractive (PR) polymer films are investigated by taking advantage of the non-steady-state photo-ElectroMotive Force (or photo-EMF) effect. When a hologram is recorded under non-stationary conditions, e.g. by a vibrating interference pattern, interaction between the quasi-stationary space-charge field grating and the vibrating distribution of mobile charge carriers leads to a periodic electric current (photo-EMF current J/sup /spl Omega//) with the same frequency /spl Omega/ as the vibration of the interference pattern. Furthermore, if an external DC field is applied, a second harmonic photo-EMF current (J/sup 2/spl Omega//) is observed.
Keywords :
holographic gratings; optical polymers; photorefractive materials; photovoltaic effects; polymer films; space charge; DC electric field; charge carrier distribution; conduction; hologram; nonsteady-state photo-EMF; organic photoconductor; photorefractive polymer film; second harmonic current; space charge grating; vibrating interference pattern; Electrons; Frequency; Gratings; Interference; Optical films; Optical modulation; Optical scattering; Phase modulation; Photorefractive effect; Polymer films;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 1999. QELS '99. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-576-X
DOI :
10.1109/QELS.1999.807145
