High-speed light modulation using complex refractive-index changes of electro-optic polymers

Harada, Kenji; Munakata, Katsuhiro; Itoh, Masahide; Yatagai, Toyohiko; Honda, Yutaka; Umegaki, Shinsuke
December 2000
Applied Physics Letters;12/4/2000, Vol. 77 Issue 23
Academic Journal
We propose a promising type of light modulator using complex refractive-index changes of electro-optic polymers in the wavelength region of absorption. The material used in this study is a high-glass-transition-temperature active-polyimide thin film. The wavelength dependence of electrically induced complex refractive-index changes and the modulation efficiency are evaluated. A modulation efficiency of 33.8% has been realized with 141 V rms applied potential at a wavelength of 633 nm. Very fast modulation at over 25 MHz has been demonstrated. © 2000 American Institute of Physics.


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