| 摘要 |
PURPOSE:To improve the stability of an optical control device and, at the same time, to easily manufacture the device by forming a transparent semiconductor film having a refractive index which is about the same as that of transparent electrodes and specific resistance which is smaller than that of a crystalline base plate of an inductive material, but higher than a specific multiple of that of the electrodes around the electrodes. CONSTITUTION:A transparent semiconductor film 16 having a refractive index which is about the same as that of transparent electrodes 15 and specific resistance which is smaller than that of a base plate, but higher than the 10<5> of that of the electrodes 15 is provided around the electrodes 15 so as to uniformize electric charges locally accumulated on the base plate and eliminate unstable operations. Since the specific resistance of the film 16 is sufficiently large as compared with that of the electrodes 15, electric fields of sufficiently large magnitudes can be impressed upon optical waveguides 2 and 3 in the vicinity of the electrodes 15. Therefore, the stability of this optical control device can be improved and device can be manufactured easily. |
