| 摘要 |
<P>PROBLEM TO BE SOLVED: To miniaturize a distance measuring apparatus which measures the distance to a measuring object by the interference of light. Ž<P>SOLUTION: The distance measuring apparatus is constituted of a light source 10 and a splitter 11, which form measuring light and reference light, an optical path length control means 12 which controls an optical path length of the reference light, a detector 13 and a controller 14. The optical path length control means 12 is constituted of a photonic crystal 121, which is made of a ferroelectric material and has electron holes 124 formed periodically at certain intervals, and of metal thin film electrodes 122 and 123 provided on the opposite sides of the photonic crystal 121. By impressing a voltage on the photonic crystal 121 through the intermediary of the metal thin-film electrodes 122 and 123, a photonic band structure of the photonic crystal 121 can be changed. Accordingly, the optical path length of the reference light can be controlled according to an impressed voltage value, if the reference light is made to be incident on the photonic crystal 121. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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