Abstract

We demonstrate a technique for measuring pulse propagation time delays with 0.5-fs resolution by use of a widely available 100-fs pulsed laser. Using this technique, we measured the time delay of a light pulse transiting through subwavelength apertures placed on a 0.3μm metallic film. We measured a 7-fs total transit time, corresponding to an effective group velocity of c/7. The experimental result yielded additional evidence that light interacts resonantly with oscillators formed by the surface modes near the small apertures.

© 2001 Optical Society of America

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