Effect of chirp in diffraction of short electromagnetic pulses through subwavelength apertures
- 25 February 2002
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 80 (8) , 1319-1321
- https://doi.org/10.1063/1.1452786
Abstract
Short electromagnetic pulses experience significant spectral and temporal deformation when diffracted on subwavelength apertures. Temporal delay/advancement is one of the effects that occurs when a pulse passes through the aperture. In this study, it is demonstrated that the intrinsic negative chirp of terahertz pulses is the origin of the temporal advancement in the limit that the aperture is much smaller than the wavelength of the pulse. The advancement is shown to disappear for unchirped terahertz pulses. The chirp effect is general for any system where the diffracted or scattered field is wavelength dependent.Keywords
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