Title :
Effect of chirp in diffraction of short electromagnetic pulses through subwavelength apertures
Author :
Mitrofanov, O. ; Lee, M. ; Pfeiffer, L.N. ; West, K.W.
Author_Institution :
Lucent Technol. Bell Labs., Murray Hill, NJ, USA
Abstract :
Summary form only given. We demonstrate experimentally that the temporal advancement of THz pulses in diffraction by a subwavelength aperture is due to the intrinsic negative chirp. The effect is clearly observed only for sufficiently small apertures, when the bandwidth of the transmitted pulse exceeds the bandwidth on the incident pulse. The temporal advancement can be removed by eliminating the chirp of the THz pulse. For pulses generated by transient current in low temperature GaAs switches, the chirp is eliminated when long (1 ps) optical pulses are used to excite the photoconductor.
Keywords :
chirp modulation; electromagnetic pulse; electromagnetic wave diffraction; optical modulation; optical pulse generation; submillimetre wave generation; 10 micron; GaAs switches; THz pulses; incident pulse; intrinsic negative chirp; long optical pulses; low temperature; photoconductor; short electromagnetic pulse diffraction; subwavelength apertures; transient current; transmitted pulse; Chirp modulation; EMP radiation effects; Electromagnetic diffraction; Optical modulation;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2002. QELS '02. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Long Beach, CA, USA
Print_ISBN :
1-55752-708-3
DOI :
10.1109/QELS.2002.1031069
