Effect of chirp in diffraction of short electromagnetic pulses through subwavelength apertures

Author

Mitrofanov, Oleg ; Lee, Minhung ; Pfeiffer, L.N. ; West, K.W.

Author_Institution

Lucent Technol. Bell Labs., Murray Hill, NJ, USA

fYear

2002

fDate

24-24 May 2002

Firstpage

132

Abstract

Summary from 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 wave diffraction; optical modulation; optical pulse generation; photoconducting materials; photoconducting switches; submillimetre wave generation; 1 ps; GaAs; GaAs switches; THz pulse chirp; THz pulses; bandwidth; incident pulse; intrinsic negative chirp; long optical pulses; low temperature; optical pulse generation; photoconductor excitation; subwavelength aperture diffraction; temporal advancement; transient current; transmitted pulse; Apertures; Bandwidth; Chirp; EMP radiation effects; Electromagnetic diffraction; Gallium arsenide; Optical pulse generation; Optical pulses; Optical switches; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2002. CLEO '02. Technical Digest. Summaries of Papers Presented at the

Conference_Location

Long Beach, CA, USA

Print_ISBN

1-55752-706-7

Type

conf

DOI

10.1109/CLEO.2002.1033524

Filename

1033524