Title :
Observation of whispering gallery mode terahertz pulses
Author :
Jiangquan Zhang ; Grischkowsky, D.
Author_Institution :
Center for Laser & Photonics Res., Oklahoma State Univ., Stillwater, OK, USA
Abstract :
Summary form only given. We report the first observation of a subpsec THz pulse propagating as a superposition of WGM modes of a dielectric cylinder. Unlike other WGM-related studies that use a single frequency cw laser as the coupling source, we use subpsec THz pulses generated by a photoconductively switched coplanar stripline. Consequently, the coupled WGM pulse covers a continuous frequency range from 0.4 THz to 1.8 THz and consists of a superposition of several WGM modes. The WGM-THz pulses are coupled into and out of a silicon cylindrical cavity via a slab waveguide, and plano-cylindrical lenses are used to couple the energy into and out of the slab guide. Coupled-mode equations are used to analyze the coupling structure.
Keywords :
coupled mode analysis; dielectric waveguides; submillimetre wave propagation; waveguide couplers; waveguide theory; 0.4 to 1.8 THz; Si; continuous frequency range; coupled-mode equations; dielectric cylinder; photoconductively switched coplanar stripline; plano-cylindrical lenses; silicon cylindrical cavity; slab waveguide; subpicosecond THz pulse; whispering gallery mode terahertz pulses; Dielectrics; Frequency; Laser modes; Optical coupling; Optical propagation; Optical pulse generation; Photoconductivity; Slabs; Stripline; Whispering gallery modes;
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
DOI :
10.1109/CLEO.2002.1034454
