CHARACTERIZATION OF AN OPTOELECTRONIC TERAHERTZ BEAM SYSTEM

被引:393
作者
VANEXTER, M [1 ]
GRISCHKOWSKY, DR [1 ]
机构
[1] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598
关键词
D O I
10.1109/22.60016
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We describe the performance of an optoelectronic THz beam system. The transmitter operation is based on the repetitive, subpicosecond laser excitation of a Hertzian dipole antenna embedded in a charged coplanar line. With this transmitter electromagnetic beams of 1 /2 cycle THz pulses at a repetition rate of 100 MHz are produced. The associated optoelectronic receiver is gated in synchronism with the excitation of the transmitter by subpicosecond pulses from the same laser source. With this receiver, the 10 nW beams of THz pulses were observed with a signal-to-noise ratio greater than 10000:1. Several sources contributing to the noise of the receiver are discussed, together with ways to reduce them. With an integration time of 125 ms, a signal-to-noise ratio of 1 is obtained for a THz beam with an average power of 10 ~16W. The receiver operates in the sampling mode and has a time resolution of 0.5 ps. © 1990 IEEE
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页码:1684 / 1691
页数:8
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