Abstract
In free space, the measurement of electric signals is usually performed using antennas. However, antennas do not present flat responses over ultra wide bands covering e. g. more than 4 decades and are highly invasive. We present here an alternative and competitive solution based on electro-optic (EO) sensors that overcomes the drawbacks of antennas. The technique of EO sampling, which has emerged during the 80's [1] and that was dedicated to on-wafer probing, could radically change electrical measurements in free space since it can provide a spatial resolution and a frequency band, ten times and hundred times wider than antennas, respectively. Even if this new technology has been almost exclusively used in laboratory, the situation has quickly evolved with the first pigtailed EO sensors appeared at the beginning of the decade that have solved the problem of carrying the laser probe beam to the EO crystal constituting the sensor.
© 2007 IEEE
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