Ultrabroadband polarization analysis of terahertz pulses.
We describe the characteristics of a sensitive photoconductive detector that simultaneously measures orthogonal electric field components of electromagnetic transients with bandwidths up to 30 THz. The device consists of an As(+) implanted GaAs photoconducting region at the centre of a pair of perpendicular bow-tie antennas. The performance is illustrated by studies of optical rectification in GaSe, retardation in a birefringent polymer film and THz emission from impulsively excited optical phonons in GaN.
Hussain
A
A
Department of Physics, University of Bath, Bath, UK.
Andrews
S R
SR
D001152:Arsenicals / Q000737:chemistry*; D002942:Circular Dichroism; D055590:Electromagnetic Phenomena / Q000295:instrumentation; D004867:Equipment Design; D005708:Gallium / Q000737:chemistry*; D008027:Light; D055095:Optics and Photonics; D010777:Photochemistry / Q000379:methods*; D011827:Radiation; D012643:Selenium / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods
D001152:Arsenicals; C517764:gallium selenide; C473348:gallium nitride; C043055:gallium arsenide; D005708:Gallium; D012643:Selenium