Abstract-Photoconductive LT-GaAs Terahertz Antennas: Correlation Between Surface Quality and Emission Strength

• O. M. Abdulmunem
• K. I. Hassoon
• J. Völkner
• M. Mikulics
• K. I. Gries
• J. C. Balze

http://link.springer.com/article/10.1007/s10762-016-0353-y

We investigate the influence of the surface properties of a low-temperature-grown GaAs photoconductive antenna on the terahertz (THz) emission strength, using a specially designed THz time-domain spectroscopy system. The system allows us to excite six different positions along the 10 μm gap of a coplanar stripline antenna with a length of 10 mm without changing the alignment of the optical or THz beam path. A comparison to the surface roughness and the grain size which are extracted from an atomic force and a scanning electron microscope is given.