Thursday, December 3, 2015

Abstract-Broadband antireflection coating for optimized terahertz beam splitters

Weien Lai, Norman Born, Lorenz Maximilian Schneider, Arash Rahimi-Iman, Jan C. Balzer, and Martin Koch

We investigate the potential of anti-ferromagnetic nanofilms as broadband antireflection coatings in the terahertz frequency range. The anti-ferromagnetic layer is modeled by an analytic wave-impedance matching approach. The experimental results of the transmission and reflection measurements demonstrate the effectiveness of our antireflection coatings. Furthermore, we use anti-ferromagnetic nanofilms as antireflection coating for a terahertz beam splitter. Compared with conventional terahertz beam splitters consisting of an uncoated thick silicon wafer, the coated silicon beam splitter has two advantages: elimination of multiple reflections and improvement of the signal-to-noise ratio for terahertz time-domain spectroscopy in reflection geometry.
© 2015 Optical Society of America
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