Abstract
A polarizer using a sinusoidal or triangular thin metallic-film subwavelength
grating is proposed. The dependence of polarizer transmission characteristics
on structural parameters of the grating was obtained numerically, and its
potential for high performance was confirmed experimentally. The measured
transmission loss for the TE-waves with a 25 nm-thick gold-film grating with
a triangular profile was higher than 50 dB while the corresponding transmission
loss for the TM-waves was lower than 1 dB in the frequency range of 1.0–2.5
THz. The metallic subwavelength grating structure has demonstrated its potential
as a low-loss, high-extinction ratio, wide-aperture, and robust polarizer
for the infrared and terahertz regions.
© 2011 IEEE
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