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Low-dimensional plasmonic materials can function as high quality terahertzand infrared antennas at deep subwavelength scales. Despite these antennas'strong coupling to electromagnetic fields, there is a pressing need to furtherstrengthen their absorption. We address this problem by fabricating thick filmsof aligned, uniformly sized carbon nanotubes and showing that their plasmonresonances are strong, narrow, and broadly tunable. With thicknesses rangingfrom 25 to 250 nm, our films exhibit peak attenuation reaching 70%, qualityfactors reaching 9, and electrostatically tunable peak frequencies by a factorof 2.3x. Excellent nanotube alignment leads to the attenuation being 99%linearly polarized along the nanotube axis. Increasing the film thicknessblueshifts the plasmon resonators down to peak wavelengths as low as 1.4micrometers, promoting them to a new near-infrared regime in which they canboth overlap the S11 nanotube exciton energy and access the technologicallyimportant infrared telecom band.

Strong and broadly tunable plasmon resonances in thick films of aligned carbon nanotubes