期刊
PHYSICAL REVIEW APPLIED
卷 14, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.14.044006
关键词
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资金
- Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI) [FA9550-161-0031]
- Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program
- National Science Foundation [ECCS-1542152]
- Harvard Center for Nanoscale Systems (CNS)
- NSF [NNCI-1541959]
- Department of Energy [DE-SC0019300]
- U.S. Department of Energy (DOE) [DE-SC0019300] Funding Source: U.S. Department of Energy (DOE)
Aligned densely packed carbon-nanotube metamaterials prepared using vacuum filtration are an emerging infrared nanophotonic material. We report multiple hyperbolic plasmon resonances, together spanning the mid-infrared, in individual resonators made from aligned and densely packed carbon nanotubes. In a near-field scanning optical microscopy (NSOM) imaging study of nanotube metamaterial resonators, we observe distinct deeply subwavelength field profiles at the fundamental and higher-order resonant frequencies. The wafer-scale area of the nanotube metamaterials allows us to combine this near-field imaging with a systematic far-field spectroscopic study of the scaling properties of many resonator arrays. Thorough theoretical modeling agrees with these measurements and identifies the resonances as higher-order Fabry-Perot (FP) resonances of hyperbolic waveguide modes. Nanotube resonator arrays show broadband extinction from 1.5-10 mu m and reversibly switchable extinction in the 3-5 mu m atmospheric transparency window through the coexistence of multiple modes in individual ribbons. Broadband carbon-nanotube metamaterials supporting multiple resonant modes are a promising candidate for ultracompact absorbers, tunable thermal emitters, and broadband sensors in the mid-infrared.
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