Abstract
The transmittance, reflectance, and extinctance that correspond to the localized plasmonic resonance within TiN nanorods were investigated. The obliquely deposited TiN nanorod array shows polarization-independent admittance matching to air. Unlike noble metal nanorods, the near-field localized longitudinal and transverse plasmonic resonance of TiN nanorod arrays present polarization-dependent light extinction in the far field. The longitudinal plasmonic mode presents stronger extinction than transverse plasmonic mode. In order to have high efficient light absorption, an ultra-thin two-layered TiN nanorod array was fabricated with orthogonal deposition planes for upper layer and bottom layer to absorb different polarized light energy. The measured spectrum shows broadband and wide-angle light extinction.
Highlights
The transmittance, reflectance, and extinctance that correspond to the localized plasmonic resonance within titanium nitride (TiN) nanorods were investigated
The extraordinary properties of TiN depend on its nanostructure, which is responsible for its subwavelength plasmonic resonance
With the deposition parameters that are mentioned in the section of methods, a uniform TiN film was deposited and its permittivity spectrum was measured; the spectrum is shown in the supplementary information
Summary
The transmittance, reflectance, and extinctance that correspond to the localized plasmonic resonance within TiN nanorods were investigated. The near-field localized longitudinal and transverse plasmonic resonance of TiN nanorod arrays present polarizationdependent light extinction in the far field. In order to have high efficient light absorption, an ultrathin two-layered TiN nanorod array was fabricated with orthogonal deposition planes for upper layer and bottom layer to absorb different polarized light energy. Yi-Jun et al.[14] developed a seven-layered symmetrical film stack that comprised Ta2O5, Ge, Cr and Al as an equivalent layer with tailored admittance of close to unity and a refractive index with a large extinction coefficient, achieving an absorptance of 92% over a wide range of wavelengths of light, 400–2000 nm. The high operating temperature of thermovoltaic devices prevents the use of noble metals in plasmonic metamaterial absorbers. The absorption of a glancing angle-deposited TiN nanorod array (NRA) has been demonstrated to vary with the deposition p arameters[24]
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