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Resonances and permittivity dispersion effects in ITO nanorod arrays | | Shi-Qiang Li
; Kazuaki Sakoda
; John B. Ketterson
; Robert P. H. Chang
; | | Date: |
14 Nov 2014 | | Abstract: | In the nanophotonics community, there is an active discussion regarding the
origin of the selective absorption/scattering of light by the resonances with
nanorod arrays. Here we report a study of the resonances in ordered
indium-tin-oxide (ITO) nanorod arrays from the perspective of waveguides. We
discover that with only 2.4% geometrical coverage, the micron-length nanorod
arrays strongly interact with light across an extra-wide band from visible to
mid-infrared resulting in less than 10% transmission at the first order
destructive interference. Simulations show excellent agreement with our
experimental observation. Near-field profile obtained from simulation reveals
the electric field is mainly localized on the surfaces of the nanorods at all
the resonances. Theoretical analysis is then applied to explain the resonances
and it was found that the resonances in the visible are different from those in
the infrared. The former resonances are the result of the interference between
guided wave and wave propagated in the free space, while the latter ones are
standing wave formation determined by the length of nanorods and the
propagating constant of the guided wave (antenna modes). These differences
observed in the wavelength range studied are attributed to the unique
permittivity dispersion of ITO, which monotonically decreases from positive to
negative right at the near infrared. The simple analytical formulae developed
can be used to predict and design the resonances, which can be subsequently
applied to devices like wavelength-selective photodetector, modulators, and
nanorod-based solar cells. The discussion in this report should apply equally
well to other semiconductor nanorod/nanowire arrays and help to clarify
experimental interpretations in those published systems. | | Source: | arXiv, 1411.3767 | | Services: | Forum | Review | PDF | Favorites | |
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