Broadband resonances in indium-tin-oxide nanorod arrays

Shi Qiang Li, Kazuaki Sakoda, John B. Ketterson, Robert P. H. Chang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

There is currently much discussion within the nanophotonics community regarding the origin of wavelength selective absorption/scattering of light by the resonances in nanorod arrays. Here, we report a study of resonances in ordered indium-tin-oxide nanorod arrays resulting from waveguide-like modes. We find that with only a 2.4% geometrical coverage, micron-length nanorod arrays interact strongly with light across a surprisingly wide band from the visible to the mid-infrared, resulting in less than 10% transmission. Simulations show excellent agreement with our experimental observations. The field profile in the vicinity of the rods obtained from simulations shows that the electric field is mainly localized on the surfaces of the nanorods for all resonances. Based on our analysis, the resonances in the visible are different in character from those in the infrared. When light is incident on the array, part of it propagates in the space between the rods and part of it is guided within the rods. The phase difference (interference) at the ends of the rods forms the basis for the resonances in the visible region. The resonances in the infrared are Fabry-Perot-like resonances involving standing surface waves between the opposing ends of the rods. Simple analytical formulae predict the spectral positions of these resonances. It is suggested that these phenomena can be utilized for wavelength-selective photodetectors, modulators, and nanorod-based solar cells.

Original languageEnglish
Article number031104
JournalApplied Physics Letters
Volume107
Issue number3
DOIs
Publication statusPublished - Jul 20 2015

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indium oxides
tin oxides
nanorods
broadband
rods
wavelengths
surface waves
photometers
modulators
simulation
solar cells
waveguides
interference
electric fields
profiles
scattering

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Broadband resonances in indium-tin-oxide nanorod arrays. / Li, Shi Qiang; Sakoda, Kazuaki; Ketterson, John B.; Chang, Robert P. H.

In: Applied Physics Letters, Vol. 107, No. 3, 031104, 20.07.2015.

Research output: Contribution to journalArticle

Li, Shi Qiang ; Sakoda, Kazuaki ; Ketterson, John B. ; Chang, Robert P. H. / Broadband resonances in indium-tin-oxide nanorod arrays. In: Applied Physics Letters. 2015 ; Vol. 107, No. 3.
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