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Title: Tunability of indium tin oxide materials for mid-infrared plasmonics applications

Journal Article · · Optical Materials Express
DOI:https://doi.org/10.1364/OME.7.002727· OSTI ID:1418639
 [1];  [2];  [2];  [1];  [1];  [2];  [1]
  1. Boston Univ., Boston, MA (United States)
  2. Columbia Univ., New York, NY (United States)

Transparent conductive oxides (TCOs) have emerged as alternative plasmonic materials in recent years to replace noble metals. The advantages of TCOs include CMOS compatibility, tunability of optical and structural properties, and reduced losses. In this work, we demonstrate how post-deposition annealing of indium tin oxide (ITO) films in oxygen atmosphere allows for tuning their optical dispersion properties to the mid-infrared spectral range while simultaneously reducing their absorption losses. In particular, we show a materials strategy that extends the epsilon-near-zero (ENZ) point of ITO from the near-infrared to the mid-infrared range. This is demonstrated by fabricating periodic arrays of ITO discs of varying diameters and characterizing their plasmonic resonances in the mid-infrared range from λ = 5 to 10 µm. The developed ITO plasmonic structures pave the way to the development of novel infrared active devices for sensing and spectroscopy on a silicon-compatible platform.

Research Organization:
Boston Univ., MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1418639
Journal Information:
Optical Materials Express, Vol. 7, Issue 8; ISSN 2159-3930
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (12)

Nonlinear optical effects in epsilon-near-zero media journal June 2019
Towards integrated metatronics: a holistic approach on precise optical and electrical properties of Indium Tin Oxide journal August 2019
Epsilon-near-zero response in indium tin oxide thin films: Octave span tuning and IR plasmonics journal January 2020
The IR plasmonic properties of sub-wavelength ITO rod arrays predicted by anisotropic effective medium theory journal November 2019
Effect of oxygen stoichiometry on the structure, optical and epsilon-near-zero properties of indium tin oxide films journal January 2019
CMOS-compatible mid-IR metamaterial absorbers for out-of-band suppression in optical MEMS journal January 2018
Hierarchical laser patterning of indium tin oxide thin films journal January 2019
Indium–Tin–Oxide Nanostructures for Plasmon-Enhanced Infrared Spectroscopy: A Numerical Study journal April 2019
Nanoantenna Structure with Mid-Infrared Plasmonic Niobium-Doped Titanium Oxide journal December 2019
Defect-Induced Tunable Permittivity of Epsilon-Near-Zero in Indium Tin Oxide Thin Films journal November 2018
Broadband Absorption Tailoring of SiO2/Cu/ITO Arrays Based on Hybrid Coupled Resonance Mode journal June 2019
Towards integrated metatronics: a holistic approach on precise optical and electrical properties of Indium Tin Oxide preprint January 2018

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