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Published on: June 5, 2019
Surface-enhanced infrared spectroscopy using metal oxide plasmonic antenna arrays
Martina Abb1, Yudong Wang, Nikitas Papasimakis
1Physics and Astronomy, Faculty of Physical Sciences and Engineering, ‡Nano Group, Faculty of Physical Sciences and Engineering, and §Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton , Highfield, Southampton SO17 1BJ, United Kingdom.
We demonstrate surface-enhanced infrared spectroscopy using indium tin oxide (ITO) nanoantennas. These ultracompact ITO antennas offer high performance for infrared plasmonics and novel device applications.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Surface-enhanced infrared spectroscopy (SEIR) typically utilizes noble metal nanostructures.
- Indium tin oxide (ITO) is a transparent conductive oxide with tunable plasmonic properties.
Purpose of the Study:
- To demonstrate SEIR using ITO plasmonic nanoantennas.
- To explore the potential of ITO for ultracompact antenna arrays and subwavelength metamaterials.
- To investigate plasmonic near-field coupling in dense ITO nanoantenna arrays.
Main Methods:
- Fabrication of ITO nanoantenna arrays.
- Characterization of plasmonic properties and spectral response.
- Integration into surface-enhanced infrared spectroscopy measurements.
Main Results:
- ITO nanoantennas exhibited a strongly reduced plasmon wavelength.
- High plasmon confinement and reduced antenna cross-section enabled high-density integration.
- Plasmonic near-field coupling was accessed by reducing antenna spacing, enhancing spectral response.
- Demonstrated high spatial and spectral selectivity in spectroscopic applications.
Conclusions:
- Ultracompact ITO nanoantennas provide a viable platform for infrared plasmonics.
- ITO antennas offer a promising alternative to traditional plasmonic materials.
- The versatility of ITO allows for integration with other functionalities in advanced devices.
