Transparent Conducting Oxides (TCOs) are emerging as possible alternative constituent materials to replace noble metals such as silver and gold for low-loss plasmonic applications in the Near-Infrared (NIR) and Mid-Infrared (MIR) regimes. In particular, TCO-based nanostructures are extensively investigated for biospectroscopy exploiting their surface enhanced infrared absorption (SEIRA). The latter enhances the absorption from vibrational and rotational modes of nearby bio-molecules making TCO nanostructures, a promising candidate for IR sensing applications. Nevertheless, in order to produce inexpensive devices for lab-on-chip diagnostics, it would be auspicable to achieve surface enhanced infrared absorption with very simple microstructures not requiring nano-size control. In this work, we attempt to demonstrate SEIRA effect with the least challenging fabrication, μm-scale instead of nm-scale, by tailoring both device design and charge density of ITO film. We show that micro-periodic hole arrays in a ITO film are able to produce SEIRA via grating coupling. Such a study opens the way for innovative and disrupting biosensing devices.

Mid-Infrared Plasmonic excitation in Indium Tin Oxide micro-hole arrays

ESPOSITO, MARCO;GAMBINO, SALVATORE;LIO, GIUSEPPE EMANUELE;De Luca, Antonio
Software
;
2018

Abstract

Transparent Conducting Oxides (TCOs) are emerging as possible alternative constituent materials to replace noble metals such as silver and gold for low-loss plasmonic applications in the Near-Infrared (NIR) and Mid-Infrared (MIR) regimes. In particular, TCO-based nanostructures are extensively investigated for biospectroscopy exploiting their surface enhanced infrared absorption (SEIRA). The latter enhances the absorption from vibrational and rotational modes of nearby bio-molecules making TCO nanostructures, a promising candidate for IR sensing applications. Nevertheless, in order to produce inexpensive devices for lab-on-chip diagnostics, it would be auspicable to achieve surface enhanced infrared absorption with very simple microstructures not requiring nano-size control. In this work, we attempt to demonstrate SEIRA effect with the least challenging fabrication, μm-scale instead of nm-scale, by tailoring both device design and charge density of ITO film. We show that micro-periodic hole arrays in a ITO film are able to produce SEIRA via grating coupling. Such a study opens the way for innovative and disrupting biosensing devices.
Electronic, Optical and Magnetic Materials; Biotechnology; Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
File in questo prodotto:
File Dimensione Formato  
ACSPhotonics_microholes_ITO_Cuscunà_2018.pdf

embargo fino al 08/05/2019

Descrizione: Edizione dell'editore al link: https://pubs.acs.org/doi/10.1021/acsphotonics.8b00214
Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 971.14 kB
Formato Adobe PDF
971.14 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/284404
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 19
social impact