Title

Infrared Surface Plasmon Resonance Hosts For Sensors

Keywords

Biosensor; Grating; Infrared; Surface plasmon

Abstract

A Surface Plasmon Resonance (SPR) biosensor that operates deep into the infrared (3-11 μm wavelengths) is potentially capable of bio molecule recognition based on both selective binding and characteristic vibrational modes. The goal is to operate such sensors at wavelengths where biological analytes are strongly differentiated by their IR absorption spectra and where the refractive index is increased by dispersion. This will provide enhanced selectivity and sensitivity, when biological analytes bind reversibly to bio molecular recognition elements attached to the sensor surface. This paper investigates potentially useful IR surface plasmon resonances hosts on lamellar gratings formed from various materials with plasma frequencies in the IR wavelength range. These materials include doped semiconductors, CuSnS, graphite and semimetal Bi and Sb. Theoretical results were compared with the experimental results. Penetration depth measurement from the experimental complex permeabilities values shows the tighter mode confinement than for usual Au giving better overlap with biological analytes. © 2011 SPIE.

Publication Date

9-14-2011

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

8173

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.900100

Socpus ID

80052590954 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052590954

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