Skip to main content

Fiber-Optic Surface Plasmon Resonance Sensors in the Near-Infrared Spectral Region

Buy Article:

$29.00 plus tax (Refund Policy)

Abstract:

The sensitivity of fiber-optic surface plasmon resonance (SPR) sensors was improved by a factor of at least thirteen for aqueous solutions by modifying the tip geometry to allow interrogation of the surface plasmon (SP) band in the near-infrared (NIR) region. This was achieved by tuning the angle at the distal end of the SPR sensor to a dual taper of 71° and 19°. Using a low numerical aperture (NA) fiber-optic sensor, NA = 0.12, is necessary to obtain a functional SPR sensor working in the NIR region. Theoretical simulations using the Maxwell equations demonstrated that even higher enhancement is theoretically possible while maintaining a narrow spectral feature upon the excitation of the SP bands on gold surfaces. The manufacture of the SPR sensors yields good agreement between theoretical simulations and experimental observations. To investigate the properties of these fiber-optic SPR-NIR sensors, sucrose solutions ranging from 0 to 15 × 10−3 in mole fraction were utilized. The increased sensitivity of the fiber-optic SPR sensors, when used to monitor biomarkers, would yield lower detection limits. The smaller sensing area, compared to planar or other fiber-optic SPR sensors, combined with an improvement of the sensitivity, would yield a dramatic reduction of the absolute amount detected by biosensors.

Keywords: BIOSENSORS; FIBER-OPTIC SENSORS; MINIATURE SENSOR; REFRACTIVE INDEX; SPR; SURFACE PLASMON RESONANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206778999139

Affiliations: Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604

Publication date: November 1, 2006

More about this publication?
sas/sas/2006/00000060/00000011/art00006
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more