Surface plasmon resonance-based sensing utilizing spatial phase modulation in an imaging interferometer

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F20%3A10244744" target="_blank" >RIV/61989100:27240/20:10244744 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1424-8220/20/6/1616" target="_blank" >https://www.mdpi.com/1424-8220/20/6/1616</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/s20061616" target="_blank" >10.3390/s20061616</a>

Result language

angličtina

Original language name

Surface plasmon resonance-based sensing utilizing spatial phase modulation in an imaging interferometer

Original language description

Spatial phase modulation in an imaging interferometer is utilized in surface plasmon resonance (SPR) based sensing of liquid analytes. In the interferometer, a collimated light beam from a laser diode irradiating at 637.1 nm is passing through a polarizer and is reflected from a plasmonic structure of SF10/Cr/Au attached to a prism in the Kretschmann configuration. The beam passes through a combination of a Wollaston prism, a polarizer and a lens, and forms an interference pattern on a CCD sensor of a color camera. Interference patterns obtained for different liquid analytes are acquired and transferred to the computer for data processing. The sensing concept is based on the detection of a refractive index change, which is transformed via the SPR phenomenon into an interference fringe phase shift. By calculating the phase shift for the plasmonic structure of SF10/Cr/Au of known parameters we demonstrate that this technique can detect different weight concentrations of ethanol diluted in water, or equivalently, different changes in the refractive index. The sensitivity to the refractive index and the detection limit obtained are MINUS SIGN 278 rad/refractive-index-unit (RIU) and 3.6 x 10MINUS SIGN 6 RIU, respectively. The technique is demonstrated in experiments with the same liquid analytes as in the theory. Applying an original approach in retrieving the fringe phase shift, we revealed good agreement between experiment and theory, and the measured sensitivity to the refractive index and the detection limit reached MINUS SIGN 226 rad/RIU and 4.4 x 10MINUS SIGN 6 RIU, respectively. These results suggest that the SPR interferometer with the detection of a fringe phase shift is particularly useful in applications that require measuring refractive index changes with high sensitivity.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/EF17_048%2F0007399" target="_blank" >EF17_048/0007399: New Composite Materials for Environmental Applications</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Sensors

ISSN

1424-3210

e-ISSN

—

Volume of the periodical

20

Issue of the periodical within the volume

6

Country of publishing house

CH - SWITZERLAND

Number of pages

11

Pages from-to

"1616(1)"-"1616(11)"

UT code for WoS article

000529139700075

EID of the result in the Scopus database

2-s2.0-85081603448