Abstract:
This research article provides a comprehensive analysis of a localized surface
plasmon resonance (LSPR) based sensor, which operates in the visible to near infrared region and uses a distinctive combination of two metals, ITO and Au as
the plasmonic layers to achieve exceptional sensitivity. The wavelength spectrum
this sensor can now measure has been extended by combining these two materials
in the RI region of 1.30 to 1.41, allowing the sensor to function in diverse fields
such as bioimaging, biosensing, photocatalysis etc. A distinct characteristic of the
sensor is also discussed which is termed as double polarization peak shift
sensitivity (DPPSS) indicating the detection of resonance peak shift in both x-pol
and y-pol simultaneously. DPPSS is the parameter based on which efficiency of
the sensor is analyzed, wavelength sensitivity (WS) and practicality of the
fabrication. After optimizing all the structural parameters of the proposed sensor,
it shows the highest DPPSS value of 19560 nm/RIU and the maximum
wavelength sensitivity of 19630 nm/RIU. The proposed sensor shows a resolution
of 5.09 × 10–6
. This indicates that the sensor can detect small changes in analyte
RI, precisely in the order of 10-6
. The proposed parameter DPPSS shows increased
range of wavelength for the detection purpose and also considers both x and y polarizations in this regard. The advantages of using both gold and ITO has been
discussed and it was observed that the sensor shows better performance with
minute change detections because of the use of these two plasmonic materials. In
addition to having a very high sensitivity, the suggested sensor is fabrication
friendly. The proposed research serves as a foundation for a thorough exploration
of the LSPR phenomena for PCF using noble metal nanospheres
Description:
Supervised by
Dr. Mohammad Rakibul Islam,
Professor and Head,
Department of Electrical and Electronics Engineering (EEE)
Islamic University of Technology (IUT)
Board Bazar, Gazipur-1704, Bangladesh
