Research Papers

Effect of prism index on sensitivity of lossy mode resonance sensors operating in visible region

[+] Author Affiliations
Davinder Kaur, Avinashi Kapoor

University of Delhi, Department of Electronic Science, Photovoltaics and Opto Electronics Laboratory, South Campus, Benito Juarez Road, New Delhi 110021, India

Vinod K. Sharma

University of Delhi, Keshav Mahavidyalaya, Department of Electronics, H-4-5 Zone, Pitampura, Delhi 110034, India

J. Nanophoton. 9(1), 093042 (Oct 30, 2015). doi:10.1117/1.JNP.9.093042
History: Received June 12, 2015; Accepted September 30, 2015
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Abstract.  We present the theoretical results of the optimization of lossy mode resonance sensors at visible wavelengths. Both angular and spectral interrogations are carried out for absorbing indium tin oxide (ITO) films placed on glass prism. The inclusion of a low-index layer between the prism and the lossy (ITO) layer can produce an efficient refractive index sensor for bio/chemical applications. Further increase in sensitivity can be achieved by changing the index of the prism. It is shown that the sensitivity has strong dependence on the index of prism. Sensitivities as high as 4670  nm/RIU for spectral mode and 67  deg/RIU for angular mode with small values of full width at half maximum (FWHM) can be achieved. Dependence of sensitivity and FWHM on refractive index and thickness of low-index matching layer is also investigated.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Davinder Kaur ; Vinod K. Sharma and Avinashi Kapoor
"Effect of prism index on sensitivity of lossy mode resonance sensors operating in visible region", J. Nanophoton. 9(1), 093042 (Oct 30, 2015). ; http://dx.doi.org/10.1117/1.JNP.9.093042


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