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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(11) [November 2005] >
| Title: | Surface plasmon resonance based refractive index sensor for liquids |
| Authors: | Mehan, Navina
Gupta, Vinay
Sreenivas, K
Mansingh, Abhai |
| Keywords: | Surface plasmon resonance
Refractive index sensor
Optical characterization
Thin metal films |
| Issue Date: | Nov-2005 |
| Publisher: | CSIR |
| IPC Code: | G01N21/49 |
| Abstract: | A surface
plasmon resonance (SPR) refractive index sensor for liquids was fabricated and
characterized. A thin silver (Ag) film (545Å) was deposited on a prism face and
surface plasmon modes were excited along the interfaces of Ag and air, Ag and
water and Ag and sugar solutions by prism-coupling using a He-Ne laser. The
experimental SPR reflectance curves shifted continuously with increase in sugar
concentration. Theoretical fitting of the SPR dip angles yielded the dielectric
constant of Ag and refractive indices of water and sugar solutions. A maximum
sensitivity of 1.4×10-4 R.I.U. (refractive index units) was achieved
with SPR dip angle as variable parameter. With SPR reflectance as variable
parameter at a fixed angle, the maximum sensitivity was 3.9×10-5
R.I.U. in a selected narrow range of refractive index. |
| Page(s): | 854-858 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(11) [November 2005]
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