Investigation into Ethanol Concentration Changes of Ethanol–Water Solution Using Polarization Property Associated with Surface Plasmon Resonance in Aluminum Grating in Conical Mounting
We experimentally investigated the changes in the ethanol concentration of an ethanol–water solution using a polarization property of the (specularly) reflected light associated with surface plasmon resonance (SPR) occurring in an aluminum diffraction grating in a conical mounting. The polarization...
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| Published in: | Sensors and materials Vol. 35; no. 11; p. 3551 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Tokyo
MYU Scientific Publishing Division
01-01-2023
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | We experimentally investigated the changes in the ethanol concentration of an ethanol–water solution using a polarization property of the (specularly) reflected light associated with surface plasmon resonance (SPR) occurring in an aluminum diffraction grating in a conical mounting. The polarization property, which is observed as a rapid change in the normalized Stokes parameter s3 of the reflected light, can be successfully applied to refractive index sensing: the zero-crossing point of s3 precisely and easily determines the resonance angle θsp at which SPR occurs; s3 in the vicinity of θsp varies largely in response to a small change in the refractive index of a sample. Using the features of the rapid change in s3, we examined the ethanol concentration changes over a wide range from 0 to 100 percent by weight (wt%) through the measurement of θsp. Furthermore, we detected a small amount of ethanol component in water through the measurement of s3 under the angle of incidence fixed at the resonance angle of pure water. |
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| ISSN: | 0914-4935 2435-0869 |
| DOI: | 10.18494/SAM4611 |