Utilizing multiple scattering effect for highly sensitive optical refractive index sensing
The sensitivity of random optical diffraction to refractive index inhomogeneity is usually considered as a challenging obstacle for imaging or controlling light through scattering media. Here, on the opposite side, we utilize the natural randomness of strongly scattering media and their sensitivity...
| Những tác giả chính: | , , , |
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| Định dạng: | Journal Article |
| Ngôn ngữ: | English |
| Được phát hành: |
2022
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| Những chủ đề: | |
| Truy cập trực tuyến: | https://hdl.handle.net/10356/160967 |
| _version_ | 1826118249177153536 |
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| author | Tran, Vinh Sahoo, Sujit K. Wang, Dong Dang, Cuong |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Tran, Vinh Sahoo, Sujit K. Wang, Dong Dang, Cuong |
| author_sort | Tran, Vinh |
| collection | NTU |
| description | The sensitivity of random optical diffraction to refractive index inhomogeneity is usually considered as a challenging obstacle for imaging or controlling light through scattering media. Here, on the opposite side, we utilize the natural randomness of strongly scattering media and their sensitivity to refractive index inhomogeneity to develop a novel optical sensor. Unlike various sensing technologies with trade-off between complexity and sensitivity, we demonstrate a very simple sensing technique, which uses just ground glass optical diffusers to achieve very high sensitivity. Light propagating through a scattering medium is scattered multiple times at multiple interfaces between ground glass and the surrounding environment creating a speckle pattern, which is sensitive to the environment's refractive index. The correlation of speckle patterns indicates the change of refractive index around the scattering medium. Simply placing the rough surface of ground glasses in contact with sensing solution, we are able to detect the solution's refractive index change at resolution of 3.87 × 10−6 RIU, which is equivalent to the glucose concentration change of 12 ppm. More interestingly, the sensitivity of the proposed approach could be improved simply by adding more scattering surfaces in contact with the target medium. Our simple technique could be very useful for prominent applications in refractive index sensing such as measuring concentration of solution or gas. |
| first_indexed | 2024-10-01T04:40:37Z |
| format | Journal Article |
| id | ntu-10356/160967 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:40:37Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1609672022-08-10T00:57:21Z Utilizing multiple scattering effect for highly sensitive optical refractive index sensing Tran, Vinh Sahoo, Sujit K. Wang, Dong Dang, Cuong School of Electrical and Electronic Engineering Centre for OptoElectronics and Biophotonics (COEB) Engineering::Electrical and electronic engineering Optical Sensor Refractive Index Sensing The sensitivity of random optical diffraction to refractive index inhomogeneity is usually considered as a challenging obstacle for imaging or controlling light through scattering media. Here, on the opposite side, we utilize the natural randomness of strongly scattering media and their sensitivity to refractive index inhomogeneity to develop a novel optical sensor. Unlike various sensing technologies with trade-off between complexity and sensitivity, we demonstrate a very simple sensing technique, which uses just ground glass optical diffusers to achieve very high sensitivity. Light propagating through a scattering medium is scattered multiple times at multiple interfaces between ground glass and the surrounding environment creating a speckle pattern, which is sensitive to the environment's refractive index. The correlation of speckle patterns indicates the change of refractive index around the scattering medium. Simply placing the rough surface of ground glasses in contact with sensing solution, we are able to detect the solution's refractive index change at resolution of 3.87 × 10−6 RIU, which is equivalent to the glucose concentration change of 12 ppm. More interestingly, the sensitivity of the proposed approach could be improved simply by adding more scattering surfaces in contact with the target medium. Our simple technique could be very useful for prominent applications in refractive index sensing such as measuring concentration of solution or gas. Ministry of Education (MOE) We would like to thank the financial support from Singapore Ministry of Education through AcRF Tier1 grant MOE2017-T1-002- 142. 2022-08-10T00:57:21Z 2022-08-10T00:57:21Z 2020 Journal Article Tran, V., Sahoo, S. K., Wang, D. & Dang, C. (2020). Utilizing multiple scattering effect for highly sensitive optical refractive index sensing. Sensors and Actuators, A: Physical, 301, 111776-. https://dx.doi.org/10.1016/j.sna.2019.111776 0924-4247 https://hdl.handle.net/10356/160967 10.1016/j.sna.2019.111776 2-s2.0-85076239749 301 111776 en MOE2017-T1-002- 142 Sensors and Actuators, A: Physical © 2019 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Optical Sensor Refractive Index Sensing Tran, Vinh Sahoo, Sujit K. Wang, Dong Dang, Cuong Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title | Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title_full | Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title_fullStr | Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title_full_unstemmed | Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title_short | Utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| title_sort | utilizing multiple scattering effect for highly sensitive optical refractive index sensing |
| topic | Engineering::Electrical and electronic engineering Optical Sensor Refractive Index Sensing |
| url | https://hdl.handle.net/10356/160967 |
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