Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids
Detection of low-concentration molecules in liquids has been a challenge in sensing technologies. Raman spectroscopy is an effective approach for trace detection, which is in fact a “volume-excitation” and “volume-collection” technique in the analysis of liquid samples. However, for the commonly emp...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Journal of Spectroscopy |
| Online Access: | http://dx.doi.org/10.1155/2021/5588417 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832554002827444224 |
|---|---|
| author | Miao Liu Yunyun Mu Jingyun Hu Jiajun Li Xinping Zhang |
| author_facet | Miao Liu Yunyun Mu Jingyun Hu Jiajun Li Xinping Zhang |
| author_sort | Miao Liu |
| collection | DOAJ |
| description | Detection of low-concentration molecules in liquids has been a challenge in sensing technologies. Raman spectroscopy is an effective approach for trace detection, which is in fact a “volume-excitation” and “volume-collection” technique in the analysis of liquid samples. However, for the commonly employed one-pass excitation and back-scattering detection scheme, a large portion of both the excitation laser energy and the Raman-scattering light energy is wasted without efficient reuse or collection. In this consideration, we demonstrate a broadband optical feedback scheme by a curved high-reflection mirror for both the excitation and the Raman-scattering light, so that the excitation and the forward-propagating Raman signal can be back-reflected and collected with a high efficiency. Using the “F+2f” design, where F and f are the focal lengths of the focusing lens and curved reflection mirror, respectively, we were able to not only produce two focuses of the excitation laser beam but also extend the Raman interaction by a doubled distance. For the detection of pure ethanol molecules and the R6G molecules in water with a concentration of 10−3 M, the Raman signal was enhanced by a factor of about 5.6. The optical feedback scheme and discovered optical mechanisms supply effective improvements to the Raman spectroscopic measurements on liquid samples. |
| format | Article |
| id | doaj-art-3abe0df5383e41a5a55ea287d87c2911 |
| institution | Kabale University |
| issn | 2314-4920 2314-4939 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Spectroscopy |
| spelling | doaj-art-3abe0df5383e41a5a55ea287d87c29112025-02-03T05:52:37ZengWileyJournal of Spectroscopy2314-49202314-49392021-01-01202110.1155/2021/55884175588417Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of LiquidsMiao Liu0Yunyun Mu1Jingyun Hu2Jiajun Li3Xinping Zhang4Institute of Information Photonics Technology, Faculty of Science, Beijing University of Technology, Beijing 100124, ChinaInstitute of Information Photonics Technology, Faculty of Science, Beijing University of Technology, Beijing 100124, ChinaInstitute of Information Photonics Technology, Faculty of Science, Beijing University of Technology, Beijing 100124, ChinaInstitute of Information Photonics Technology, Faculty of Science, Beijing University of Technology, Beijing 100124, ChinaInstitute of Information Photonics Technology, Faculty of Science, Beijing University of Technology, Beijing 100124, ChinaDetection of low-concentration molecules in liquids has been a challenge in sensing technologies. Raman spectroscopy is an effective approach for trace detection, which is in fact a “volume-excitation” and “volume-collection” technique in the analysis of liquid samples. However, for the commonly employed one-pass excitation and back-scattering detection scheme, a large portion of both the excitation laser energy and the Raman-scattering light energy is wasted without efficient reuse or collection. In this consideration, we demonstrate a broadband optical feedback scheme by a curved high-reflection mirror for both the excitation and the Raman-scattering light, so that the excitation and the forward-propagating Raman signal can be back-reflected and collected with a high efficiency. Using the “F+2f” design, where F and f are the focal lengths of the focusing lens and curved reflection mirror, respectively, we were able to not only produce two focuses of the excitation laser beam but also extend the Raman interaction by a doubled distance. For the detection of pure ethanol molecules and the R6G molecules in water with a concentration of 10−3 M, the Raman signal was enhanced by a factor of about 5.6. The optical feedback scheme and discovered optical mechanisms supply effective improvements to the Raman spectroscopic measurements on liquid samples.http://dx.doi.org/10.1155/2021/5588417 |
| spellingShingle | Miao Liu Yunyun Mu Jingyun Hu Jiajun Li Xinping Zhang Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids Journal of Spectroscopy |
| title | Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids |
| title_full | Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids |
| title_fullStr | Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids |
| title_full_unstemmed | Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids |
| title_short | Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids |
| title_sort | optical feedback for sensitivity enhancement in direct raman detection of liquids |
| url | http://dx.doi.org/10.1155/2021/5588417 |
| work_keys_str_mv | AT miaoliu opticalfeedbackforsensitivityenhancementindirectramandetectionofliquids AT yunyunmu opticalfeedbackforsensitivityenhancementindirectramandetectionofliquids AT jingyunhu opticalfeedbackforsensitivityenhancementindirectramandetectionofliquids AT jiajunli opticalfeedbackforsensitivityenhancementindirectramandetectionofliquids AT xinpingzhang opticalfeedbackforsensitivityenhancementindirectramandetectionofliquids |