Grooved High-Reflective Films for Ultraviolet Emission Enhancement
Conventional ultraviolet microplasma sources typically lack a back-reflection structure, resulting in radiative power loss from the backside. To enhance the emission efficiency of ultraviolet microplasma devices around 220 nm, we propose a multilayer reflective coating composed of alternating high-...
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| Language: | English |
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MDPI AG
2025-06-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/7/644 |
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| author | Hengrui Zhang Zhanhua Huang Lin Zhang |
| author_facet | Hengrui Zhang Zhanhua Huang Lin Zhang |
| author_sort | Hengrui Zhang |
| collection | DOAJ |
| description | Conventional ultraviolet microplasma sources typically lack a back-reflection structure, resulting in radiative power loss from the backside. To enhance the emission efficiency of ultraviolet microplasma devices around 220 nm, we propose a multilayer reflective coating composed of alternating high- and low-refractive-index layers of Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>, within a V-shaped groove. Key structural parameters, including the number of alternating film layer pairs, groove width, and light source position, are investigated to show their effects on ultraviolet reflection characteristics. The results show that reducing the groove width greatly enhances light reflection. When the groove width is 6.5 μm, the device exhibits a reflection efficiency of 47.82% and power enhancement of 91.66%, representing improvements of 2.5-fold and 4.2-fold, respectively, compared to non-optimized cases. Device performance is also influenced by the offset of the light source, which is more sensitive along the horizontal direction. This study provides a practical solution for developing high-efficiency ultraviolet emission devices. |
| format | Article |
| id | doaj-art-110f1709b76d494a9870d6e2025de7da |
| institution | Kabale University |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-110f1709b76d494a9870d6e2025de7da2025-08-20T03:32:17ZengMDPI AGPhotonics2304-67322025-06-0112764410.3390/photonics12070644Grooved High-Reflective Films for Ultraviolet Emission EnhancementHengrui Zhang0Zhanhua Huang1Lin Zhang2State Key Laboratory of Precision Measuring Technology and Instruments, Key Laboratory of Opto-Electronic Information Technology of Ministry of Education, Tianjin Key Laboratory of Integrated Opto-Electronics Technologies and Devices, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Precision Measuring Technology and Instruments, Key Laboratory of Opto-Electronic Information Technology of Ministry of Education, Tianjin Key Laboratory of Integrated Opto-Electronics Technologies and Devices, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Precision Measuring Technology and Instruments, Key Laboratory of Opto-Electronic Information Technology of Ministry of Education, Tianjin Key Laboratory of Integrated Opto-Electronics Technologies and Devices, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, ChinaConventional ultraviolet microplasma sources typically lack a back-reflection structure, resulting in radiative power loss from the backside. To enhance the emission efficiency of ultraviolet microplasma devices around 220 nm, we propose a multilayer reflective coating composed of alternating high- and low-refractive-index layers of Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>, within a V-shaped groove. Key structural parameters, including the number of alternating film layer pairs, groove width, and light source position, are investigated to show their effects on ultraviolet reflection characteristics. The results show that reducing the groove width greatly enhances light reflection. When the groove width is 6.5 μm, the device exhibits a reflection efficiency of 47.82% and power enhancement of 91.66%, representing improvements of 2.5-fold and 4.2-fold, respectively, compared to non-optimized cases. Device performance is also influenced by the offset of the light source, which is more sensitive along the horizontal direction. This study provides a practical solution for developing high-efficiency ultraviolet emission devices.https://www.mdpi.com/2304-6732/12/7/644ultraviolet high-reflective filmsgroove-shaped deviceemission enhancement |
| spellingShingle | Hengrui Zhang Zhanhua Huang Lin Zhang Grooved High-Reflective Films for Ultraviolet Emission Enhancement Photonics ultraviolet high-reflective films groove-shaped device emission enhancement |
| title | Grooved High-Reflective Films for Ultraviolet Emission Enhancement |
| title_full | Grooved High-Reflective Films for Ultraviolet Emission Enhancement |
| title_fullStr | Grooved High-Reflective Films for Ultraviolet Emission Enhancement |
| title_full_unstemmed | Grooved High-Reflective Films for Ultraviolet Emission Enhancement |
| title_short | Grooved High-Reflective Films for Ultraviolet Emission Enhancement |
| title_sort | grooved high reflective films for ultraviolet emission enhancement |
| topic | ultraviolet high-reflective films groove-shaped device emission enhancement |
| url | https://www.mdpi.com/2304-6732/12/7/644 |
| work_keys_str_mv | AT hengruizhang groovedhighreflectivefilmsforultravioletemissionenhancement AT zhanhuahuang groovedhighreflectivefilmsforultravioletemissionenhancement AT linzhang groovedhighreflectivefilmsforultravioletemissionenhancement |