High Refractive Index GRIN Lens for IR Optics
Infrared gradient refractive index (GRIN) material lenses have attracted much attention due to their continuously varying refractive index as a function of spatial coordinates in the medium. Herein, a glass accumulation thermal diffusion method was used to fabricate a high refractive index GRIN lens...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/7/2566 |
| _version_ | 1797607569724801024 |
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| author | Yan Kang Jin Wang Yongkun Zhao Xudong Zhao Haizheng Tao Yinsheng Xu |
| author_facet | Yan Kang Jin Wang Yongkun Zhao Xudong Zhao Haizheng Tao Yinsheng Xu |
| author_sort | Yan Kang |
| collection | DOAJ |
| description | Infrared gradient refractive index (GRIN) material lenses have attracted much attention due to their continuously varying refractive index as a function of spatial coordinates in the medium. Herein, a glass accumulation thermal diffusion method was used to fabricate a high refractive index GRIN lens. Six Ge<sub>17.2</sub>As<sub>17.2</sub>Se<i><sub>x</sub></i>Te<sub>(65−<i>x</i>)</sub> (<i>x</i> = 10.5–16) glasses with good thermal stability and high refractive index (<i>n</i><sub>@10 μm</sub> > 3.1) were selected for thermal diffusion. The refractive index span (∆<i>n</i>) of 0.12 was achieved in this GRIN lens. After thermal diffusion, the lens still had good transmittance (45%) in the range of 8–12 μm. Thermal imaging confirmed that this lens can be molded into the designed shape. The refractive index profile was indirectly characterized by the structure and composition changes. The structure and composition variation became linear with the increase in temperature from 260 °C to 270 °C for 12 h, indicating that the refractive index changed linearly along the axis. The GRIN lens with a high refractive index could find applications in infrared optical systems and infrared lenses for thermal imaging. |
| first_indexed | 2024-03-11T05:32:49Z |
| format | Article |
| id | doaj.art-666587e78bca4a308a2e355278a1a7f8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T05:32:49Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-666587e78bca4a308a2e355278a1a7f82023-11-17T17:01:50ZengMDPI AGMaterials1996-19442023-03-01167256610.3390/ma16072566High Refractive Index GRIN Lens for IR OpticsYan Kang0Jin Wang1Yongkun Zhao2Xudong Zhao3Haizheng Tao4Yinsheng Xu5State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaResearch Center, Nanjing Wavelength Optoelectronic Technology Co., Ltd., Nanjing 211100, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaState Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, ChinaInfrared gradient refractive index (GRIN) material lenses have attracted much attention due to their continuously varying refractive index as a function of spatial coordinates in the medium. Herein, a glass accumulation thermal diffusion method was used to fabricate a high refractive index GRIN lens. Six Ge<sub>17.2</sub>As<sub>17.2</sub>Se<i><sub>x</sub></i>Te<sub>(65−<i>x</i>)</sub> (<i>x</i> = 10.5–16) glasses with good thermal stability and high refractive index (<i>n</i><sub>@10 μm</sub> > 3.1) were selected for thermal diffusion. The refractive index span (∆<i>n</i>) of 0.12 was achieved in this GRIN lens. After thermal diffusion, the lens still had good transmittance (45%) in the range of 8–12 μm. Thermal imaging confirmed that this lens can be molded into the designed shape. The refractive index profile was indirectly characterized by the structure and composition changes. The structure and composition variation became linear with the increase in temperature from 260 °C to 270 °C for 12 h, indicating that the refractive index changed linearly along the axis. The GRIN lens with a high refractive index could find applications in infrared optical systems and infrared lenses for thermal imaging.https://www.mdpi.com/1996-1944/16/7/2566chalcogenide glassthermal diffusiongradient refractive indexRaman spectrumelectron probe |
| spellingShingle | Yan Kang Jin Wang Yongkun Zhao Xudong Zhao Haizheng Tao Yinsheng Xu High Refractive Index GRIN Lens for IR Optics Materials chalcogenide glass thermal diffusion gradient refractive index Raman spectrum electron probe |
| title | High Refractive Index GRIN Lens for IR Optics |
| title_full | High Refractive Index GRIN Lens for IR Optics |
| title_fullStr | High Refractive Index GRIN Lens for IR Optics |
| title_full_unstemmed | High Refractive Index GRIN Lens for IR Optics |
| title_short | High Refractive Index GRIN Lens for IR Optics |
| title_sort | high refractive index grin lens for ir optics |
| topic | chalcogenide glass thermal diffusion gradient refractive index Raman spectrum electron probe |
| url | https://www.mdpi.com/1996-1944/16/7/2566 |
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