Optics and Laser Technology最新文献

英文中文

An advanced ultraviolet nanosecond pulsed laser cleaning oceanic micro-biofouling from steel surface

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.optlastec.2025.112618

Yao Lu , Tongguang Jin , Jianan Xu , Yang Wang , LiJun Yang

An advanced nanosecond ultraviolet (UV) laser is innovatively conducted in cleaning micro biofoulings from the AH36 steel substrate surface. Natural micro biofoulings are formed utilizing a seawater immersion method. The field emission scanning electron microscopy (SEM) in conjunction with energy dispersive spectroscopy (EDS), digital ultra-depth-of-field microscope and optical profiler (OP) are adopted to evaluate the morphologies, topologies, and chemical compositions correspondingly. The surface wettability properties of UV laser cleaned surface are characterized by contact angle meter, which indicates that the created surfaces even possess superhydrophobic properties (163.5°) at the laser fluence of 6 J/cm². The results indicate that a laser fluence of 6 J/cm² illuminates outstanding cleaning effectiveness, topography height 25 μm and a surface roughness of 4.132 μm respectively. Furthermore, a tailored one-dimensional heat conduction model is developed according to the UV laser cleaning micro biofouling. Based on the Beer-Lambert law, the calculated cleaning threshold of the micro biofouling is 2.4 J/cm². The cleaning efficiency is approximately 58.4

\times

10^-6 m³/h at the laser fluence of 8 J/cm². This study elaborates briefly the interaction mechanism of UV laser cleaning micro biofouling surface and provides practical guidance for maritime industries applications.

{"title":"An advanced ultraviolet nanosecond pulsed laser cleaning oceanic micro-biofouling from steel surface","authors":"Yao Lu , Tongguang Jin , Jianan Xu , Yang Wang , LiJun Yang","doi":"10.1016/j.optlastec.2025.112618","DOIUrl":"10.1016/j.optlastec.2025.112618","url":null,"abstract":"<div><div>An advanced nanosecond ultraviolet (UV) laser is innovatively conducted in cleaning micro biofoulings from the AH36 steel substrate surface. Natural micro biofoulings are formed utilizing a seawater immersion method. The field emission scanning electron microscopy (SEM) in conjunction with energy dispersive spectroscopy (EDS), digital ultra-depth-of-field microscope and optical profiler (OP) are adopted to evaluate the morphologies, topologies, and chemical compositions correspondingly. The surface wettability properties of UV laser cleaned surface are characterized by contact angle meter, which indicates that the created surfaces even possess superhydrophobic properties (163.5°) at the laser fluence of 6 J/cm<sup>2</sup>. The results indicate that a laser fluence of 6 J/cm<sup>2</sup> illuminates outstanding cleaning effectiveness, topography height 25 μm and a surface roughness of 4.132 μm respectively. Furthermore, a tailored one-dimensional heat conduction model is developed according to the UV laser cleaning micro biofouling. Based on the Beer-Lambert law, the calculated cleaning threshold of the micro biofouling is 2.4 J/cm<sup>2</sup>. The cleaning efficiency is approximately 58.4 <span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>-6</sup> m<sup>3</sup>/h at the laser fluence of 8 J/cm<sup>2</sup>. This study elaborates briefly the interaction mechanism of UV laser cleaning micro biofouling surface and provides practical guidance for maritime industries applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112618"},"PeriodicalIF":4.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Free-space extraction of ultra-long anti-diffracting light beam with multiple polarization modes

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.optlastec.2025.112597

Yu Miao , Lingyu Wang , Kailing Yao , Mingzhu Xu , Xiumin Gao , Xiaoyu Weng , Songlin Zhuang

Polarization modulation, the key to human-driven light, plays an important role in determining imaging resolution and contrast, the capacity and security of optical communications, as well as the precision of target detection and recognition. However, customizing multiple polarization modes within a single beam simultaneously and specifically remains a challenge. To address this issue, we developed a method to extract tunable polarization modes along the trajectories of ultra-long anti-diffracting Airy beams with multiple energy oscillations from an m-order vector vortex beam. This approach allows for the arbitrary definition and switching of multiple on-demand polarization mode along the propagation direction (z-direction) using mode extraction and an optical pen without altering the polarization state of the incident beam. Without superimposing at least two incident polarization modes, polarization modes in different transmission trajectories can be extracted directly from the high-order vector vortex beam based on the principle on mode extraction. The number, position, amplitude and phase of polarization mode can further be arranged in an arbitrary manner with the aid of optical pen. The tunable polarization modes along the z-direction are of particular interest to researchers in the fields of particle trapping, large-depth imaging, optical communication, electronics and acoustics.

{"title":"Free-space extraction of ultra-long anti-diffracting light beam with multiple polarization modes","authors":"Yu Miao , Lingyu Wang , Kailing Yao , Mingzhu Xu , Xiumin Gao , Xiaoyu Weng , Songlin Zhuang","doi":"10.1016/j.optlastec.2025.112597","DOIUrl":"10.1016/j.optlastec.2025.112597","url":null,"abstract":"<div><div>Polarization modulation, the key to human-driven light, plays an important role in determining imaging resolution and contrast, the capacity and security of optical communications, as well as the precision of target detection and recognition. However, customizing multiple polarization modes within a single beam simultaneously and specifically remains a challenge. To address this issue, we developed a method to extract tunable polarization modes along the trajectories of ultra-long anti-diffracting Airy beams with multiple energy oscillations from an m-order vector vortex beam. This approach allows for the arbitrary definition and switching of multiple on-demand polarization mode along the propagation direction (z-direction) using mode extraction and an optical pen without altering the polarization state of the incident beam. Without superimposing at least two incident polarization modes, polarization modes in different transmission trajectories can be extracted directly from the high-order vector vortex beam based on the principle on mode extraction. The number, position, amplitude and phase of polarization mode can further be arranged in an arbitrary manner with the aid of optical pen. The tunable polarization modes along the z-direction are of particular interest to researchers in the fields of particle trapping, large-depth imaging, optical communication, electronics and acoustics.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112597"},"PeriodicalIF":4.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on improving the performance of photonic integrated interference imaging systems using wave-shaped microlens array

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112614

Xiaoyan Pan , Zhikun Yang , Rui Jia , Jiaxin Zhao , Hongkun Wang , Ge Ren , Qi Peng

Photonic integrated interference imaging technology is an advanced technique that combines photonic integration and computational optics to achieve ultra-thin, ultra-light, and high-resolution imaging. This paper proposes a novel wave-shaped microlens array, which effectively enables multi-directional coverage of UV spatial frequencies, enhancing the sampling efficiency of frequency information to achieve high-resolution imaging. By optimizing the wavelength spacing of the arrayed waveguide grating (AWG) and the arrangement of the microlens array, the system significantly improves imaging quality and limiting resolution. Simulation results indicate that, under optimal parameters, the system’s performance shows significant improvements compared to the original radial microlens array and the hierarchical multistage microlens array. Specifically, the average peak signal-to-noise ratio (PSNR) increased by 45.07% and 30.52%, the structural similarity index measure (SSIM) improved by 78.54% and 24.35%, and the limiting resolution was enhanced by 27.70% and 8.59%, respectively. This study provides valuable insights for the design and optimization of photonic integrated interference imaging systems.

{"title":"Research on improving the performance of photonic integrated interference imaging systems using wave-shaped microlens array","authors":"Xiaoyan Pan , Zhikun Yang , Rui Jia , Jiaxin Zhao , Hongkun Wang , Ge Ren , Qi Peng","doi":"10.1016/j.optlastec.2025.112614","DOIUrl":"10.1016/j.optlastec.2025.112614","url":null,"abstract":"<div><div>Photonic integrated interference imaging technology is an advanced technique that combines photonic integration and computational optics to achieve ultra-thin, ultra-light, and high-resolution imaging. This paper proposes a novel wave-shaped microlens array, which effectively enables multi-directional coverage of UV spatial frequencies, enhancing the sampling efficiency of frequency information to achieve high-resolution imaging. By optimizing the wavelength spacing of the arrayed waveguide grating (AWG) and the arrangement of the microlens array, the system significantly improves imaging quality and limiting resolution. Simulation results indicate that, under optimal parameters, the system’s performance shows significant improvements compared to the original radial microlens array and the hierarchical multistage microlens array. Specifically, the average peak signal-to-noise ratio (PSNR) increased by 45.07% and 30.52%, the structural similarity index measure (SSIM) improved by 78.54% and 24.35%, and the limiting resolution was enhanced by 27.70% and 8.59%, respectively. This study provides valuable insights for the design and optimization of photonic integrated interference imaging systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112614"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High color rendering index white laser light source based on RGBY four primary colors

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112610

Bowen Liu , Wenming Yao , Yuhang Sun , Yawei Zhang , Chuanbin Sun , Xingchen Lin , Xuanlan Xue , Huidan Zhang , Zijian Wang , Hongbo Zhu

The white laser light source, renowned for its high energy concentration, superior color rendering, and exceptional luminosity, is poised to become a leading choice for next-generation lighting and display technologies. This research presents the synthesis of a superior white laser light source, leveraging RGBY (red, green, blue, and yellow) four-primary-color laser components and advanced wavelength beam combining techniques. The synthesized white laser exhibits a color temperature of 6642 K and a color rendering index (CRI) of 90, Compared to the white light source synthesized using the traditional three-primary-color semiconductor laser method, the color rendering index has seen a significant improvement. The deviation from the standard white light D65 in color temperature is less than 2.1 %. The inclusion of a yellow laser component is critical, effectively bridging the spectral gap and enhancing spectral continuity, thereby significantly improving CRI. This work substantiates the efficacy of four-primary-color semiconductor lasers in white laser synthesis, particularly beneficial for premium lighting and high-definition display applications. It offers novel perspectives on laser utilization in solid-state lighting advancements.

{"title":"High color rendering index white laser light source based on RGBY four primary colors","authors":"Bowen Liu , Wenming Yao , Yuhang Sun , Yawei Zhang , Chuanbin Sun , Xingchen Lin , Xuanlan Xue , Huidan Zhang , Zijian Wang , Hongbo Zhu","doi":"10.1016/j.optlastec.2025.112610","DOIUrl":"10.1016/j.optlastec.2025.112610","url":null,"abstract":"<div><div>The white laser light source, renowned for its high energy concentration, superior color rendering, and exceptional luminosity, is poised to become a leading choice for next-generation lighting and display technologies. This research presents the synthesis of a superior white laser light source, leveraging RGBY (red, green, blue, and yellow) four-primary-color laser components and advanced wavelength beam combining techniques. The synthesized white laser exhibits a color temperature of 6642 K and a color rendering index (CRI) of 90, Compared to the white light source synthesized using the traditional three-primary-color semiconductor laser method, the color rendering index has seen a significant improvement. The deviation from the standard white light D65 in color temperature is less than 2.1 %. The inclusion of a yellow laser component is critical, effectively bridging the spectral gap and enhancing spectral continuity, thereby significantly improving CRI. This work substantiates the efficacy of four-primary-color semiconductor lasers in white laser synthesis, particularly beneficial for premium lighting and high-definition display applications. It offers novel perspectives on laser utilization in solid-state lighting advancements.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112610"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication of high aspect ratio and low taper angle micro-holes utilizing complex water-assisted femtosecond laser drilling

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112608

Rui Zhang , Hailong Zhang , Ronghe Ke , Xingsheng Wang

Water-assisted laser drilling has proven to be an effective technique for high-quality micro-holes fabrication. This study introduces an innovative hybrid approach, designated as spray water film and backside flowing water-assisted (SWF-BFWA) femtosecond laser drilling, which integrates the complementary advantages of spray water film-assisted (SWFA) and backside flowing water-assisted (BFWA) technologies. The proposed methodology combines the high processing efficiency and superior aspect ratio capabilities of SWFA with the excellent geometric precision and minimal taper characteristics inherent to BFWA. A sequential processing strategy was developed, incorporating SWF-BFWA penetration followed by BFWA modification, to achieve micro-holes with both high aspect ratios and low taper angles. To maximize processing efficiency, a single-circular modification trajectory was implemented during the BFWA stage, replacing conventional concentric circle patterns. The influence of laser parameters on modification outcomes was systematically investigated, with optimization of modification factors including the number of modifications, the single-circle diameter of the modification, and the amount of modification defocusing. Experimental results demonstrate that the optimized SWF-BFWA process enables the fabrication of high-quality micro-holes with aspect ratios exceeding 12:1 and taper angles below 0.1°. This investigation provides a comprehensive solution for laser-based fabrication of micro-holes with exceptional dimensional characteristics, offering significant potential for applications requiring high aspect ratios and minimal taper angles.

{"title":"Fabrication of high aspect ratio and low taper angle micro-holes utilizing complex water-assisted femtosecond laser drilling","authors":"Rui Zhang , Hailong Zhang , Ronghe Ke , Xingsheng Wang","doi":"10.1016/j.optlastec.2025.112608","DOIUrl":"10.1016/j.optlastec.2025.112608","url":null,"abstract":"<div><div>Water-assisted laser drilling has proven to be an effective technique for high-quality micro-holes fabrication. This study introduces an innovative hybrid approach, designated as spray water film and backside flowing water-assisted (SWF-BFWA) femtosecond laser drilling, which integrates the complementary advantages of spray water film-assisted (SWFA) and backside flowing water-assisted (BFWA) technologies. The proposed methodology combines the high processing efficiency and superior aspect ratio capabilities of SWFA with the excellent geometric precision and minimal taper characteristics inherent to BFWA. A sequential processing strategy was developed, incorporating SWF-BFWA penetration followed by BFWA modification, to achieve micro-holes with both high aspect ratios and low taper angles. To maximize processing efficiency, a single-circular modification trajectory was implemented during the BFWA stage, replacing conventional concentric circle patterns. The influence of laser parameters on modification outcomes was systematically investigated, with optimization of modification factors including the number of modifications, the single-circle diameter of the modification, and the amount of modification defocusing. Experimental results demonstrate that the optimized SWF-BFWA process enables the fabrication of high-quality micro-holes with aspect ratios exceeding 12:1 and taper angles below 0.1°. This investigation provides a comprehensive solution for laser-based fabrication of micro-holes with exceptional dimensional characteristics, offering significant potential for applications requiring high aspect ratios and minimal taper angles.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112608"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A low-light image enhancement framework based on hybrid multiscale decomposition and adaptive brightness adjustment model

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112621

Yizheng Lang, Yunsheng Qian

Under inadequate lighting conditions, low-light images often suffer from low contrast and poor visibility. However, many existing methods struggle to find a balance between detail enhancement, brightness adjustment, and noise suppression. To address these challenges, this paper proposes a hybrid multiscale decomposition and adaptive brightness adjustment model for low-light image enhancement. By combining local and global contrast enhancement techniques, an adaptive brightness adjustment algorithm is introduced to improve both the brightness and texture details. Furthermore, a hybrid multiscale decomposition model based on guided filtering and side window guided filters is designed to handle the intricate nature of image detail information, which divides the original image into three distinct layers: a base layer representing the background, a large-scale detail layer capturing prominent edge structures, and a small-scale detail layer preserving subtle texture details. To preserve key image details and enhance salient targets, fusion methods based on “exposure” functions and normalized arctan functions are employed. These methods ensure that weak details are preserved while suppressing noise artifacts. Qualitative and quantitative experimental results conducted on public datasets demonstrate that the proposed method surpasses state-of-the-art approaches in terms of detail enhancement, brightness adjustment, and noise suppression.

{"title":"A low-light image enhancement framework based on hybrid multiscale decomposition and adaptive brightness adjustment model","authors":"Yizheng Lang, Yunsheng Qian","doi":"10.1016/j.optlastec.2025.112621","DOIUrl":"10.1016/j.optlastec.2025.112621","url":null,"abstract":"<div><div>Under inadequate lighting conditions, low-light images often suffer from low contrast and poor visibility. However, many existing methods struggle to find a balance between detail enhancement, brightness adjustment, and noise suppression. To address these challenges, this paper proposes a hybrid multiscale decomposition and adaptive brightness adjustment model for low-light image enhancement. By combining local and global contrast enhancement techniques, an adaptive brightness adjustment algorithm is introduced to improve both the brightness and texture details. Furthermore, a hybrid multiscale decomposition model based on guided filtering and side window guided filters is designed to handle the intricate nature of image detail information, which divides the original image into three distinct layers: a base layer representing the background, a large-scale detail layer capturing prominent edge structures, and a small-scale detail layer preserving subtle texture details. To preserve key image details and enhance salient targets, fusion methods based on “exposure” functions and normalized arctan functions are employed. These methods ensure that weak details are preserved while suppressing noise artifacts. Qualitative and quantitative experimental results conducted on public datasets demonstrate that the proposed method surpasses state-of-the-art approaches in terms of detail enhancement, brightness adjustment, and noise suppression.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112621"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ab-Initio based investigation of the optoelectronic, transport, mechanical properties of vacancy-ordered double perovskites A2PtI6 (A = Na, Li): An emerging class of solar cell and thermoelectric materials

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112609

Anjali Kumari , Jisha Annie Abraham , Abhishek Kumar Mishra , Ramesh Sharma , A.M. Alshehri

In this study, the structural, thermoelectric, mechanical, electrical, and optical properties of vacancy-ordered double perovskites A₂PtI₆ (A = Li, Na) have been investigated using density functional theory-based methods. As per the findings, both the materials are stable as confirmed by their calculated formation and cohesive energies. Each compound’s ductility and mechanical stability have been verified. The values of band-gap are computed using dissimilar exchange correlation functions PBE-GGA, mBJ, mBJ + SOC. The results show that A₂PtI₆ (A = Na, Li) are semiconducting material possessing indirect bandgaps having the values of 0.344 eV and 0.347 eVs through PBE-GGA and 0.954 eV and 1.034 eVs by mBJ approximations. After SOC corrections, the band gap values for Li₂PtI₆ and Na₂PtI₆ are found to be 0.820 eV and 0.880 eVs respectively. Similarly, the optical properties like dielectric function, reflectivity, absorption coefficient, loss functions are also computed to explore the optoelectronics applications for these compounds. We also assess the thermoelectric parameters that result in advantageous thermoelectric performance, such as power factors, Seebeck coefficients, and electronic & lattice thermal conductivities. At 1200 K, Li₂PtI₆ and Na₂PtI₆ attain maximum figure of merit (ZT) of 0.58 and 0.50, respectively. These outcomes underscore the materials’ potential for use in thermoelectric devices and solar cells, highlighting their efficacy at high temperatures.

{"title":"Ab-Initio based investigation of the optoelectronic, transport, mechanical properties of vacancy-ordered double perovskites A2PtI6 (A = Na, Li): An emerging class of solar cell and thermoelectric materials","authors":"Anjali Kumari , Jisha Annie Abraham , Abhishek Kumar Mishra , Ramesh Sharma , A.M. Alshehri","doi":"10.1016/j.optlastec.2025.112609","DOIUrl":"10.1016/j.optlastec.2025.112609","url":null,"abstract":"<div><div>In this study, the structural, thermoelectric, mechanical, electrical, and optical properties of vacancy-ordered double perovskites A<sub>2</sub>PtI<sub>6</sub> (A = Li, Na) have been investigated using density functional theory-based methods. As per the findings, both the materials are stable as confirmed by their calculated formation and cohesive energies. Each compound’s ductility and mechanical stability have been verified. The values of band-gap are computed using dissimilar exchange correlation functions PBE-GGA, mBJ, mBJ + SOC. The results show that <em>A</em><sub>2</sub>PtI<sub>6</sub> (<em>A</em> = Na, Li) are semiconducting material possessing indirect bandgaps having the values of 0.344 eV and 0.347 eVs through PBE-GGA and 0.954 eV and 1.034 eVs by mBJ approximations. After SOC corrections, the band gap values for Li<sub>2</sub>PtI<sub>6</sub> and Na<sub>2</sub>PtI<sub>6</sub> are found to be 0.820 eV and 0.880 eVs respectively. Similarly, the optical properties like dielectric function, reflectivity, absorption coefficient, loss functions are also computed to explore the optoelectronics applications for these compounds. We also assess the thermoelectric parameters that result in advantageous thermoelectric performance, such as power factors, Seebeck coefficients, and electronic & lattice thermal conductivities. At 1200 K, Li<sub>2</sub>PtI<sub>6</sub> and Na<sub>2</sub>PtI<sub>6</sub> attain maximum figure of merit (ZT) of 0.58 and 0.50, respectively. These outcomes underscore the materials’ potential for use in thermoelectric devices and solar cells, highlighting their efficacy at high temperatures.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112609"},"PeriodicalIF":4.6,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrically modulated near-field energy transfer between quantum dots and perovskite nanocrystals

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112599

Qasim Khan , Sajid Hussain , Fawad Saeed , Nasrud Din , Rai M Dawood Sultan , Sabad-e- Gul , Lei Wei , Kevin P. Musselman

Electrically controlling resonance energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Cesium lead halide nanocrystals have emerged as a candidate for optoelectronic applications, seamlessly blending the favorable advantages of perovskites and quantum dots. Here, we demonstrate nonradiative energy transfer between CsPbBr₃ nanocrystals and colloidal quantum dots in a heterostructure device. We fabricate devices with semiconducting, chemically synthesised cesium lead bromide (CsPbBr₃) perovskite nanocrystals (PerNCs) as an electrostatically gated donor and core–shell quantum dots (QDs) as an acceptor. With the help of a bottom-gate electrode and hafnium oxide (HfO₂) dielectric layer, the Förster resonance energy transfer (FRET) efficiency can be modulated. Thicknesses of the dielectric, donor, and acceptor layers were fine-tuned and the optimized device configuration exhibits up to 80% modulation of photoluminescence intensity, making it suitable for potential applications in optoelectronic devices and energy conversion.

{"title":"Electrically modulated near-field energy transfer between quantum dots and perovskite nanocrystals","authors":"Qasim Khan , Sajid Hussain , Fawad Saeed , Nasrud Din , Rai M Dawood Sultan , Sabad-e- Gul , Lei Wei , Kevin P. Musselman","doi":"10.1016/j.optlastec.2025.112599","DOIUrl":"10.1016/j.optlastec.2025.112599","url":null,"abstract":"<div><div>Electrically controlling resonance energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Cesium lead halide nanocrystals have emerged as a candidate for optoelectronic applications, seamlessly blending the favorable advantages of perovskites and quantum dots. Here, we demonstrate nonradiative energy transfer between CsPbBr<sub>3</sub> <!-->nanocrystals and colloidal quantum dots in a heterostructure device. We fabricate devices with semiconducting, chemically synthesised cesium lead bromide (CsPbBr<sub>3</sub>) perovskite nanocrystals (PerNCs) as an electrostatically gated donor and core–shell quantum dots (QDs) as an acceptor. With the help of a bottom-gate electrode and hafnium oxide (HfO<sub>2</sub>) dielectric layer, the Förster resonance energy transfer (FRET) efficiency can be modulated. Thicknesses of the dielectric, donor, and acceptor layers were fine-tuned and the optimized device configuration exhibits up to 80% modulation of photoluminescence intensity, making it suitable for potential applications in optoelectronic devices and energy conversion.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112599"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-broadband mid-infrared absorption based on photonic topological transition and anti-reflection effect 基于光子拓扑转变和抗反射效应的超宽带中红外吸收技术

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112607

Haojie Zhang , Xiaotian Chen , Shijia Dong , Bingxue Ye , Ruijia Yang , Yan-Lin Liao , Zhenggen Chen , Yan Zhao

We have developed and experimentally validated an ultra-broadband mid-infrared absorber comprising a periodic Ge/Cr multilayer structure coated with MgF₂ and ZnS films. Simulation studies demonstrate that the absorber’s performance remains robust across different polarizations and angles of incidence. The mechanism behind its ultra-broadband absorption capability stems from the synergistic effects of photonic topological transitions (PTT) and anti-reflection (AR) properties. Experimental results confirm that this absorber achieves an absorptivity exceeding 0.85 across a wide wavelength range from 2000 to 8410 nm. This innovative absorber not only broadens the scope of absorption bandwidths in the mid-infrared region but also holds significant promise for applications in thermal energy harvesting, thermal imaging, and radiation cooling.

引用次数: 0

Improving image quality in holographic near-eye display for variable eye pupil positions and sizes

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112596

Yue Wang , Yuan Liu , Yumeng Su , Qibin Feng , Guoqiang Lv , Zi Wang

In holographic near-eye display, the dynamic changes in the pupil results in the partial and incomplete sampling of the diffracted light wavefront. This paper investigate the influences of pupil position change and size variation based on multiple pupil sub-hologram optimization method. The low reconstruction quality of edge sub-hologram is analyzed and solved by increasing the sampling frequency in the frequency domain. Furthermore, a optimization method based on varying pupil masks is proposed to improve the quality of the observed image when pupil size varies. Simulation and experiment verify that the proposed method effectively improves image quality under varying eye pupil samplings.

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全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

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Optics and Laser Technology

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