Microlaser arrays play important roles in a variety of cutting‐edge photonic applications. Organic Raman gain materials hold great promise to achieve continuous‐wave (c.w.) microlaser arrays toward compact laser displays. However, due to the high degrees of freedom of molecular self‐assembly, current organic microcrystal arrays suffer from random sizes and orientations, which goes against uniform Raman laser emission toward laser displays. Herein, a strongly constrained self‐assembly method is reported to synthesize homogeneous organic microcrystal arrays providing uniform full‐color c.w. Raman laser emission for laser displays. The strongly constrained self‐assembly method enables strict control of molecular self‐assembly, producing homogeneous organic microcrystal arrays. The single‐component microcrystal arrays support c.w. operation and uniform outputs of single‐mode blue, green, and red Raman lasing. The microcrystal Raman laser arrays exhibit excellent color expression and display capabilities. This work lays the foundation for developing c.w. organic microlaser arrays toward laser displays.
{"title":"Continuous‐Wave Organic Raman Microlaser Arrays for Laser Displays","authors":"Xiaolong Liu, Haidi Liu, Tongjin Zhang, Kang Wang, Jiannian Yao, Haiyun Dong, Yong Sheng Zhao","doi":"10.1002/adom.202401105","DOIUrl":"https://doi.org/10.1002/adom.202401105","url":null,"abstract":"Microlaser arrays play important roles in a variety of cutting‐edge photonic applications. Organic Raman gain materials hold great promise to achieve continuous‐wave (c.w.) microlaser arrays toward compact laser displays. However, due to the high degrees of freedom of molecular self‐assembly, current organic microcrystal arrays suffer from random sizes and orientations, which goes against uniform Raman laser emission toward laser displays. Herein, a strongly constrained self‐assembly method is reported to synthesize homogeneous organic microcrystal arrays providing uniform full‐color c.w. Raman laser emission for laser displays. The strongly constrained self‐assembly method enables strict control of molecular self‐assembly, producing homogeneous organic microcrystal arrays. The single‐component microcrystal arrays support c.w. operation and uniform outputs of single‐mode blue, green, and red Raman lasing. The microcrystal Raman laser arrays exhibit excellent color expression and display capabilities. This work lays the foundation for developing c.w. organic microlaser arrays toward laser displays.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jaume R. Otaegui, Yannick Bertschy, Lorenzo Vallan, Falko Schmidt, Adarsh Vasista, Jose Garcia‐Guirado, Claudio Roscini, Romain Quidant, Jordi Hernando
Phase change materials (PCM) have greatly contributed to optics with applications ranging from rewritable memories to smart windows. This is possible thanks to the variation in optical properties that PCMs undergo upon thermally‐induced phase change. However, this behavior is accompanied by a loss of optical transparency in one (or more) of their phases, posing a major limitation for transmission‐based functionalities. Here this challenge is addressed by producing PCM‐based composites that remain transparent in the visible spectrum during their phase transition. The cornerstone of this innovative material is the use of 30 nm‐in‐size nanoparticles of paraffin as PCMs, which minimizes the scattering within the polymer host matrix regardless of the paraffin's phase. To demonstrate the potential of this approach, it is shown that thin composite layers can modulate the phase of the incident visible light using temperature, achieving uniform phase profiles with maximum phase shifts up to π radians. Notably, the composites studied exhibit up to threefold larger phase changes for the same input power over reference thermo‐optical materials like polydimethylsiloxane. These findings position paraffin‐based composites as promising materials for various thermo‐optical applications, including wavefront shaping and aberration correction, with the potential to significantly impact a variety of optical technologies.
{"title":"Light Phase Modulation with Transparent Paraffin‐Based Phase Change Materials","authors":"Jaume R. Otaegui, Yannick Bertschy, Lorenzo Vallan, Falko Schmidt, Adarsh Vasista, Jose Garcia‐Guirado, Claudio Roscini, Romain Quidant, Jordi Hernando","doi":"10.1002/adom.202401008","DOIUrl":"https://doi.org/10.1002/adom.202401008","url":null,"abstract":"Phase change materials (PCM) have greatly contributed to optics with applications ranging from rewritable memories to smart windows. This is possible thanks to the variation in optical properties that PCMs undergo upon thermally‐induced phase change. However, this behavior is accompanied by a loss of optical transparency in one (or more) of their phases, posing a major limitation for transmission‐based functionalities. Here this challenge is addressed by producing PCM‐based composites that remain transparent in the visible spectrum during their phase transition. The cornerstone of this innovative material is the use of 30 nm‐in‐size nanoparticles of paraffin as PCMs, which minimizes the scattering within the polymer host matrix regardless of the paraffin's phase. To demonstrate the potential of this approach, it is shown that thin composite layers can modulate the phase of the incident visible light using temperature, achieving uniform phase profiles with maximum phase shifts up to π radians. Notably, the composites studied exhibit up to threefold larger phase changes for the same input power over reference thermo‐optical materials like polydimethylsiloxane. These findings position paraffin‐based composites as promising materials for various thermo‐optical applications, including wavefront shaping and aberration correction, with the potential to significantly impact a variety of optical technologies.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hong Chen, Mao‐Yin Ran, Sheng‐Hua Zhou, Xin‐Tao Wu, Hua Lin
Diamond‐like (DL) metal chalcogenides have attracted significant attention in recent years because of their complex structural compositions and exceptional nonlinear optical (NLO) capabilities in the infrared (IR) range. Despite notable advancements in this field, there is still a lack of systematic research on high‐performance and simply composed IR‐NLO chalcogenides with DL structures. In this study, the insightful structural characteristics and IR‐NLO properties of a ternary Ag‐based chalcogenide Ag2GeS3 are investigated for the first time at both experimental and theoretical levels. The compound belongs to the non‐centrosymmetric Cmc21 space group (No.36) and displays a 3D DL structure comprising highly oriented [AgS4] and [GeS4] tetrahedra. Due to its distinct structure, the compound may produce significant second harmonic generation (SHG) response (5.6 × AgGaS2 at 2050 nm), the biggest value reported among Ag‐based IR‐NLO chalcogenides to date, and phase matchability in the IR range with a calculated birefringence of Δn = 0.09 at 2050 nm. According to theoretical calculations, the combined impacts of the distorted [AgS4] and [GeS4] NLO‐active motifs inside the 3D DL framework provide the SHG tensor d24 of Ag2GeS3 at 51.9 pm V−1 at 2050 nm. The prospective uses of Ag2GeS3 in the field of IR‐NLO are highlighted in this work.
{"title":"Ag2GeS3: A Diamond‐Like Chalcogenide as an IR Nonlinear Optical Material with Outstanding Second‐Harmonic Generation Response","authors":"Hong Chen, Mao‐Yin Ran, Sheng‐Hua Zhou, Xin‐Tao Wu, Hua Lin","doi":"10.1002/adom.202401100","DOIUrl":"https://doi.org/10.1002/adom.202401100","url":null,"abstract":"Diamond‐like (DL) metal chalcogenides have attracted significant attention in recent years because of their complex structural compositions and exceptional nonlinear optical (NLO) capabilities in the infrared (IR) range. Despite notable advancements in this field, there is still a lack of systematic research on high‐performance and simply composed IR‐NLO chalcogenides with DL structures. In this study, the insightful structural characteristics and IR‐NLO properties of a ternary Ag‐based chalcogenide Ag<jats:sub>2</jats:sub>GeS<jats:sub>3</jats:sub> are investigated for the first time at both experimental and theoretical levels. The compound belongs to the non‐centrosymmetric <jats:italic>Cmc</jats:italic>2<jats:sub>1</jats:sub> space group (No.36) and displays a 3D DL structure comprising highly oriented [AgS<jats:sub>4</jats:sub>] and [GeS<jats:sub>4</jats:sub>] tetrahedra. Due to its distinct structure, the compound may produce significant second harmonic generation (SHG) response (5.6 × AgGaS<jats:sub>2</jats:sub> at 2050 nm), the biggest value reported among Ag‐based IR‐NLO chalcogenides to date, and phase matchability in the IR range with a calculated birefringence of Δ<jats:italic>n</jats:italic> = 0.09 at 2050 nm. According to theoretical calculations, the combined impacts of the distorted [AgS<jats:sub>4</jats:sub>] and [GeS<jats:sub>4</jats:sub>] NLO‐active motifs inside the 3D DL framework provide the SHG tensor <jats:italic>d</jats:italic><jats:sub>24</jats:sub> of Ag<jats:sub>2</jats:sub>GeS<jats:sub>3</jats:sub> at 51.9 pm V<jats:sup>−1</jats:sup> at 2050 nm. The prospective uses of Ag<jats:sub>2</jats:sub>GeS<jats:sub>3</jats:sub> in the field of IR‐NLO are highlighted in this work.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qinglong Jia, Changchang Bo, Ziyi Lu, Wensheng Xu, Jiayi Liu, Li Gao, Ligong Chen, Bowei Wang
Despite the extensive research on room temperature phosphorescent (RTP) materials, it remains a great challenge to further improve the photophysical properties of RTP materials. In this study, the RTP emission of guest molecule is significantly enhanced by constructing binary matrices containing cyanuric acid (CA) and amino‐containing compounds. Systematic studies show that the strong interaction between the two components of binary matrix induced variations in the guest molecular configuration and excited state electron distribution, thus facilitating the production of more triplet excitons. Furthermore, the binary matrix also exhibits stronger domain‐limiting effect compared to the CA mono‐matrix, effectively inhibits the energy loss of triplet excitons due to quenching and non‐radiative transitions. The prepared binary matrix RTP materials present ultralong phosphorescence lifetime and high phosphorescence quantum yield (up to 3.21 s and 7.31%, respectively), and even achieve bright RTP emission in a variety of organic solvents and aqueous media. Moreover, the RTP emission intensity of the best binary matrix composite can reach more than 28 times that of the CA mono‐matrix composite, and the RTP lifetime can be extended by 1.51 s.
{"title":"Construction of Binary Matrix for Efficient Room Temperature Phosphorescence Emission","authors":"Qinglong Jia, Changchang Bo, Ziyi Lu, Wensheng Xu, Jiayi Liu, Li Gao, Ligong Chen, Bowei Wang","doi":"10.1002/adom.202401270","DOIUrl":"https://doi.org/10.1002/adom.202401270","url":null,"abstract":"Despite the extensive research on room temperature phosphorescent (RTP) materials, it remains a great challenge to further improve the photophysical properties of RTP materials. In this study, the RTP emission of guest molecule is significantly enhanced by constructing binary matrices containing cyanuric acid (CA) and amino‐containing compounds. Systematic studies show that the strong interaction between the two components of binary matrix induced variations in the guest molecular configuration and excited state electron distribution, thus facilitating the production of more triplet excitons. Furthermore, the binary matrix also exhibits stronger domain‐limiting effect compared to the CA mono‐matrix, effectively inhibits the energy loss of triplet excitons due to quenching and non‐radiative transitions. The prepared binary matrix RTP materials present ultralong phosphorescence lifetime and high phosphorescence quantum yield (up to 3.21 s and 7.31%, respectively), and even achieve bright RTP emission in a variety of organic solvents and aqueous media. Moreover, the RTP emission intensity of the best binary matrix composite can reach more than 28 times that of the CA mono‐matrix composite, and the RTP lifetime can be extended by 1.51 s.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Malini Abraham, K. K. Thejas, Arup K. Kunti, Nuño Amador‐Mendez, Roberto Hernandez, J. Duras, K. G. Nishanth, Sushanta Kumar Sahoo, Maria Tchernycheva, Subrata Das
Red‐emitting nanophosphors have a multirole in improvising the next‐generation bulk/micro/nano‐level lighting devices, particularly in refining white light quality and device performance. Nonetheless, it is difficult to synthesize nanosized phosphors with good yield and paralleled high absorption efficiency both in UV and blue regions, which is critical for modern lighting. Herein, new Mg14Ge4.99+σO24‐x+δFx: Mn4+ red nanoparticles with sizes below 100 nm are designed to improve not only the luminescence but also the blue light absorption. This approach has validated the applicability of red‐emitting nanophosphors into flexible UV and blue nitride nanowire light‐emitting‐diodes (LEDs), and commercial bulk LEDs, for the first time, with boosted intensity and color superiority for a variety of lighting utilizations. For these phosphor LEDs (pc‐LEDs), optimized red nanophosphor with an external quantum efficiency of ≈44.5%, color purity of ≈100%, and thermal stability of ≈72% at 150 °C is used. The optimized nanophosphor is combined with a flexible UV‐AlGaN/GaN nanowire LED and a blue‐InGaN/GaN‐LED. The resultant devices show promising red electroluminescence without any degradation at elevated currents. Finally, several unfamiliar LED packaging is designed with yellow and red phosphors implemented on 2 sets of double LED units to reach CRI > 85. The re‐premeditated LED packages are useful for high‐definition lighting.
红色发光纳米荧光粉在改进下一代体/微/纳米级照明设备方面具有多重作用，特别是在改善白光质量和设备性能方面。然而，很难合成出产量高、同时在紫外和蓝光区域具有高吸收效率的纳米级荧光粉，而这对现代照明至关重要。在此，新型 Mg14Ge4.99+σO24-x+δFx：Mn4+ 红色纳米粒子，其尺寸低于 100 纳米，不仅能提高发光性能，还能改善蓝光吸收。这种方法首次验证了红色发光纳米荧光粉在柔性紫外和蓝色氮化物纳米线发光二极管（LED）以及商用散装 LED 中的适用性，并提高了各种照明用途的强度和色彩优势。这些荧光粉 LED（pc-LED）使用了优化的红色纳米荧光粉，其外部量子效率≈44.5%，颜色纯度≈100%，150 °C时的热稳定性≈72%。优化后的纳米荧光粉与柔性 UV-AlGaN/GaN 纳米线 LED 和蓝色 InGaN/GaN-LED 相结合。由此产生的器件在高电流条件下显示出良好的红色电致发光性能，且无任何劣化现象。最后，设计了几种陌生的 LED 封装，在两组双 LED 单元上使用黄色和红色荧光粉，使 CRI 达到 85。经过重新设计的 LED 封装可用于高清照明。
{"title":"Strategically Developed Strong Red‐Emitting Oxyfluoride Nanophosphors for Next‐Generation Lighting Applications","authors":"Malini Abraham, K. K. Thejas, Arup K. Kunti, Nuño Amador‐Mendez, Roberto Hernandez, J. Duras, K. G. Nishanth, Sushanta Kumar Sahoo, Maria Tchernycheva, Subrata Das","doi":"10.1002/adom.202401356","DOIUrl":"https://doi.org/10.1002/adom.202401356","url":null,"abstract":"Red‐emitting nanophosphors have a multirole in improvising the next‐generation bulk/micro/nano‐level lighting devices, particularly in refining white light quality and device performance. Nonetheless, it is difficult to synthesize nanosized phosphors with good yield and paralleled high absorption efficiency both in UV and blue regions, which is critical for modern lighting. Herein, new Mg<jats:sub>14</jats:sub>Ge<jats:sub>4.99+σ</jats:sub>O<jats:sub>24‐x+δ</jats:sub>F<jats:sub>x</jats:sub>: Mn<jats:sup>4+</jats:sup> red nanoparticles with sizes below 100 nm are designed to improve not only the luminescence but also the blue light absorption. This approach has validated the applicability of red‐emitting nanophosphors into flexible UV and blue nitride nanowire light‐emitting‐diodes (LEDs), and commercial bulk LEDs, for the first time, with boosted intensity and color superiority for a variety of lighting utilizations. For these phosphor LEDs (pc‐LEDs), optimized red nanophosphor with an external quantum efficiency of ≈44.5%, color purity of ≈100%, and thermal stability of ≈72% at 150 °C is used. The optimized nanophosphor is combined with a flexible UV‐AlGaN/GaN nanowire LED and a blue‐InGaN/GaN‐LED. The resultant devices show promising red electroluminescence without any degradation at elevated currents. Finally, several unfamiliar LED packaging is designed with yellow and red phosphors implemented on 2 sets of double LED units to reach CRI > 85. The re‐premeditated LED packages are useful for high‐definition lighting.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Andreas Hohenau, Matthieu Bugnet, Viktor Kapetanovic, Guillaume Radtke, Gianluigi A. Botton, Nikita Reichelt, Ulrich Hohenester, Joachim R. Krenn, Leïla Boubekeur‐Lecaque, Nordin Félidj
Narrow gaps between coupled plasmonic nano‐particles show strong optical field enhancements and spectrally adjustable resonance positions, making them attractive for surface enhanced spectroscopies. Gold nanorod dimers formed from nanorod solutions with narrow size distributions are intensely investigated in this context. However, the binding angle of rods coupled at their end faces is usually not controllable. Surprisingly, it is observed that this has only little effect on field enhancement and resonance energies. In this work, gold nanorod dimers are investigated by mapping their plasmon resonances using electron energy‐loss spectroscopy in a scanning transmission electron microscope. For a wide range of dimer orientations, a negligible influence of the angle between the two rods on the bonding and antibonding longitudinal dipole resonances is confirmed, in good agreement with numerical simulations. The results are interpreted via the predominant end‐coupling of the individual nanorod's plasmonic modes, as illustrated by an analytical charge coupling model. In addition, the simulations emphasize that conclusions from experimental data on the gap morphology on the size range of one nanometer can be ambiguous. In any case, the full understanding of the angle‐invariant resonances of nano‐rod dimers can further promote their controlled application in surface enhanced spectroscopy or ‐sensing.
{"title":"Binding Angle Robustness of Plasmonic Nanorod Dimer Resonances","authors":"Andreas Hohenau, Matthieu Bugnet, Viktor Kapetanovic, Guillaume Radtke, Gianluigi A. Botton, Nikita Reichelt, Ulrich Hohenester, Joachim R. Krenn, Leïla Boubekeur‐Lecaque, Nordin Félidj","doi":"10.1002/adom.202400929","DOIUrl":"https://doi.org/10.1002/adom.202400929","url":null,"abstract":"Narrow gaps between coupled plasmonic nano‐particles show strong optical field enhancements and spectrally adjustable resonance positions, making them attractive for surface enhanced spectroscopies. Gold nanorod dimers formed from nanorod solutions with narrow size distributions are intensely investigated in this context. However, the binding angle of rods coupled at their end faces is usually not controllable. Surprisingly, it is observed that this has only little effect on field enhancement and resonance energies. In this work, gold nanorod dimers are investigated by mapping their plasmon resonances using electron energy‐loss spectroscopy in a scanning transmission electron microscope. For a wide range of dimer orientations, a negligible influence of the angle between the two rods on the bonding and antibonding longitudinal dipole resonances is confirmed, in good agreement with numerical simulations. The results are interpreted via the predominant end‐coupling of the individual nanorod's plasmonic modes, as illustrated by an analytical charge coupling model. In addition, the simulations emphasize that conclusions from experimental data on the gap morphology on the size range of one nanometer can be ambiguous. In any case, the full understanding of the angle‐invariant resonances of nano‐rod dimers can further promote their controlled application in surface enhanced spectroscopy or ‐sensing.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The multi‐dimensional light‐field manipulation capability of metasurfaces positions them as promising candidates for displaying nanoprinting and holographic images at ultra‐short distances with subwavelength resolution. In recent years, merging nanoprinting and holographic images into a single‐layer metasurface has emerged as a research focus to enhance information storage capacity. However, existing multi‐channel metasurface designs often limit the number of polarization states available for the holographic image. Here, a scheme is proposed and demonstrated to encode both a continuous grayscale image and a vectorial hologram with a continuously varying linear polarization distribution onto a complex amplitude‐modulated metasurface. The nanoprinting and holographic images generated from dielectric metasurface exhibit broadband response for the visible light. This method paves the way for compact optical devices tailored for applications in information encoding, high‐density optical storage, and information anti‐counterfeiting.
{"title":"Broadband Complex Amplitude‐Modulated Metasurfaces for Nanoprinting and Vectorial Hologram with Continuously Varying Linear Polarization Distributions","authors":"Song Zhang, Peicheng Lin, Pengcheng Huo, Yilin Wang, Yanzeng Zhang, Mingze Liu, Ting Xu","doi":"10.1002/adom.202401227","DOIUrl":"https://doi.org/10.1002/adom.202401227","url":null,"abstract":"The multi‐dimensional light‐field manipulation capability of metasurfaces positions them as promising candidates for displaying nanoprinting and holographic images at ultra‐short distances with subwavelength resolution. In recent years, merging nanoprinting and holographic images into a single‐layer metasurface has emerged as a research focus to enhance information storage capacity. However, existing multi‐channel metasurface designs often limit the number of polarization states available for the holographic image. Here, a scheme is proposed and demonstrated to encode both a continuous grayscale image and a vectorial hologram with a continuously varying linear polarization distribution onto a complex amplitude‐modulated metasurface. The nanoprinting and holographic images generated from dielectric metasurface exhibit broadband response for the visible light. This method paves the way for compact optical devices tailored for applications in information encoding, high‐density optical storage, and information anti‐counterfeiting.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Metasurface structures have proven to be effective in enhancing terahertz sensing signals and can thus be used as sensors to improve terahertz detection sensitivity. However, the sensitivity is limited by the poor spatial overlap between the analytes and the local electric field of the metasurface. In this work, a novel design of a floating bilayer metasurface structure for terahertz sensing is proposed and investigated. This structure supports a sharp toroidal dipole resonance and can concentrate near‐field energy on the analyte and metal atoms rather than on the substrate surface by floating the metal atoms. Consequently, the sensitivity is significantly improved to as high as 362 GHz RIU−1; theoretically, this is approximately 2.6 times higher than that of the common metasurface. The ability of the floating bilayer metasurface to quantitatively detect chlorothalonil is experimentally demonstrated. The resonance peak shows a significant frequency shift of 7 GHz for a change of 0.0001 mg dL−1 in chlorothalonil concentration, reaching up to 86 GHz when the change in chlorothalonil concentration is 100 mg dL−1; this is approximately 6.6 times higher than that of the common metasurface. This work provides opportunities for metasurface to realize ultrasensitive sensing in the terahertz regime.
{"title":"Terahertz Sensing Based on Floating Bilayer Metasurface with Toroidal Dipole Resonance Toward Ultra‐High Sensitivity","authors":"Xiaoxuan Liu, Binggang Xiao, Jianyuan Qin","doi":"10.1002/adom.202400785","DOIUrl":"https://doi.org/10.1002/adom.202400785","url":null,"abstract":"Metasurface structures have proven to be effective in enhancing terahertz sensing signals and can thus be used as sensors to improve terahertz detection sensitivity. However, the sensitivity is limited by the poor spatial overlap between the analytes and the local electric field of the metasurface. In this work, a novel design of a floating bilayer metasurface structure for terahertz sensing is proposed and investigated. This structure supports a sharp toroidal dipole resonance and can concentrate near‐field energy on the analyte and metal atoms rather than on the substrate surface by floating the metal atoms. Consequently, the sensitivity is significantly improved to as high as 362 GHz RIU<jats:sup>−1</jats:sup>; theoretically, this is approximately 2.6 times higher than that of the common metasurface. The ability of the floating bilayer metasurface to quantitatively detect chlorothalonil is experimentally demonstrated. The resonance peak shows a significant frequency shift of 7 GHz for a change of 0.0001 mg dL<jats:sup>−1</jats:sup> in chlorothalonil concentration, reaching up to 86 GHz when the change in chlorothalonil concentration is 100 mg dL<jats:sup>−1</jats:sup>; this is approximately 6.6 times higher than that of the common metasurface. This work provides opportunities for metasurface to realize ultrasensitive sensing in the terahertz regime.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jindou Shi, Zeyu Wang, Luxia Xu, Junnan Wang, Zheyuan Da, Chen Zhang, Yongqiang Ji, Qing Yao, Youlong Xu, Nikolai V. Gaponenko, Jinshou Tian, Minqiang Wang
Pb‐free double‐perovskite (DP) scintillators are highly promising candidates for X‐ray imaging because of their superior optoelectronic properties, low toxicity, and high stability. However, practical applications require Pb‐free DP crystals to be ground and mixed with polymers to produce scintillator films. Grinding can compromise film uniformity and optical properties, thereby affecting imaging resolution. In this study, an in situ fabrication strategy is proposed to facilitate the crystalline growth of Pb‐free Cs2AgInxBi1‐xCl6 micron sheets in polymethyl methacrylate in a single step. By adjusting the In3+/Bi3+ ratio, Cs2AgIn0.9Bi0.1Cl6/PMMA composite films (CFs) with excellent scintillation properties are obtained, including a light yield of up to 32000 photons per MeV and an X‐ray detection limit of 87 nGyairs−1. This strategy also enabled the production of large Cs2AgIn0.9Bi0.1Cl6/PMMA CFs, which demonstrated favorable flexibility and stability, fabricating products with advanced eligibility for commercial applications. The CFs exhibited outstanding performances in X‐ray imaging, producing high‐resolution structures and providing a new avenue for the development of Pb‐free DP materials in fields such as medical imaging and safety detection.
{"title":"In Situ Growth of Lead‐Free Double Perovskite Micron Sheets in Polymethyl Methacrylate for X‐Ray Imaging","authors":"Jindou Shi, Zeyu Wang, Luxia Xu, Junnan Wang, Zheyuan Da, Chen Zhang, Yongqiang Ji, Qing Yao, Youlong Xu, Nikolai V. Gaponenko, Jinshou Tian, Minqiang Wang","doi":"10.1002/adom.202400691","DOIUrl":"https://doi.org/10.1002/adom.202400691","url":null,"abstract":"Pb‐free double‐perovskite (DP) scintillators are highly promising candidates for X‐ray imaging because of their superior optoelectronic properties, low toxicity, and high stability. However, practical applications require Pb‐free DP crystals to be ground and mixed with polymers to produce scintillator films. Grinding can compromise film uniformity and optical properties, thereby affecting imaging resolution. In this study, an in situ fabrication strategy is proposed to facilitate the crystalline growth of Pb‐free Cs<jats:sub>2</jats:sub>AgIn<jats:sub>x</jats:sub>Bi<jats:sub>1‐x</jats:sub>Cl<jats:sub>6</jats:sub> micron sheets in polymethyl methacrylate in a single step. By adjusting the In<jats:sup>3+</jats:sup>/Bi<jats:sup>3+</jats:sup> ratio, Cs<jats:sub>2</jats:sub>AgIn<jats:sub>0.9</jats:sub>Bi<jats:sub>0.1</jats:sub>Cl<jats:sub>6</jats:sub>/PMMA composite films (CFs) with excellent scintillation properties are obtained, including a light yield of up to 32000 photons per MeV and an X‐ray detection limit of 87 nGy<jats:sub>air</jats:sub>s<jats:sup>−1</jats:sup>. This strategy also enabled the production of large Cs<jats:sub>2</jats:sub>AgIn<jats:sub>0.9</jats:sub>Bi<jats:sub>0.1</jats:sub>Cl<jats:sub>6</jats:sub>/PMMA CFs, which demonstrated favorable flexibility and stability, fabricating products with advanced eligibility for commercial applications. The CFs exhibited outstanding performances in X‐ray imaging, producing high‐resolution structures and providing a new avenue for the development of Pb‐free DP materials in fields such as medical imaging and safety detection.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ultrafast vortex beams have significant scientific and practical value because of their unique phase properties in both the longitudinal and transverse modes, enabling multi‐dimensional quantum control of light fields. Directly generating watt‐level ultrafast vortex beams with large angular momentum has remained a major challenge due to the limitations of mode‐locked materials and existing spatiotemporal mode‐locking generation methods. In this study, quasi‐2D PEA2(CsPbBr3)n‐1PbBr4 perovskite films are prepared by an anti‐solvent method and employed for the first time in a mode‐locked resonator operating in free space. Utilizing the angle‐based non‐collinear pumping and frequency doubling techniques, the second‐order ultrafast green vortex beams with a power of up to 1.05 W and a duration of 373 ps are generated. Experimental findings demonstrate the strong nonlinear saturable absorption properties of quasi‐2D PEA2(CsPbBr3)n‐1PbBr4 perovskite films at high power levels, highlighting their considerable potential in ultrafast laser technology and nonlinear optics.
{"title":"Watt‐Level Second‐Order Topological Charge Ultrafast Green Vortex Laser with Quasi ‐2D PEA2(CsPbBr3)n‐1PbBr4 Perovskite Films Saturable Absorber","authors":"Zehua Liu, Jingzhen Li, Ling Zhang, Yu Zhang, Song Yang, Zhenxu Bai, Yulei Wang, Zhiwei Lu, Dapeng Yan, Yaoyao Qi, XingWang Zhang","doi":"10.1002/adom.202401165","DOIUrl":"https://doi.org/10.1002/adom.202401165","url":null,"abstract":"Ultrafast vortex beams have significant scientific and practical value because of their unique phase properties in both the longitudinal and transverse modes, enabling multi‐dimensional quantum control of light fields. Directly generating watt‐level ultrafast vortex beams with large angular momentum has remained a major challenge due to the limitations of mode‐locked materials and existing spatiotemporal mode‐locking generation methods. In this study, quasi‐2D PEA<jats:sub>2</jats:sub>(CsPbBr<jats:sub>3</jats:sub>)<jats:sub>n‐1</jats:sub>PbBr<jats:sub>4</jats:sub> perovskite films are prepared by an anti‐solvent method and employed for the first time in a mode‐locked resonator operating in free space. Utilizing the angle‐based non‐collinear pumping and frequency doubling techniques, the second‐order ultrafast green vortex beams with a power of up to 1.05 W and a duration of 373 ps are generated. Experimental findings demonstrate the strong nonlinear saturable absorption properties of quasi‐2D PEA<jats:sub>2</jats:sub>(CsPbBr<jats:sub>3</jats:sub>)<jats:sub>n‐1</jats:sub>PbBr<jats:sub>4</jats:sub> perovskite films at high power levels, highlighting their considerable potential in ultrafast laser technology and nonlinear optics.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":null,"pages":null},"PeriodicalIF":9.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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