Through strategic engineering of component composition and energy band alignment, 1D core–shell nanostructures can be precisely designed as suitable radial heterostructures to confine the optical field and regulate carrier transport. These core–shell structures synergistically integrate and extend the functionalities of individual materials or devices. By integrating a p-type narrow-band Se material with an n-ZnO core, a 1D ZnO/Se core–shell radial heterojunction is fabricated for a self-powered broadband photodetector (PD). This 1D ZnO/Se core–shell radial heterostructure exhibits there main advantages: 1) forming a radial channel to make carriers transport more efficiently; 2) improving the efficiency of carrier transport and collection by introducing the high conductivity of Se layer; 3) passivating the surface defects of ZnO by Se shell layer. As a result, this core–shell radial heterojunction demonstrates high responsivity and detectivity across UV to visible light spectrum, with fast photoresponse times of 377/532 µs for rise/decay. These results revealed the superiority of 1D core–shell radial heterojunction in high-performance PDs, showing great potential for application in the development of advance optoelectronic devices.
{"title":"1D Core–Shell Radial Heterojunction for High-Performance and Self-Powered Broadband Photodetector","authors":"Yi Ma, Wendong Lu, Wanyu Wang, Fumeng Zhang, Xiaoyu Xie, Zengliang Shi, Xiaoxuan Wang, Chunxiang Xu","doi":"10.1002/lpor.202402234","DOIUrl":"https://doi.org/10.1002/lpor.202402234","url":null,"abstract":"Through strategic engineering of component composition and energy band alignment, 1D core–shell nanostructures can be precisely designed as suitable radial heterostructures to confine the optical field and regulate carrier transport. These core–shell structures synergistically integrate and extend the functionalities of individual materials or devices. By integrating a <i>p</i>-type narrow-band Se material with an <i>n</i>-ZnO core, a 1D ZnO/Se core–shell radial heterojunction is fabricated for a self-powered broadband photodetector (PD). This 1D ZnO/Se core–shell radial heterostructure exhibits there main advantages: 1) forming a radial channel to make carriers transport more efficiently; 2) improving the efficiency of carrier transport and collection by introducing the high conductivity of Se layer; 3) passivating the surface defects of ZnO by Se shell layer. As a result, this core–shell radial heterojunction demonstrates high responsivity and detectivity across UV to visible light spectrum, with fast photoresponse times of 377/532 µs for rise/decay. These results revealed the superiority of 1D core–shell radial heterojunction in high-performance PDs, showing great potential for application in the development of advance optoelectronic devices.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"16 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Bin Wang, Jiahuan Ren, Shaoxian Huang, Xuekai Ma, Wei Dang, Chunling Gu, Cunbin An, Xiaohui Zhao, Qing Liao
The polarization or spin manipulation of photons attracts significant attention in modern photonics. However, the severe dispersion of photons in planar microcavities inevitably leads to difficulties in achieving wavelength-dependent photonic spin operation. In this study, pseudo-spin manipulation of polariton condensates in an organic crystal-filled microcavity is achieved, confirmed by the corresponding emitted polarized light. By adjusting the incident wavevector of the off-resonant pumping laser, the energies and polarizations of polariton condensates can be continuously manipulated. Surprisingly, the individual left-handed or right-handed circularly polarized condensates can be selectively emerged at the specific wavevectors of the incident laser along a specific direction of the organic crystal. This spin manipulation of polariton condensates holds significant implications in optoelectronics, particularly in the exploration of topological photonics and chiral optics in the strong light-matter coupling regime.
{"title":"Polarization Manipulation of Polariton Condensates in Organic Microcavities","authors":"Bin Wang, Jiahuan Ren, Shaoxian Huang, Xuekai Ma, Wei Dang, Chunling Gu, Cunbin An, Xiaohui Zhao, Qing Liao","doi":"10.1002/lpor.202402217","DOIUrl":"https://doi.org/10.1002/lpor.202402217","url":null,"abstract":"The polarization or spin manipulation of photons attracts significant attention in modern photonics. However, the severe dispersion of photons in planar microcavities inevitably leads to difficulties in achieving wavelength-dependent photonic spin operation. In this study, pseudo-spin manipulation of polariton condensates in an organic crystal-filled microcavity is achieved, confirmed by the corresponding emitted polarized light. By adjusting the incident wavevector of the off-resonant pumping laser, the energies and polarizations of polariton condensates can be continuously manipulated. Surprisingly, the individual left-handed or right-handed circularly polarized condensates can be selectively emerged at the specific wavevectors of the incident laser along a specific direction of the organic crystal. This spin manipulation of polariton condensates holds significant implications in optoelectronics, particularly in the exploration of topological photonics and chiral optics in the strong light-matter coupling regime.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"35 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
We present two designs of perfect meta-absorbers (PMAs) utilizing metallic plasmonic grating, and they have resonances with ultranarrow bandwidth in the order of nanometers and great surface electric field enhancement through the coupling resonance of surface plasmon polaritons (SPPs) and grating surface waves. Notably, the grating-coupled plasmonic resonance demonstrates pronounced incident angle dependence and ambient refractive index sensitiveness. Meanwhile, its dependencies are almost linearly controlled. PMA with metal-metal grating (MMG) structure has period-dependent angular sensitivity and shows a refractive index sensitivity of 4.0039 µm/RIU that maximum figure of merit (FOM) value is 2300 RIU−1 under normal incident light. The sensitivities are 3.6514 µm/RIU and 4.3486 µm/RIU and FOM values are 2783 RIU−1 and 3941 RIU−1 for two different resonances under oblique incidence of 5°. Another design of PMA with metal-insulator-metal grating (MIMG) structure has both grating-coupled SPP and localized surface plasmon (LSP) modes, and it can achieve single-frequency resonance scanning in the spectral region from wavelengths of 3 µm to 5 µm by changing the incident angle or ambient refractive index. Finally, a reconfigurable PMA achieves the active regulation of the irradiation angle and can simultaneously realize the functions of tuning, angular sensing and refractive index sensing and so on.
{"title":"Reconfigurable MEMS-based Perfect Meta-absorber with Ultrahigh-Q and Angle-dependent Characteristics for Sensing Applications","authors":"Kunye Li, Xi Li, Yu-Sheng Lin","doi":"10.1002/lpor.202500288","DOIUrl":"https://doi.org/10.1002/lpor.202500288","url":null,"abstract":"We present two designs of perfect meta-absorbers (PMAs) utilizing metallic plasmonic grating, and they have resonances with ultranarrow bandwidth in the order of nanometers and great surface electric field enhancement through the coupling resonance of surface plasmon polaritons (SPPs) and grating surface waves. Notably, the grating-coupled plasmonic resonance demonstrates pronounced incident angle dependence and ambient refractive index sensitiveness. Meanwhile, its dependencies are almost linearly controlled. PMA with metal-metal grating (MMG) structure has period-dependent angular sensitivity and shows a refractive index sensitivity of 4.0039 µm/RIU that maximum figure of merit (FOM) value is 2300 RIU<sup>−1</sup> under normal incident light. The sensitivities are 3.6514 µm/RIU and 4.3486 µm/RIU and FOM values are 2783 RIU<sup>−1</sup> and 3941 RIU<sup>−1</sup> for two different resonances under oblique incidence of 5°. Another design of PMA with metal-insulator-metal grating (MIMG) structure has both grating-coupled SPP and localized surface plasmon (LSP) modes, and it can achieve single-frequency resonance scanning in the spectral region from wavelengths of 3 µm to 5 µm by changing the incident angle or ambient refractive index. Finally, a reconfigurable PMA achieves the active regulation of the irradiation angle and can simultaneously realize the functions of tuning, angular sensing and refractive index sensing and so on.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"35 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Andrei Ushkov, Pavel Bezrukov, Denis Kolchanov, Andrey Machnev, Pavel Ginzburg
Thermo-optical therapeutic approaches offer precise temperature control using light, opening new possibilities in targeted drug delivery, cancer therapy, and tissue engineering. Compared to traditional single-function plasmonic particles, mesoporous metamaterial-like nanostructures can operate in the infrared spectrum, matching the biological transparency window, while also acting as carriers for therapeutic agents. This study explores the thermo-optical characteristics of golden vaterite, a mesoporous calcium carbonate loaded with gold nanoparticles, forming a metamaterial capsule. Heating capabilities of individual particles are measured in an optical trap, where local temperature is derived from stochastic dynamics influenced by temperature-dependent viscosity. A calibration step or the use of tabulated data enables accurate mapping between irradiated power and particle temperature. Four sets of particles with varying gold content are tested, demonstrating temperature increases of up to several tens of degrees with milliwatt-scale infrared continuous-wave lasers. Heating efficiencies (𝑑𝑇/𝑑𝑃) as high as 30 °C mW−1 are observed. Additionally, optomechanical tools with microfluidic features allowed efficient prototyping of thermo-optical agents without fluorescent markers. Golden vaterite, capable of both thermal and optical functions, presents a versatile platform for developing theranostic particles for heat-based optical applications and targeted therapeutic delivery.
{"title":"Golden Vaterite as a Thermo-Optical Agent","authors":"Andrei Ushkov, Pavel Bezrukov, Denis Kolchanov, Andrey Machnev, Pavel Ginzburg","doi":"10.1002/lpor.202500461","DOIUrl":"https://doi.org/10.1002/lpor.202500461","url":null,"abstract":"Thermo-optical therapeutic approaches offer precise temperature control using light, opening new possibilities in targeted drug delivery, cancer therapy, and tissue engineering. Compared to traditional single-function plasmonic particles, mesoporous metamaterial-like nanostructures can operate in the infrared spectrum, matching the biological transparency window, while also acting as carriers for therapeutic agents. This study explores the thermo-optical characteristics of golden vaterite, a mesoporous calcium carbonate loaded with gold nanoparticles, forming a metamaterial capsule. Heating capabilities of individual particles are measured in an optical trap, where local temperature is derived from stochastic dynamics influenced by temperature-dependent viscosity. A calibration step or the use of tabulated data enables accurate mapping between irradiated power and particle temperature. Four sets of particles with varying gold content are tested, demonstrating temperature increases of up to several tens of degrees with milliwatt-scale infrared continuous-wave lasers. Heating efficiencies (𝑑𝑇/𝑑𝑃) as high as 30 °C mW<sup>−1</sup> are observed. Additionally, optomechanical tools with microfluidic features allowed efficient prototyping of thermo-optical agents without fluorescent markers. Golden vaterite, capable of both thermal and optical functions, presents a versatile platform for developing theranostic particles for heat-based optical applications and targeted therapeutic delivery.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"57 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Forward-stimulated Brillouin scattering (FSBS) in optical waveguides is a nonlinear optical effect that involves the acousto-optic interaction between co-propagating light and guided acoustic waves, showcasing significant potential for applications in integrated photonic and sensing fields. However, the resonance frequency of guided acoustic waves stimulated by FSBS is highly sensitive to fluctuations in ambient temperature, leading to uncertainty in the frequency evaluation of the FSBS system. Herein, the novel mechanism of “athermal FSBS” is proposed, where the resonance frequency remains unaffected by temperature variations. Through simulation and experimentation, the FSBS spectra characteristics of aluminum-coated optical fiber are demonstrated to be insensitive to temperature fluctuations when the ratio of the radius of the silica to the thickness of the aluminum is ≈2.21; at this point, the temperature dependence of the acoustic velocity of the aluminum coating is precisely counterbalanced with that of the cladding material. Meanwhile, this research confirms that the temperature property of the central frequency of FSBS spectra in aluminum-coated fibers can be controlled by modulating the optomechanical interaction. Thermally stabilized aluminized waveguides are expected to be utilized in athermal fiber lasers, filters, and on-chip silicon waveguides, thereby advancing the progression of FSBS in the integrated photonics domain.
{"title":"Athermal Forward Stimulated Brillouin Scattering","authors":"Yuli Ren, Tianfu Li, Ruogu Wang, Hongwei Li, Dexin Ba, Yongkang Dong","doi":"10.1002/lpor.202402071","DOIUrl":"https://doi.org/10.1002/lpor.202402071","url":null,"abstract":"Forward-stimulated Brillouin scattering (FSBS) in optical waveguides is a nonlinear optical effect that involves the acousto-optic interaction between co-propagating light and guided acoustic waves, showcasing significant potential for applications in integrated photonic and sensing fields. However, the resonance frequency of guided acoustic waves stimulated by FSBS is highly sensitive to fluctuations in ambient temperature, leading to uncertainty in the frequency evaluation of the FSBS system. Herein, the novel mechanism of “athermal FSBS” is proposed, where the resonance frequency remains unaffected by temperature variations. Through simulation and experimentation, the FSBS spectra characteristics of aluminum-coated optical fiber are demonstrated to be insensitive to temperature fluctuations when the ratio of the radius of the silica to the thickness of the aluminum is ≈2.21; at this point, the temperature dependence of the acoustic velocity of the aluminum coating is precisely counterbalanced with that of the cladding material. Meanwhile, this research confirms that the temperature property of the central frequency of FSBS spectra in aluminum-coated fibers can be controlled by modulating the optomechanical interaction. Thermally stabilized aluminized waveguides are expected to be utilized in athermal fiber lasers, filters, and on-chip silicon waveguides, thereby advancing the progression of FSBS in the integrated photonics domain.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"58 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
A major research objective across various fields is to represent the response of open systems using quasinormal mode (QNM) expansions, akin to the treatment of normal modes in closed systems. In electromagnetism, QNM expansions effectively describe modal physics inside resonators and in their near field. However, challenges arise in the intermediate and far field, where QNM fields grow exponentially, posing mathematical issues and often being considered unphysical. How can a near-field relevant concept lose its validity? Where does this transition occur? This perspective seeks to answer these questions by analyzing foundational concepts such as cavity perturbation theory and dissipative coupling using model problems. The analysis reveals no fundamental inconsistencies with exponential growth and sometimes yields surprising results, such as an increase in coupling coefficients between QNMs of two distant bodies as separation increases. These findings should be widely shared to prevent misunderstandings and enhance the understanding of contemporary electromagnetic QNM theories. The final section, intended for experts in electromagnetic QNMs, provides a thorough analysis of these theories.
{"title":"Reflections on the Spatial Exponential Growth of Electromagnetic Quasinormal Modes","authors":"Tong Wu, José Luis Jaramillo, Philippe Lalanne","doi":"10.1002/lpor.202402133","DOIUrl":"https://doi.org/10.1002/lpor.202402133","url":null,"abstract":"A major research objective across various fields is to represent the response of open systems using quasinormal mode (QNM) expansions, akin to the treatment of normal modes in closed systems. In electromagnetism, QNM expansions effectively describe modal physics inside resonators and in their near field. However, challenges arise in the intermediate and far field, where QNM fields grow exponentially, posing mathematical issues and often being considered unphysical. How can a near-field relevant concept lose its validity? Where does this transition occur? This perspective seeks to answer these questions by analyzing foundational concepts such as cavity perturbation theory and dissipative coupling using model problems. The analysis reveals no fundamental inconsistencies with exponential growth and sometimes yields surprising results, such as an increase in coupling coefficients between QNMs of two distant bodies as separation increases. These findings should be widely shared to prevent misunderstandings and enhance the understanding of contemporary electromagnetic QNM theories. The final section, intended for experts in electromagnetic QNMs, provides a thorough analysis of these theories.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"20 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Shiqi Lan, Li Han, Chenyu Yao, Shijian Tian, Libo Zhang, Mengjie Jiang, Xiaokai Pan, Yingdong Wei, Yichong Zhang, Kaixuan Zhang, Huaizhong Xing, Xiaoshuang Chen, Lin Wang
The advancement of terahertz technology is primarily fueled by the imperative for room-temperature operation with high sensitivity, high integration, and broadband detection capabilities. Nevertheless, the traditional semiconductor materials in terahertz detectors continue to grapple with obstacles, notably intricate integration and processing complexities. The unique electronic structures and non-trivial topological properties of two-dimensional topological materials bring new possibilities and perspectives for high-performance terahertz low-energy photon detection. Here, an antenna combined with the topological insulator GeBi4Te7 and an ultrashort channel integration technique is utilized to significantly enhance the electromagnetic response in a confined region by compressing and localizing the optical field in the spatial dimension. This strategy achieves a preferential flow of hot carriers through enhanced light-matter interactions while satisfying the enhanced bandwidth and response speed of the detector. The sensitivity of the detector is 3.04 A·W−1 at 0.81 THz with a noise equivalent power of less than 15.8 pW·Hz−0.5 and a response time of less than 5 µs. These research results provide a brand-new opportunity to develop highly sensitive, highly integrated, and broadband terahertz detectors, enabling exploration across a diverse array of application domains.
{"title":"Sub-Skin-Depth Nanoslit Integrated Topological Insulator Devices for Self-Driven Broadband Terahertz Detection and Imaging","authors":"Shiqi Lan, Li Han, Chenyu Yao, Shijian Tian, Libo Zhang, Mengjie Jiang, Xiaokai Pan, Yingdong Wei, Yichong Zhang, Kaixuan Zhang, Huaizhong Xing, Xiaoshuang Chen, Lin Wang","doi":"10.1002/lpor.202402091","DOIUrl":"https://doi.org/10.1002/lpor.202402091","url":null,"abstract":"The advancement of terahertz technology is primarily fueled by the imperative for room-temperature operation with high sensitivity, high integration, and broadband detection capabilities. Nevertheless, the traditional semiconductor materials in terahertz detectors continue to grapple with obstacles, notably intricate integration and processing complexities. The unique electronic structures and non-trivial topological properties of two-dimensional topological materials bring new possibilities and perspectives for high-performance terahertz low-energy photon detection. Here, an antenna combined with the topological insulator GeBi<sub>4</sub>Te<sub>7</sub> and an ultrashort channel integration technique is utilized to significantly enhance the electromagnetic response in a confined region by compressing and localizing the optical field in the spatial dimension. This strategy achieves a preferential flow of hot carriers through enhanced light-matter interactions while satisfying the enhanced bandwidth and response speed of the detector. The sensitivity of the detector is 3.04 A·W<sup>−1</sup> at 0.81 THz with a noise equivalent power of less than 15.8 pW·Hz<sup>−0.5</sup> and a response time of less than 5 µs. These research results provide a brand-new opportunity to develop highly sensitive, highly integrated, and broadband terahertz detectors, enabling exploration across a diverse array of application domains.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"13 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Next-generation high-luminance laser lighting faces a crucial challenge in developing a transmissive color converter with efficient heat dissipation and phosphor conversion. Herein, a unique architecture of Al2O3 particles gradient doping phosphor-in-glass film (PiGF) coated on a transparent sapphire (AGD-PiGF@S) is designed and prepared by a simple multilayer printing and low-temperature sintering strategy. By optimizing the multilayer gradient doping structure, the 9-0%AGD-PiGF@S converter enables a high-luminance white light with a high luminous flux (LF) of 2996 lm under a maximum laser power density saturation threshold (LPD-ST) of 19 W mm−2, which is 2.63 times of the traditional PiGF@S converter with a LF of 1139 lm@11 W mm−2. The working temperature of this AGD-PiGF@S converter is decreased by 35.8°C@11 W mm−2 (≈23.82%). Compared with the Al2O3 uniform doping PiGF@S (4.5%AUD-PiGF@S) converter, the maximum LF and luminous efficiency (LE) of AGD-PiGF@S are increased by 58.18% and 33.20%, respectively. The findings will provide a new idea for realizing the preferably color converter in high-luminance laser lighting and display.
{"title":"Unique Multilayer Gradient Design of Al2O3 Doping Phosphor-In-Glass Film Enabling High-Luminance Laser Lighting","authors":"Zhencheng Li, Jiuzhou Zhao, Yongjie Ding, Hongjin Zhang, Zhenyu Chen, Zhenzi Wu, Yufan Wei, Feng Wu, Changqing Chen, Yang Peng, Jiangnan Dai","doi":"10.1002/lpor.202401991","DOIUrl":"https://doi.org/10.1002/lpor.202401991","url":null,"abstract":"Next-generation high-luminance laser lighting faces a crucial challenge in developing a transmissive color converter with efficient heat dissipation and phosphor conversion. Herein, a unique architecture of Al<sub>2</sub>O<sub>3</sub> particles gradient doping phosphor-in-glass film (PiGF) coated on a transparent sapphire (AGD-PiGF@S) is designed and prepared by a simple multilayer printing and low-temperature sintering strategy. By optimizing the multilayer gradient doping structure, the 9-0%AGD-PiGF@S converter enables a high-luminance white light with a high luminous flux (LF) of 2996 lm under a maximum laser power density saturation threshold (LPD-ST) of 19 W mm<sup>−2</sup>, which is 2.63 times of the traditional PiGF@S converter with a LF of 1139 lm@11 W mm<sup>−2</sup>. The working temperature of this AGD-PiGF@S converter is decreased by 35.8°C@11 W mm<sup>−2</sup> (≈23.82%). Compared with the Al<sub>2</sub>O<sub>3</sub> uniform doping PiGF@S (4.5%AUD-PiGF@S) converter, the maximum LF and luminous efficiency (LE) of AGD-PiGF@S are increased by 58.18% and 33.20%, respectively. The findings will provide a new idea for realizing the preferably color converter in high-luminance laser lighting and display.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"183 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Bismuth telluride (Bi2Te3) topological insulator (TI) presents excellent photothermoelectric characteristics with promising applications in photonic detection, catalysis, and sensing. Exploring effective approaches to enhance the photothermal and photocurrent response in the Bi2Te3 TI films is particularly significant for improving the photodetection capacity. Herein, the generation of an optical effect analogous to Tamm plasmons is experimentally and numerically demonstrated by integrating the Bi2Te3 TI nanofilm onto a 1D photonic crystal (PC). The Bi2Te3/PC multilayer enables the distinct enhancement of near-infrared light absorption and photothermal effect of Bi2Te3 nanofilm based on the TI-based optical Tamm state. The measured results reveal that the reflection spectrum of Bi2Te3 nanofilm on the PC exhibits a distinct dip, whose position has a redshift with increasing the thickness of Bi2Te3 film. The numerical and theoretical calculations agree well with the experiments. The reflection dip stems from the formation of the TI-based Tamm state, whose wavelength exhibits a slight blueshift with the increase of temperature. The zero-bias photocurrent conversion of Bi2Te3 nanofilm can be obviously self-reinforced with impinging light on the Bi2Te3/PC structure at the Tamm state wavelength. The results pave a new avenue for enhancing light-TI interactions and their applications in high-performance near-infrared photodetection devices.
{"title":"Efficient Photothermal and Photocurrent Enhancements in Bi2Te3 Topological Insulator Nanofilm by Integrating with a Photonic Crystal","authors":"Hua Lu, Shouhao Shi, Dikun Li, Shuwen Bo, Jiadeng Zheng, Dong Mao, Yinan Zhang, Xuetao Gan, Jianlin Zhao","doi":"10.1002/lpor.202500033","DOIUrl":"https://doi.org/10.1002/lpor.202500033","url":null,"abstract":"Bismuth telluride (Bi<sub>2</sub>Te<sub>3</sub>) topological insulator (TI) presents excellent photothermoelectric characteristics with promising applications in photonic detection, catalysis, and sensing. Exploring effective approaches to enhance the photothermal and photocurrent response in the Bi<sub>2</sub>Te<sub>3</sub> TI films is particularly significant for improving the photodetection capacity. Herein, the generation of an optical effect analogous to Tamm plasmons is experimentally and numerically demonstrated by integrating the Bi<sub>2</sub>Te<sub>3</sub> TI nanofilm onto a 1D photonic crystal (PC). The Bi<sub>2</sub>Te<sub>3</sub>/PC multilayer enables the distinct enhancement of near-infrared light absorption and photothermal effect of Bi<sub>2</sub>Te<sub>3</sub> nanofilm based on the TI-based optical Tamm state. The measured results reveal that the reflection spectrum of Bi<sub>2</sub>Te<sub>3</sub> nanofilm on the PC exhibits a distinct dip, whose position has a redshift with increasing the thickness of Bi<sub>2</sub>Te<sub>3</sub> film. The numerical and theoretical calculations agree well with the experiments. The reflection dip stems from the formation of the TI-based Tamm state, whose wavelength exhibits a slight blueshift with the increase of temperature. The zero-bias photocurrent conversion of Bi<sub>2</sub>Te<sub>3</sub> nanofilm can be obviously self-reinforced with impinging light on the Bi<sub>2</sub>Te<sub>3</sub>/PC structure at the Tamm state wavelength. The results pave a new avenue for enhancing light-TI interactions and their applications in high-performance near-infrared photodetection devices.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"61 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Optical imaging through highly turbid water (50 NTU) presents significant challenges due to strong photon scattering effect that impedes effective detection of light signal. Using Monte Carlo simulation, it is found that moderate light absorption can improve image quality, while photon scattering is unequivocally detrimental. To achieve clear imaging in highly turbid water, the wavelength of illumination light has been red-shifted from the traditionally utilized blue-green to near-infrared, which has moderate absorption and low scattering. Experimental results demonstrate that near-infrared illumination is helpful to the detection of target while visible illumination causes the loss of target information. This provides a simple optical imaging method for extracting signals from targets in highly turbid water, without the requirement of complex equipment. Furthermore, the negative effect of backscattering background under forward-illumination mode on imaging contrast is confirmed, and the back-illumination mode is proposed to eliminate its interference. Finally, the number and movement of fish are successfully observed in real time through the simulated aquaculture pond, using the near-infrared lateral-illumination, and the research has the potential to be applied in various turbid underwater imaging scenarios.
{"title":"Moderate Absorption and Low Scattering: Near-infrared Illumination for Clear Imaging through Highly Turbid Water","authors":"Yiwen Wang, Peiyang Liu, Tianxiang Wu, Zhe Feng, Ying Liu, Jun Qian","doi":"10.1002/lpor.202402067","DOIUrl":"https://doi.org/10.1002/lpor.202402067","url":null,"abstract":"Optical imaging through highly turbid water (<span data-altimg=\"/cms/asset/3dc6264d-c2b2-41a9-98e5-2fa909dd47a9/lpor202402067-math-0001.png\"></span><mjx-container ctxtmenu_counter=\"1\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\" location=\"graphic/lpor202402067-math-0001.png\"><mjx-semantics><mjx-mo data-semantic- data-semantic-role=\"inequality\" data-semantic-speech=\"greater than\" data-semantic-type=\"relation\"><mjx-c></mjx-c></mjx-mo></mjx-semantics></mjx-math><mjx-assistive-mml display=\"inline\" unselectable=\"on\"><math altimg=\"urn:x-wiley:18638880:media:lpor202402067:lpor202402067-math-0001\" display=\"inline\" location=\"graphic/lpor202402067-math-0001.png\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><semantics><mo data-semantic-=\"\" data-semantic-role=\"inequality\" data-semantic-speech=\"greater than\" data-semantic-type=\"relation\">></mo>$>$</annotation></semantics></math></mjx-assistive-mml></mjx-container>50 NTU) presents significant challenges due to strong photon scattering effect that impedes effective detection of light signal. Using Monte Carlo simulation, it is found that moderate light absorption can improve image quality, while photon scattering is unequivocally detrimental. To achieve clear imaging in highly turbid water, the wavelength of illumination light has been red-shifted from the traditionally utilized blue-green to near-infrared, which has moderate absorption and low scattering. Experimental results demonstrate that near-infrared illumination is helpful to the detection of target while visible illumination causes the loss of target information. This provides a simple optical imaging method for extracting signals from targets in highly turbid water, without the requirement of complex equipment. Furthermore, the negative effect of backscattering background under forward-illumination mode on imaging contrast is confirmed, and the back-illumination mode is proposed to eliminate its interference. Finally, the number and movement of fish are successfully observed in real time through the simulated aquaculture pond, using the near-infrared lateral-illumination, and the research has the potential to be applied in various turbid underwater imaging scenarios.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"57 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
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