Pub Date : 2026-02-09DOI: 10.1021/acsphotonics.5c03087
Chengwei Song,Yiming Wang,Yunyun Ji,Peng Shen,Shiqiang Zhao,Liang Ma,Xianghui Wang,Shengjiang Chang,Fei Fan
Terahertz trace sensing is inherently constrained by weak light-matter interactions. To address this fundamental bottleneck, we propose a novel sensing paradigm based on surface plasmonic (SP) field interference, transitioning from conventional free-space spectroscopic sensing to on-chip surface optical field sensing. Leveraging the extraordinary confinement and focusing capabilities of SP fields, the localized light intensity is substantially enhanced, thereby enhancing the efficiency of light-matter interactions. More importantly, by employing orthogonal slit antenna pairs as coherent surface wavelet sources and a three-stage coherent superposition mechanism, two sets of focused surface waves construct an interferometric field with precisely tunable optical path differences. Ultrasensitive detection is realized through the analysis of focal interference spectra. Experimental validation based on the hydrolysis of acetylcholinesterase demonstrates that the sensing platform attains a detection limit (LOD) as low as 3.125 μg/mL. Furthermore, by fusing 2D surface spectral data with machine-learning algorithms, accurate prediction of enzyme concentrations in the range of 3.125–50 μg/mL is successfully achieved. This work establishes an on-chip precision interferometric sensing technique integrating photonic integration technology and data fusion, representing a breakthrough advancement in the on-chip integration level, detection accuracy, and operational robustness of terahertz sensing systems.
{"title":"On-Chip Terahertz Interferometric Sensing Based on Focused Surface Plasmonic Field and Spatial Spectral Fusion Methodology","authors":"Chengwei Song,Yiming Wang,Yunyun Ji,Peng Shen,Shiqiang Zhao,Liang Ma,Xianghui Wang,Shengjiang Chang,Fei Fan","doi":"10.1021/acsphotonics.5c03087","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c03087","url":null,"abstract":"Terahertz trace sensing is inherently constrained by weak light-matter interactions. To address this fundamental bottleneck, we propose a novel sensing paradigm based on surface plasmonic (SP) field interference, transitioning from conventional free-space spectroscopic sensing to on-chip surface optical field sensing. Leveraging the extraordinary confinement and focusing capabilities of SP fields, the localized light intensity is substantially enhanced, thereby enhancing the efficiency of light-matter interactions. More importantly, by employing orthogonal slit antenna pairs as coherent surface wavelet sources and a three-stage coherent superposition mechanism, two sets of focused surface waves construct an interferometric field with precisely tunable optical path differences. Ultrasensitive detection is realized through the analysis of focal interference spectra. Experimental validation based on the hydrolysis of acetylcholinesterase demonstrates that the sensing platform attains a detection limit (LOD) as low as 3.125 μg/mL. Furthermore, by fusing 2D surface spectral data with machine-learning algorithms, accurate prediction of enzyme concentrations in the range of 3.125–50 μg/mL is successfully achieved. This work establishes an on-chip precision interferometric sensing technique integrating photonic integration technology and data fusion, representing a breakthrough advancement in the on-chip integration level, detection accuracy, and operational robustness of terahertz sensing systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"132 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138829","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}
Pub Date : 2026-02-09DOI: 10.1021/acsphotonics.5c02402
Yiang Sun,Yuxing Li,Zhengda Dong,Hao Ge,Zhongmin Huang,Chuanxiang Sheng,Haibin Zhao,Jie Gu,Jun Wang
Monolayer tungsten disulfide (WS2) is a promising candidate for exploring exciton and trion physics thanks to its strong light-matter interactions and large exciton binding energy at room temperature (RT). Trions, in particular, offer intriguing prospects for optoelectronic and valleytronic applications. However, trion stability at RT and a low excitation density are limited by the inherently low free-electron concentration in monolayer WS2. Here we demonstrate a robust approach to enhance trion emission by constructing a type-II heterostructure between monolayer WS2 and the CsPbBr3 perovskite. Through band engineering, we achieve efficient n-doping of WS2 by electron transfer from CsPbBr3, facilitating a pronounced enhancement of trion emission at RT. Under low-power excitation, trions dominate the photoluminescence (PL) spectra. Time-resolved PL measurements reveal distinct lifetimes of excitons and trions in WS2, perovskites, and heterostructures, confirming the charge-transfer dynamics. Helicity-resolved PL spectra show that trions preserve valley polarization in heterostructures. By integrating this heterostructure into an optical microcavity, we further amplify trion emission via the Purcell effect. Our findings present a viable strategy for achieving stable RT trion emission, advancing the development of transition metal dichalcogenide-perovskite hybrid systems for optoelectronic applications.
{"title":"Room-Temperature Trion Emission Enhancement in Monolayer WS2/CsPbBr3 Perovskite Heterostructures","authors":"Yiang Sun,Yuxing Li,Zhengda Dong,Hao Ge,Zhongmin Huang,Chuanxiang Sheng,Haibin Zhao,Jie Gu,Jun Wang","doi":"10.1021/acsphotonics.5c02402","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02402","url":null,"abstract":"Monolayer tungsten disulfide (WS2) is a promising candidate for exploring exciton and trion physics thanks to its strong light-matter interactions and large exciton binding energy at room temperature (RT). Trions, in particular, offer intriguing prospects for optoelectronic and valleytronic applications. However, trion stability at RT and a low excitation density are limited by the inherently low free-electron concentration in monolayer WS2. Here we demonstrate a robust approach to enhance trion emission by constructing a type-II heterostructure between monolayer WS2 and the CsPbBr3 perovskite. Through band engineering, we achieve efficient n-doping of WS2 by electron transfer from CsPbBr3, facilitating a pronounced enhancement of trion emission at RT. Under low-power excitation, trions dominate the photoluminescence (PL) spectra. Time-resolved PL measurements reveal distinct lifetimes of excitons and trions in WS2, perovskites, and heterostructures, confirming the charge-transfer dynamics. Helicity-resolved PL spectra show that trions preserve valley polarization in heterostructures. By integrating this heterostructure into an optical microcavity, we further amplify trion emission via the Purcell effect. Our findings present a viable strategy for achieving stable RT trion emission, advancing the development of transition metal dichalcogenide-perovskite hybrid systems for optoelectronic applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"24 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138828","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}
Pub Date : 2026-02-09DOI: 10.1021/acsphotonics.5c02076
Rafael S. Dutra,Felipe A. Pinheiro,Diney S. Ether Jr.,Cyriaque Genet,Nathan B. Viana,Paulo A. Maia Neto
We demonstrate that an effect phenomenologically analogous to circular dichroism can arise even for dielectric and isotropic chiral spherical particles. By analyzing the polarimetry of light scattered from a chiral, lossless microsphere illuminated with linearly polarized light, we show that the scattered light becomes nearly circularly polarized, exhibiting large nonresonant values of the Stokes parameter S3 for a broad range of visible frequencies. This phenomenon occurs only in the Mie regime, with the microsphere radius comparable to the wavelength, and provided that the scattered light is collected by a high-NA objective lens, including nonparaxial Fourier components. Altogether, our findings offer a theoretical framework and motivation for an experimental demonstration of a novel chiroptical effect with isolated dielectric particles, with potential applications in enantioselection and characterization of single microparticles, each and every one with its own chiral response.
{"title":"Circular Dichroism without Absorption in Isolated Chiral Dielectric Mie Particles","authors":"Rafael S. Dutra,Felipe A. Pinheiro,Diney S. Ether Jr.,Cyriaque Genet,Nathan B. Viana,Paulo A. Maia Neto","doi":"10.1021/acsphotonics.5c02076","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02076","url":null,"abstract":"We demonstrate that an effect phenomenologically analogous to circular dichroism can arise even for dielectric and isotropic chiral spherical particles. By analyzing the polarimetry of light scattered from a chiral, lossless microsphere illuminated with linearly polarized light, we show that the scattered light becomes nearly circularly polarized, exhibiting large nonresonant values of the Stokes parameter S3 for a broad range of visible frequencies. This phenomenon occurs only in the Mie regime, with the microsphere radius comparable to the wavelength, and provided that the scattered light is collected by a high-NA objective lens, including nonparaxial Fourier components. Altogether, our findings offer a theoretical framework and motivation for an experimental demonstration of a novel chiroptical effect with isolated dielectric particles, with potential applications in enantioselection and characterization of single microparticles, each and every one with its own chiral response.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"3 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138827","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}
Pub Date : 2026-02-08DOI: 10.1021/acsphotonics.5c02733
Paolo Maran,Abhiram Rajan,Francesco Ceccarelli,Roberto Osellame,Petra Paiè,Alessia Candeo,Francesca Bragheri,Andrea Bassi
Advanced optical microscopy techniques, such as structured illumination microscopy (SIM), often rely on precise and complex illumination setups, which can be challenging to implement and maintain. Integrated optics can offer compact, stable, and easy-to-align alternatives, enabling efficient light manipulation for advanced imaging applications. We present an integrated photonic device that generates structured illumination patterns directly within an optical microscope. The device incorporates optical waveguides in a Mach–Zehnder interferometer configuration, generating two separate coherent point sources with controlled amplitudes and phases. When optically conjugated to the pupil plane of a conventional widefield microscope, the device generates sinusoidal illumination patterns in the object plane, which can be translated and modulated via the Mach–Zehnder interferometer. We demonstrate that amplitude modulation enables (i) optical sectioning in HiLo (High and Low Frequency Illumination) microscopy and (ii) controlled structured illumination contrast across multiple wavelengths, making the system adaptable for multicolor SIM. Our results highlight the potential of integrated photonics as a compact and robust approach for advanced microscopy techniques, contributing to the development of simplified, high-resolution structured illumination imaging in biomedical and materials science applications.
{"title":"Amplitude- and Phase-Programmable Dual-Color Photonic Chip for High-Contrast Structured Illumination Microscopy","authors":"Paolo Maran,Abhiram Rajan,Francesco Ceccarelli,Roberto Osellame,Petra Paiè,Alessia Candeo,Francesca Bragheri,Andrea Bassi","doi":"10.1021/acsphotonics.5c02733","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02733","url":null,"abstract":"Advanced optical microscopy techniques, such as structured illumination microscopy (SIM), often rely on precise and complex illumination setups, which can be challenging to implement and maintain. Integrated optics can offer compact, stable, and easy-to-align alternatives, enabling efficient light manipulation for advanced imaging applications. We present an integrated photonic device that generates structured illumination patterns directly within an optical microscope. The device incorporates optical waveguides in a Mach–Zehnder interferometer configuration, generating two separate coherent point sources with controlled amplitudes and phases. When optically conjugated to the pupil plane of a conventional widefield microscope, the device generates sinusoidal illumination patterns in the object plane, which can be translated and modulated via the Mach–Zehnder interferometer. We demonstrate that amplitude modulation enables (i) optical sectioning in HiLo (High and Low Frequency Illumination) microscopy and (ii) controlled structured illumination contrast across multiple wavelengths, making the system adaptable for multicolor SIM. Our results highlight the potential of integrated photonics as a compact and robust approach for advanced microscopy techniques, contributing to the development of simplified, high-resolution structured illumination imaging in biomedical and materials science applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"31 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138839","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}
Pub Date : 2026-02-07DOI: 10.1021/acsphotonics.5c02063
Sinan Genc, Oǧuzhan Yücel, Furkan Aǧlarcı, Carlos Rodriguez-Fernandez, Alpay Yilmaz, Humeyra Caglayan, Serkan Ateş, Alpan Bek
Defect-based quantum emitters in hexagonal boron nitride (hBN) are promising building blocks for scalable quantum photonics due to their stable single-photon emission at room temperature. However, enhancing their emission intensity and controlling the decay dynamics remain significant challenges. This study demonstrates a low-cost, scalable fabrication approach to integrate plasmonic nanocavities with defect-based quantum emitters in hBN nanoflakes. Using the thermal dewetting process, we realize two distinct configurations: stochastic Ag nanoparticles (AgNPs) on hBN flakes and hybrid plasmonic nanocavities formed by AgNPs on top of hBN flakes supported on gold/silicon dioxide (Au/SiO2) substrates. While AgNPs on bare hBN yield up to a 2-fold photoluminescence (PL) enhancement with reduced emitter lifetimes, the hybrid nanocavity architecture provides a dramatic, up to 100-fold PL enhancement and improved uniformity across multiple emitters, all without requiring deterministic positioning. Finite-difference time-domain (FDTD) simulations and time-resolved PL measurements confirm size-dependent control over decay dynamics and cavity–emitter interactions. Our versatile solution overcomes key quantum photonic device development challenges, including material integration, emission intensity optimization, and spectral multiplexity.
{"title":"Disorder-Engineered Hybrid Plasmonic Cavities for Emission Control of Defects in hBN","authors":"Sinan Genc, Oǧuzhan Yücel, Furkan Aǧlarcı, Carlos Rodriguez-Fernandez, Alpay Yilmaz, Humeyra Caglayan, Serkan Ateş, Alpan Bek","doi":"10.1021/acsphotonics.5c02063","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02063","url":null,"abstract":"Defect-based quantum emitters in hexagonal boron nitride (hBN) are promising building blocks for scalable quantum photonics due to their stable single-photon emission at room temperature. However, enhancing their emission intensity and controlling the decay dynamics remain significant challenges. This study demonstrates a low-cost, scalable fabrication approach to integrate plasmonic nanocavities with defect-based quantum emitters in hBN nanoflakes. Using the thermal dewetting process, we realize two distinct configurations: stochastic Ag nanoparticles (AgNPs) on hBN flakes and hybrid plasmonic nanocavities formed by AgNPs on top of hBN flakes supported on gold/silicon dioxide (Au/SiO<sub>2</sub>) substrates. While AgNPs on bare hBN yield up to a 2-fold photoluminescence (PL) enhancement with reduced emitter lifetimes, the hybrid nanocavity architecture provides a dramatic, up to 100-fold PL enhancement and improved uniformity across multiple emitters, all without requiring deterministic positioning. Finite-difference time-domain (FDTD) simulations and time-resolved PL measurements confirm size-dependent control over decay dynamics and cavity–emitter interactions. Our versatile solution overcomes key quantum photonic device development challenges, including material integration, emission intensity optimization, and spectral multiplexity.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"208 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129699","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}
Pub Date : 2026-02-07DOI: 10.1021/acsphotonics.5c02138
Bincheng Wang, Bin Lu, Yong Fu, Xiangyu Tang, Baochang Li, Cheng Jin
Vacuum-ultraviolet (VUV) lasers are critical and foundational tools in scientific research and various industrial applications. Traditional methods for generating VUV lasers involve large, expensive facilities, such as free-electron lasers and synchrotron sources. Recent studies suggest that near-threshold harmonic (NTH) generation offers a viable alternative for creating compact, tabletop sources of femtosecond coherent VUV lasers. However, the relatively low pulse energy limits their broader application. To address this issue, theoretically, a few-cycle, two-color femtosecond laser field is utilized to generate and enhance NTH. This approach allows one to effectively control the excitation of low Rydberg states, significantly increasing the intensity of the VUV laser by 2 orders of magnitude in rarefied gases compared to previous long-duration two-color methods. Additionally, varying the driven laser’s ellipticity and wavelength allows for adjustment of the VUV laser’s ellipticity and wavelength. These findings contribute to the development of femtosecond, high-intensity, ellipticity, and wavelength-adjustable VUV lasers, promising significant advancements in VUV laser technology.
{"title":"Enhancement of Vacuum-Ultraviolet Laser Generation through Near-Threshold Harmonics Driven by a Few-Cycle Two-Color Laser Field","authors":"Bincheng Wang, Bin Lu, Yong Fu, Xiangyu Tang, Baochang Li, Cheng Jin","doi":"10.1021/acsphotonics.5c02138","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02138","url":null,"abstract":"Vacuum-ultraviolet (VUV) lasers are critical and foundational tools in scientific research and various industrial applications. Traditional methods for generating VUV lasers involve large, expensive facilities, such as free-electron lasers and synchrotron sources. Recent studies suggest that near-threshold harmonic (NTH) generation offers a viable alternative for creating compact, tabletop sources of femtosecond coherent VUV lasers. However, the relatively low pulse energy limits their broader application. To address this issue, theoretically, a few-cycle, two-color femtosecond laser field is utilized to generate and enhance NTH. This approach allows one to effectively control the excitation of low Rydberg states, significantly increasing the intensity of the VUV laser by 2 orders of magnitude in rarefied gases compared to previous long-duration two-color methods. Additionally, varying the driven laser’s ellipticity and wavelength allows for adjustment of the VUV laser’s ellipticity and wavelength. These findings contribute to the development of femtosecond, high-intensity, ellipticity, and wavelength-adjustable VUV lasers, promising significant advancements in VUV laser technology.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"23 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129671","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}
Pub Date : 2026-02-07DOI: 10.1021/acsphotonics.5c01558
Qiao Zhang, Bijun Zhao, Jipeng Chen, Yingke Ji, Ruijuan Tian, Liang Liu, Jianguo Wang, Feng Guo, Jie Wang, Chenyang Zhao, Xiangye Liu, Jianlin Zhao, Xuetao Gan
Significant research efforts have focused on developing novel optoelectronic devices utilizing two-dimensional (2D) transition-metal dichalcogenides (TMDs), motivated by their strong light–matter interactions and unique material properties. Photodetectors simultaneously achieving high-speed and high-responsivity performance are particularly crucial for applications such as high-data-rate interconnects operating at telecom wavelengths. However, the intrinsically limited carrier mobilities in TMDs present a fundamental bottleneck for a high-speed operation. Here, we demonstrate high-performance monolayer MoS2 photodetectors fabricated via chemical vapor deposition (CVD) and monolithically integrated with a dielectric waveguide. The Au–MoS2–Au device architecture minimizes carrier transit path lengths while exploiting the short lifetime of hot electrons, yielding a measured bandwidth of ∼3.28 GHz. Concurrently, the device achieves a high responsivity of 144 mA W–1 at 1529.3 nm, attributed to an integrated tapered-waveguide design that significantly enhances the light–matter interaction region. This in situ synergistic integration of wafer-scale CVD-grown TMDs with planar, etch-free photonic circuits establishes a versatile platform for realizing high-performance on-chip optoelectronic devices.
{"title":"High-Speed, High-Responsivity on-Chip Monolayer MoS2 Photodetector at Telecom Wavelengths","authors":"Qiao Zhang, Bijun Zhao, Jipeng Chen, Yingke Ji, Ruijuan Tian, Liang Liu, Jianguo Wang, Feng Guo, Jie Wang, Chenyang Zhao, Xiangye Liu, Jianlin Zhao, Xuetao Gan","doi":"10.1021/acsphotonics.5c01558","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c01558","url":null,"abstract":"Significant research efforts have focused on developing novel optoelectronic devices utilizing two-dimensional (2D) transition-metal dichalcogenides (TMDs), motivated by their strong light–matter interactions and unique material properties. Photodetectors simultaneously achieving high-speed and high-responsivity performance are particularly crucial for applications such as high-data-rate interconnects operating at telecom wavelengths. However, the intrinsically limited carrier mobilities in TMDs present a fundamental bottleneck for a high-speed operation. Here, we demonstrate high-performance monolayer MoS<sub>2</sub> photodetectors fabricated via chemical vapor deposition (CVD) and monolithically integrated with a dielectric waveguide. The Au–MoS<sub>2</sub>–Au device architecture minimizes carrier transit path lengths while exploiting the short lifetime of hot electrons, yielding a measured bandwidth of ∼3.28 GHz. Concurrently, the device achieves a high responsivity of 144 mA W<sup>–</sup><sup>1</sup> at 1529.3 nm, attributed to an integrated tapered-waveguide design that significantly enhances the light–matter interaction region. This in situ synergistic integration of wafer-scale CVD-grown TMDs with planar, etch-free photonic circuits establishes a versatile platform for realizing high-performance on-chip optoelectronic devices.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129697","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}
Pub Date : 2026-02-07DOI: 10.1021/acsphotonics.5c02407
Yingyu Guo,Zhongqiang Chen,Miao Cai,Zuanming Jin,Xuefeng Wang,Chao Zhang,Alexei V. Balakin,Alexander P. Shkurinov,Yan Peng,Yiming Zhu,Songlin Zhuang
Topological materials featuring spin-momentum-locked surface states and high spin-to-charge conversion (SCC) efficiency represent ideal alternatives to the nonmagnetic layer in conventional ferromagnetic (FM)/nonmagnetic spintronic terahertz (THz) emitters. In this study, we utilized time-domain THz emission spectroscopy (TES) to investigate the free-space THz radiation characteristics of the type-II topological Dirac semimetal PdTe2/PdTe and CoFeB/PdTe2/PdTe heterostructures. The contributions of ultrafast demagnetization induced charge current (UDC) and nonlinear photocurrents were distinguished by modulating the external magnetic field and the polarization state of the excitation laser. Experimental analysis reveals that the UDC of CoFeB/PdTe2/PdTe acts as the primary mechanism for THz generation, whereas the nonlinear effects within the PdTe2/PdTe heterostructure enable the additional polarization-dependent control of THz emission. The polarization dependence of the observed nonlinear photocurrents in the CoFeB/PdTe2/PdTe heterostructure aligns with the photogalvanic effects (PGE) arising from the combination of spin photocurrent and shift current in PdTe2/PdTe. The polarization-controlled photocurrent modulation demonstrated in this work offers critical insights for the development of advanced, ultrafast, and tunable THz devices based on topological Dirac systems.
{"title":"Ultrafast Photogalvanic Effect in Ferromagnet/Dirac Semimetal Heterostructures Diagnosed by Terahertz Emission Spectroscopy","authors":"Yingyu Guo,Zhongqiang Chen,Miao Cai,Zuanming Jin,Xuefeng Wang,Chao Zhang,Alexei V. Balakin,Alexander P. Shkurinov,Yan Peng,Yiming Zhu,Songlin Zhuang","doi":"10.1021/acsphotonics.5c02407","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c02407","url":null,"abstract":"Topological materials featuring spin-momentum-locked surface states and high spin-to-charge conversion (SCC) efficiency represent ideal alternatives to the nonmagnetic layer in conventional ferromagnetic (FM)/nonmagnetic spintronic terahertz (THz) emitters. In this study, we utilized time-domain THz emission spectroscopy (TES) to investigate the free-space THz radiation characteristics of the type-II topological Dirac semimetal PdTe2/PdTe and CoFeB/PdTe2/PdTe heterostructures. The contributions of ultrafast demagnetization induced charge current (UDC) and nonlinear photocurrents were distinguished by modulating the external magnetic field and the polarization state of the excitation laser. Experimental analysis reveals that the UDC of CoFeB/PdTe2/PdTe acts as the primary mechanism for THz generation, whereas the nonlinear effects within the PdTe2/PdTe heterostructure enable the additional polarization-dependent control of THz emission. The polarization dependence of the observed nonlinear photocurrents in the CoFeB/PdTe2/PdTe heterostructure aligns with the photogalvanic effects (PGE) arising from the combination of spin photocurrent and shift current in PdTe2/PdTe. The polarization-controlled photocurrent modulation demonstrated in this work offers critical insights for the development of advanced, ultrafast, and tunable THz devices based on topological Dirac systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"24 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138844","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}
Pub Date : 2026-02-06DOI: 10.1021/acsphotonics.5c03062
Tecla Gabbrielli, Chenghong Zhang, Francesco Cappelli, Iacopo Galli, Andrea Ottomaniello, Jérôme Faist, Alessandro Tredicucci, Alessandro Pitanti, Paolo De Natale, Simone Borri, Paolo Vezio
This work describes a self-mixing-assisted optomechanical platform for transferring information between near- and mid-infrared radiation. In particular, the self-mixing signal of a mid-infrared quantum cascade laser is used to detect the oscillation of a membrane driven by light-induced forces exerted by a near-infrared excitation beam, which is amplitude-modulated at the membrane resonance frequency. This technique benefits from spectral broadness and, therefore, can link different spectral regions from both the excitation and the probe sides. This versatility can pave the way for future applications of this self-mixing-assisted optomechanical platform in free-space communication and advanced sensing systems.
{"title":"Bridging Mid- and Near-Infrared by Combining Optomechanics and Self-Mixing","authors":"Tecla Gabbrielli, Chenghong Zhang, Francesco Cappelli, Iacopo Galli, Andrea Ottomaniello, Jérôme Faist, Alessandro Tredicucci, Alessandro Pitanti, Paolo De Natale, Simone Borri, Paolo Vezio","doi":"10.1021/acsphotonics.5c03062","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c03062","url":null,"abstract":"This work describes a self-mixing-assisted optomechanical platform for transferring information between near- and mid-infrared radiation. In particular, the self-mixing signal of a mid-infrared quantum cascade laser is used to detect the oscillation of a membrane driven by light-induced forces exerted by a near-infrared excitation beam, which is amplitude-modulated at the membrane resonance frequency. This technique benefits from spectral broadness and, therefore, can link different spectral regions from both the excitation and the probe sides. This versatility can pave the way for future applications of this self-mixing-assisted optomechanical platform in free-space communication and advanced sensing systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"177 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122128","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}
Pub Date : 2026-02-06DOI: 10.1021/acsphotonics.5c02826
Aditya Jagadeesh Malla, Katerina Nikolaidou, Miguel Dosil, Mariona Dalmases, Stephy Vincent, Marta Martos Valverde, Gerasimos Konstantatos
Shortwave infrared light sources are indispensable for various applications, including advanced imaging, spectroscopy, and sensing, yet their widespread adoption is limited by the high cost of epitaxial semiconductors, such as InGaAs. Downconverters (DCs) offer a cost-effective alternative, and quantum dots (QDs) stand out due to their high photoluminescence quantum yield, size-tunable emission, and solution processability. However, QD-DCs suffer from performance degradation under high excitation power densities due to significant heat generation in the process of light absorption. Here we have developed high-power, stable, and spectrally tunable narrowband and broadband SWIR DCs (1000–1600 nm) based on Lead sulfide QDs. By mixing two different-sized QDs, we exploit Förster resonance energy transfer and photon reabsorption to realize a binary system with a high photoluminescence quantum yield of 35%. Embedding the QDs in a poly(methyl methacrylate) host mitigates local thermal stress on the QDs, enabling standalone DCs with a high emission power density (EmPD) of 110 mW/cm2 at 1380 nm. Further optimization with a spectrally selective distributed Bragg reflector for enhanced light extraction and a sapphire substrate for efficient heat dissipation, we achieved a record EmPD of 385 mW/cm2 at 1380 nm with optical power conversion efficiency of 10% and operational stability above 230 h at an EmPD of 190 mW/cm2. This demonstrates a scalable route to low-cost SWIR light sources, narrowing the performance gap between solution-processed DCs and conventional epitaxial semiconductors.
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