Pub Date : 2025-04-21DOI: 10.1021/acsphotonics.4c01776
Jyoti Sardana, Shital Devinder, Shatha Kaassamani, Wenqi Zhu, Amit Agrawal, Joby Joseph
All optical information processing and identification enables high speed, low power consumption, and efficient complex data processing. Optical edge enhancement can extract structural and morphological information about an object; however, existing systems require bulky and complex optical configurations. Development of a low-cost, lightweight, integrable, and high-performance imaging system is thus necessary for biomedical and industrial applications in the field and onsite. Here we propose and demonstrate a compact metasurface imaging system composed of cascaded metasurfaces that function as a metalens and q-plate for isotropic edge enhancement of amplitude objects, phase objects, and biological specimens. Furthermore, we utilize the polarization degree of freedom of light in addition to amplitude and phase to achieve anisotropic edge enhancement. By utilizing different polarization states of incident light, the impulse response of the metasurface imaging system is modified to achieve real-time isotropic and directional edge enhancement while maintaining a field of view. The proposed approach demonstrates a robust, ultracompact, lightweight, efficient, and integrable platform for reliable, stable, and cost-effective point of care devices, process control, and monitoring.
{"title":"Polarization Specific Edge Enhancement Enabled by Compact Dielectric Metasurface Imaging System","authors":"Jyoti Sardana, Shital Devinder, Shatha Kaassamani, Wenqi Zhu, Amit Agrawal, Joby Joseph","doi":"10.1021/acsphotonics.4c01776","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01776","url":null,"abstract":"All optical information processing and identification enables high speed, low power consumption, and efficient complex data processing. Optical edge enhancement can extract structural and morphological information about an object; however, existing systems require bulky and complex optical configurations. Development of a low-cost, lightweight, integrable, and high-performance imaging system is thus necessary for biomedical and industrial applications in the field and onsite. Here we propose and demonstrate a compact metasurface imaging system composed of cascaded metasurfaces that function as a metalens and q-plate for isotropic edge enhancement of amplitude objects, phase objects, and biological specimens. Furthermore, we utilize the polarization degree of freedom of light in addition to amplitude and phase to achieve anisotropic edge enhancement. By utilizing different polarization states of incident light, the impulse response of the metasurface imaging system is modified to achieve real-time isotropic and directional edge enhancement while maintaining a field of view. The proposed approach demonstrates a robust, ultracompact, lightweight, efficient, and integrable platform for reliable, stable, and cost-effective point of care devices, process control, and monitoring.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"219 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853667","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 : 2025-04-19DOI: 10.1021/acsphotonics.4c02098
Xiaoke Chen, Lin Ma, Zuyuan He, Guiyuan Cao, Han Lin, Baohua Jia
Diffractive devices are essential components in the reduction of the volume of optical systems. The graphene oxide (GO) lens, well-known for its nanoscale thickness, high numerical aperture, one-step laser fabrication, and low fabrication cost, offers a significant advantage in the field of integration with fibers and photonics chips. However, existing research indicates that the diffraction efficiency of GO lenses integrated with fibers and photonics chips is quite low (around 10%). The low diffraction efficiency causes several issues for applications based on GO lenses, including energy dispersion, low signal-to-noise ratio, and low image brightness. In this study, we present the design and fabrication of a femtosecond laser direct writing (FLDW) fiber GO lens with a thickness of 400 nm, which has a diffraction efficiency of 34.7% (more than three times that of former research). Furthermore, the fiber GO lens exhibits a high numerical aperture (NA) of 0.55, rendering it a promising option for a diverse range of applications in optical communications, medical optics, and imaging systems.
{"title":"High Diffraction Effeciency Fiber Facet Flat GO Lens with a Large Numerical Aperture","authors":"Xiaoke Chen, Lin Ma, Zuyuan He, Guiyuan Cao, Han Lin, Baohua Jia","doi":"10.1021/acsphotonics.4c02098","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02098","url":null,"abstract":"Diffractive devices are essential components in the reduction of the volume of optical systems. The graphene oxide (GO) lens, well-known for its nanoscale thickness, high numerical aperture, one-step laser fabrication, and low fabrication cost, offers a significant advantage in the field of integration with fibers and photonics chips. However, existing research indicates that the diffraction efficiency of GO lenses integrated with fibers and photonics chips is quite low (around 10%). The low diffraction efficiency causes several issues for applications based on GO lenses, including energy dispersion, low signal-to-noise ratio, and low image brightness. In this study, we present the design and fabrication of a femtosecond laser direct writing (FLDW) fiber GO lens with a thickness of 400 nm, which has a diffraction efficiency of 34.7% (more than three times that of former research). Furthermore, the fiber GO lens exhibits a high numerical aperture (NA) of 0.55, rendering it a promising option for a diverse range of applications in optical communications, medical optics, and imaging systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"65 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849876","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}
Chiral phenomena in photonics have been extensively explored in various optical platforms such as chiral nanoparticles and photonic crystal slabs due to their potential in diverse applications such as sensing and light manipulation. Recently, photonic bound states in the continuum (BICs), which inherently exhibit spin and chiral nature, have drawn substantial interest owing to their ultrahigh quality factor and exceptional light confinement. However, achieving spin–orbit-locking chiral BICs or quasi-BICs remains a challenge, limiting their broader application in advanced optical devices. Here, we propose an approach to simultaneously realize spin–orbit-locking chiral BICs and quasi-BICs in magneto-optical photonic crystal slabs. When the period tripling, in-plane symmetry breaking, and time-reversal symmetry breaking operations are applied on a general and widely used honeycomb lattice, the Brillouin zone folding enabled degenerate bulk modes are transformed into a pair of BICs and a pair of quasi-BICs. The chirality of each mode is thoroughly investigated by inspecting the phase profile of the out-of-plane electric field, the radiation profile of the in-plane magnetic field, and the multipolar decomposition of near fields, all of which confirm the spin–orbit-locking feature. Our work introduces a design framework for creating chiral BICs and quasi-BICs, offering significant potential for future developments in chiral photonics and advanced optical engineering.
{"title":"Brillouin Zone Folding Induced Spin–Orbit-Locking Chiral BIC and Quasi-BIC","authors":"Hao-Chang Mo, Wen-Jin Zhang, Ze-Yu Wu, Xiao-Dong Chen, Jianwen Dong","doi":"10.1021/acsphotonics.5c00377","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00377","url":null,"abstract":"Chiral phenomena in photonics have been extensively explored in various optical platforms such as chiral nanoparticles and photonic crystal slabs due to their potential in diverse applications such as sensing and light manipulation. Recently, photonic bound states in the continuum (BICs), which inherently exhibit spin and chiral nature, have drawn substantial interest owing to their ultrahigh quality factor and exceptional light confinement. However, achieving spin–orbit-locking chiral BICs or quasi-BICs remains a challenge, limiting their broader application in advanced optical devices. Here, we propose an approach to simultaneously realize spin–orbit-locking chiral BICs and quasi-BICs in magneto-optical photonic crystal slabs. When the period tripling, in-plane symmetry breaking, and time-reversal symmetry breaking operations are applied on a general and widely used honeycomb lattice, the Brillouin zone folding enabled degenerate bulk modes are transformed into a pair of BICs and a pair of quasi-BICs. The chirality of each mode is thoroughly investigated by inspecting the phase profile of the out-of-plane electric field, the radiation profile of the in-plane magnetic field, and the multipolar decomposition of near fields, all of which confirm the spin–orbit-locking feature. Our work introduces a design framework for creating chiral BICs and quasi-BICs, offering significant potential for future developments in chiral photonics and advanced optical engineering.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"263 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841668","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 : 2025-04-17DOI: 10.1021/acsphotonics.4c02065
Martin Gomez-Dominguez, Victoria Quirós-Cordero, Esteban Rojas-Gatjens, Katherine A. Koch, Evan J. Kumar, Carlo A. R. Perini, Natalie Stingelin, Carlos Silva-Acuña, Ajay Ram Srimath Kandada, Vinod Menon, Juan-Pablo Correa-Baena
Two-dimensional metal halide phases, commonly known as 2D perovskites, have emerged as promising materials for exciton-polaritons, particularly for polariton condensation. This process entails the spontaneous accumulation of population in the polariton ground state and relies on efficient energy relaxation. In this class of materials, this relaxation is mediated by exciton reservoir emission, which pumps polariton states through radiative pumping. To achieve strong light–matter coupling and sustain a high polariton density, the material must possess excitations with large oscillator strength and high exciton binding energy. While 2D perovskites exhibit these desirable characteristics, there are no reports of room-temperature polariton condensation and only one successful demonstration at cryogenic temperatures. In this work, we systematically explore the role of energy alignment between the exciton reservoir emission and the lower polariton branch in populating the polariton ground state via radiative pumping. Through cavity detuning, we shift the lower polariton energy minimum to overlap with the emission of the exciton reservoir at different energies. We identify that the multiple radiative pathways of 2D perovskites lead to inefficient radiative pumping of the lower polariton branch at the lowest-energy state, ultimately posing challenges for polariton condensation in this class of materials.
{"title":"Multiple Emission Peaks Challenge Polariton Condensation in Phenethylammonium-Based 2D Perovskite Microcavities","authors":"Martin Gomez-Dominguez, Victoria Quirós-Cordero, Esteban Rojas-Gatjens, Katherine A. Koch, Evan J. Kumar, Carlo A. R. Perini, Natalie Stingelin, Carlos Silva-Acuña, Ajay Ram Srimath Kandada, Vinod Menon, Juan-Pablo Correa-Baena","doi":"10.1021/acsphotonics.4c02065","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02065","url":null,"abstract":"Two-dimensional metal halide phases, commonly known as 2D perovskites, have emerged as promising materials for exciton-polaritons, particularly for polariton condensation. This process entails the spontaneous accumulation of population in the polariton ground state and relies on efficient energy relaxation. In this class of materials, this relaxation is mediated by exciton reservoir emission, which pumps polariton states through radiative pumping. To achieve strong light–matter coupling and sustain a high polariton density, the material must possess excitations with large oscillator strength and high exciton binding energy. While 2D perovskites exhibit these desirable characteristics, there are no reports of room-temperature polariton condensation and only one successful demonstration at cryogenic temperatures. In this work, we systematically explore the role of energy alignment between the exciton reservoir emission and the lower polariton branch in populating the polariton ground state via radiative pumping. Through cavity detuning, we shift the lower polariton energy minimum to overlap with the emission of the exciton reservoir at different energies. We identify that the multiple radiative pathways of 2D perovskites lead to inefficient radiative pumping of the lower polariton branch at the lowest-energy state, ultimately posing challenges for polariton condensation in this class of materials.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"35 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841667","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 : 2025-04-16DOI: 10.1021/acsphotonics.5c0044910.1021/acsphotonics.5c00449
Romain Quidant,
{"title":"Recognizing Excellence in Photonics: Finalists of the ACS Photonics Young Investigator Award","authors":"Romain Quidant, ","doi":"10.1021/acsphotonics.5c0044910.1021/acsphotonics.5c00449","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00449https://doi.org/10.1021/acsphotonics.5c00449","url":null,"abstract":"","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 4","pages":"1716–1717 1716–1717"},"PeriodicalIF":6.5,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833009","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 : 2025-04-16DOI: 10.1021/acsphotonics.5c00312
Jiankai Xia, Yi He, Zhipeng Zhang, Jinhong Yan, Ruirong Wang, Mingxuan Tang, Jingye Chen, Jun Fan, Kun Chen
Single-molecule displacement/diffusivity mapping (SMdM) has revolutionized the study of molecular motion in live cells by providing high spatial resolution insights. However, its utility is restricted by measurement biases and low throughput, making it challenging to capture temporal dynamics of intracellular diffusivity. Here we report a high-throughput single-molecule diffusivity microscopy approach (Hi-SMdM) that rapidly and unbiasedly maps nanoscale heterogeneities in molecular motion inside mammalian cells, enabling time-resolved imaging of local diffusivity dynamics. Hi-SMdM employs a self-supervised deep-learning denoising framework with a general noise model to effectively restore the scarce signals of fast-moving single molecules, while eliminating artifact motions without relying on spatial redundancies or temporal correlations. It then provides unbiased estimations of the nanoscale diffusion coefficient and improves both throughput and temporal resolution by up to an order of magnitude. We demonstrate the versatility of Hi-SMdM through time-resolved mapping of the spatially heterogeneous diffusivity of free proteins in the cytoplasm. Hi-SMdM also unveils the temporal dynamics of intracellular diffusion under hypotonic conditions in live cells. Additionally, Hi-SMdM tracks the spatiotemporal dynamics of intraorganellar diffusivity during rapid rearrangements of the ER network and functional activities of mitochondria. Overall, Hi-SMdM provides exceptional opportunities for high-throughput and unbiased single-molecule diffusivity mapping with excellent spatiotemporal resolution.
{"title":"High-Throughput, Unbiased Single-Molecule Displacement Mapping with Deep Learning Reveals Spatiotemporal Heterogeneities in Intracellular Diffusivity","authors":"Jiankai Xia, Yi He, Zhipeng Zhang, Jinhong Yan, Ruirong Wang, Mingxuan Tang, Jingye Chen, Jun Fan, Kun Chen","doi":"10.1021/acsphotonics.5c00312","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00312","url":null,"abstract":"Single-molecule displacement/diffusivity mapping (SM<i>d</i>M) has revolutionized the study of molecular motion in live cells by providing high spatial resolution insights. However, its utility is restricted by measurement biases and low throughput, making it challenging to capture temporal dynamics of intracellular diffusivity. Here we report a high-throughput single-molecule diffusivity microscopy approach (Hi-SM<i>d</i>M) that rapidly and unbiasedly maps nanoscale heterogeneities in molecular motion inside mammalian cells, enabling time-resolved imaging of local diffusivity dynamics. Hi-SM<i>d</i>M employs a self-supervised deep-learning denoising framework with a general noise model to effectively restore the scarce signals of fast-moving single molecules, while eliminating artifact motions without relying on spatial redundancies or temporal correlations. It then provides unbiased estimations of the nanoscale diffusion coefficient and improves both throughput and temporal resolution by up to an order of magnitude. We demonstrate the versatility of Hi-SM<i>d</i>M through time-resolved mapping of the spatially heterogeneous diffusivity of free proteins in the cytoplasm. Hi-SM<i>d</i>M also unveils the temporal dynamics of intracellular diffusion under hypotonic conditions in live cells. Additionally, Hi-SM<i>d</i>M tracks the spatiotemporal dynamics of intraorganellar diffusivity during rapid rearrangements of the ER network and functional activities of mitochondria. Overall, Hi-SM<i>d</i>M provides exceptional opportunities for high-throughput and unbiased single-molecule diffusivity mapping with excellent spatiotemporal resolution.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"6 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841671","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}
Photonic spin-Hall effects (PSHEs), originating from the interaction between spin and orbital angular momenta, have been widely investigated for amplitude and phase spatial differential imaging. However, PSHE-based optical spatial differential imaging methods impose strict requirements on the polarization of the input field, limiting their application in scenarios where the polarization state of the light cannot be easily controlled or the input field is inherently a polarization field. Here, we propose an optical differentiator utilizing cascaded PSHEs to achieve full-dimensional optical spatial differential imaging. By creating giant and tiny PSHEs using liquid-crystal half-wave and quarter-wave polarization gratings, the input field is separated into two circular polarization basis vectors for independent differentiation operations. We demonstrate that this differentiator enables differential imaging of amplitude, phase, and polarization fields. Furthermore, we achieve controllable contrast in the differential images of the two circular polarization basis vectors by longitudinally or transversely moving the half-wave or quarter-wave polarization grating. Our findings might open up new possibilities for applications in areas such as advanced imaging techniques, material characterization, and optical information processing.
{"title":"Full-Dimensional Photonic Spin-Hall Spatial Differential Imaging","authors":"Yanliang He, Feiguo Fang, Cuicui Li, Wen Yuan, Haimei Luo, Xianping Wang","doi":"10.1021/acsphotonics.5c00567","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00567","url":null,"abstract":"Photonic spin-Hall effects (PSHEs), originating from the interaction between spin and orbital angular momenta, have been widely investigated for amplitude and phase spatial differential imaging. However, PSHE-based optical spatial differential imaging methods impose strict requirements on the polarization of the input field, limiting their application in scenarios where the polarization state of the light cannot be easily controlled or the input field is inherently a polarization field. Here, we propose an optical differentiator utilizing cascaded PSHEs to achieve full-dimensional optical spatial differential imaging. By creating giant and tiny PSHEs using liquid-crystal half-wave and quarter-wave polarization gratings, the input field is separated into two circular polarization basis vectors for independent differentiation operations. We demonstrate that this differentiator enables differential imaging of amplitude, phase, and polarization fields. Furthermore, we achieve controllable contrast in the differential images of the two circular polarization basis vectors by longitudinally or transversely moving the half-wave or quarter-wave polarization grating. Our findings might open up new possibilities for applications in areas such as advanced imaging techniques, material characterization, and optical information processing.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"30 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841672","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}
High-performance blue quantum dot light-emitting diodes (QLEDs) have great potential application in full-color display. However, realization of eco-friendly pure-blue QLEDs is limited by the shallow highest occupied molecular orbital (HOMO) level and low conductivity of hole transport layers (HTLs). Here, a facile strategy of doping the HTL with a multifunctional molecule, i.e., silver bis(trifluoromethylsulfonyl)imide (Ag-TFSI), is demonstrated. This p-doping strategy simultaneously improves the energy level alignment at the HTL/QD interface and enhances the conductivity of the HTL, as well as prevents quantum dots (QDs) from getting charged. Benefiting from the better charge balance and mitigated nonradiative recombination of excitons, the blue zinc tellurium selenium (ZnTeSe)-based QLEDs exhibit a peak external quantum efficiency (EQE) of 13.9% with an electroluminance emission located at 456 nm. Moreover, the device lifetime is enhanced by more than twofold. This work suggests a promising p-doping strategy to accelerate the development of eco-friendly QLEDs toward display applications.
{"title":"High-Efficiency Cadmium-Free Blue Quantum Dot Light-Emitting Diodes Enabled by Engineering of a Hole Transporting Interface with a Multifunctional Molecule","authors":"Lixi Wang, Haitao Liu, Fan Fang, Jiangyong Pan, Zhenghao Gao, Xingyu Liu, Yuyang Wei, Yujie Qin, Xiuwei Huo, Jia Lu, Chengjun Liu, Lei Mao, Jianhua Chang, Jing Chen, Yuning Zhang, Baoping Wang, Dewei Zhao","doi":"10.1021/acsphotonics.4c02140","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02140","url":null,"abstract":"High-performance blue quantum dot light-emitting diodes (QLEDs) have great potential application in full-color display. However, realization of eco-friendly pure-blue QLEDs is limited by the shallow highest occupied molecular orbital (HOMO) level and low conductivity of hole transport layers (HTLs). Here, a facile strategy of doping the HTL with a multifunctional molecule, i.e., silver bis(trifluoromethylsulfonyl)imide (Ag-TFSI), is demonstrated. This p-doping strategy simultaneously improves the energy level alignment at the HTL/QD interface and enhances the conductivity of the HTL, as well as prevents quantum dots (QDs) from getting charged. Benefiting from the better charge balance and mitigated nonradiative recombination of excitons, the blue zinc tellurium selenium (ZnTeSe)-based QLEDs exhibit a peak external quantum efficiency (EQE) of 13.9% with an electroluminance emission located at 456 nm. Moreover, the device lifetime is enhanced by more than twofold. This work suggests a promising p-doping strategy to accelerate the development of eco-friendly QLEDs toward display applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"3 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837532","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 : 2025-04-16DOI: 10.1021/acsphotonics.5c0038410.1021/acsphotonics.5c00384
Ieng-Wai Un, Naama Harcavi and Yonatan Sivan*,
Transparent conducting oxides (TCOs) have recently been shown to have a remarkably strong nonlinear optical response. We show that the popular ascription of their nonlinearity to the temperature-dependence of the plasma frequency is only a partial description of their response to intense illumination. Specifically, we show that an increase in the electron collision rate upon illumination and consequent heating contributes to the permittivity in a manner that can be quantitatively comparable to the contribution of the temperature-dependent plasma frequency. This behavior makes the optical nonlinearity of TCOs more similar to that of noble metals than realized so far, and as far as the imaginary part of the permittivity is concerned, this behavior is qualitatively opposite compared to that assumed so far.
{"title":"Optical Nonlinearity of Transparent Conducting Oxides: More Metallic than Realized","authors":"Ieng-Wai Un, Naama Harcavi and Yonatan Sivan*, ","doi":"10.1021/acsphotonics.5c0038410.1021/acsphotonics.5c00384","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00384https://doi.org/10.1021/acsphotonics.5c00384","url":null,"abstract":"<p >Transparent conducting oxides (TCOs) have recently been shown to have a remarkably strong nonlinear optical response. We show that the popular ascription of their nonlinearity to the temperature-dependence of the plasma frequency is only a partial description of their response to intense illumination. Specifically, we show that an increase in the electron collision rate upon illumination and consequent heating contributes to the permittivity in a manner that can be quantitatively comparable to the contribution of the temperature-dependent plasma frequency. This behavior makes the optical nonlinearity of TCOs more similar to that of noble metals than realized so far, and as far as the imaginary part of the permittivity is concerned, this behavior is qualitatively opposite compared to that assumed so far.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 4","pages":"1718–1721 1718–1721"},"PeriodicalIF":6.5,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.5c00384","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-16DOI: 10.1021/acsphotonics.5c00127
Min Wang, Chengnian Liu, Xin Zhou, Jincheng Li, Ze Wang, Da-Quan Yang, Qi-Fan Yang, Bei-Bei Li
Stimulated Brillouin scattering (SBS) in microresonators provides a simple way to achieve chip-scale narrow-linewidth lasers. While theoretical studies suggest that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser, this phenomenon has yet to be experimentally validated. In this work, we investigate the fundamental linewidth behaviors of the Brillouin lasers in both the non-cascaded and cascaded cases using an ultrahigh-Q factor microrod resonator. In the non-cascaded case, we achieve a Brillouin laser with a 188 mHz fundamental linewidth without using an erbium-doped fiber amplifier. In the cascaded case, we observe, for the first time, that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser. These findings highlight the importance of mitigating or avoiding the cascading effect to achieve the narrowest possible linewidths of Brillouin lasers.
{"title":"Cascading-Induced Fundamental Linewidth Enhancement of a Microcavity Brillouin Laser","authors":"Min Wang, Chengnian Liu, Xin Zhou, Jincheng Li, Ze Wang, Da-Quan Yang, Qi-Fan Yang, Bei-Bei Li","doi":"10.1021/acsphotonics.5c00127","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00127","url":null,"abstract":"Stimulated Brillouin scattering (SBS) in microresonators provides a simple way to achieve chip-scale narrow-linewidth lasers. While theoretical studies suggest that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser, this phenomenon has yet to be experimentally validated. In this work, we investigate the fundamental linewidth behaviors of the Brillouin lasers in both the non-cascaded and cascaded cases using an ultrahigh-<i>Q</i> factor microrod resonator. In the non-cascaded case, we achieve a Brillouin laser with a 188 mHz fundamental linewidth without using an erbium-doped fiber amplifier. In the cascaded case, we observe, for the first time, that the cascading effect enhances the fundamental linewidth of the first-order Brillouin laser. These findings highlight the importance of mitigating or avoiding the cascading effect to achieve the narrowest possible linewidths of Brillouin lasers.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"59 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841670","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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