{"title":"Continuously Modulated Helical Dichroism of Tunable Chiral System by Magnetic Field Control","authors":"Zeheng Wu, Hao Wu, Yusheng Jin, Yuan Tao, Zhongguo Ren, Jincheng Ni*, Yanlei Hu, Dong Wu, Jiaru Chu and Jiawen Li*, ","doi":"10.1021/acsphotonics.5c0038910.1021/acsphotonics.5c00389","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00389https://doi.org/10.1021/acsphotonics.5c00389","url":null,"abstract":"<p >Dynamically tunable circular dichroism (CD) shows significant potential in biosensing, information storage and encryption, and optical displays. However, as another dimension of chiroptical responses, continuously tunable orbital angular momentum (OAM)-dependent helical dichroism (HD) spectra remain challenging. Here, we introduce a magnetically actuated tunable chiral system, which can realize geometric reconfiguration and the modulation of corresponding HD spectra under the control of a magnetic field. The geometric reconfiguration demonstrates fast responsiveness (∼2.01 s), stability, and robustness under magnetic actuation. The tunability and continuity of geometric chirality are demonstrated through Osipov–Pickup–Dunmur (OPD)-based simulations. Moreover, precise modulation of the OPD magnitude and peak position can be realized by adjusting various structural parameters. Continuous control of the OAM-associated HD spectra can be achieved with tunability ranging from −75% to 74%. This modulation of HD, attributed to the influence of the magnetic field, showcases the potential of this magnetically actuated flexible chiral system as a versatile platform for manipulating OAM beams, paving the way for chiral optical systems and dynamic beam shaping applications.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 5","pages":"2802–2809 2802–2809"},"PeriodicalIF":6.5,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098012","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}
ACS PhotonicsPub Date : 2025-05-06DOI: 10.1021/acsphotonics.5c00152
Yingming Wang, Lingyan Xu, Lu Liang, Zhentao Qin, Shuai Han, Chongqi Liu, Lixiang Lian, Wei Zheng, Yanyan Lei, Qinzeng Hu, Tao Wang, Wanqi Jie
{"title":"High-Performance MDABCO-NH4(BF4)3 Single Crystals for Rapid Real-Time Charged Particle Detection and Tissue-Equivalent X-ray Imaging","authors":"Yingming Wang, Lingyan Xu, Lu Liang, Zhentao Qin, Shuai Han, Chongqi Liu, Lixiang Lian, Wei Zheng, Yanyan Lei, Qinzeng Hu, Tao Wang, Wanqi Jie","doi":"10.1021/acsphotonics.5c00152","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00152","url":null,"abstract":"Achieving real-time, high-sensitivity radiation detection with stability and precision remains a critical challenge in medical diagnostics and radiation therapy. Here, we report the development of MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> single crystals (SCs), a metal-free perovskite material with exceptional performance for both X-ray and charged particle detection. Large-scale MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> SCs (15 × 13 × 5 mm<sup>3</sup>) were synthesized via a simple low-temperature solution method, achieving superior crystallinity with a full width at half-maximum (fwhm) of 0.0061°. The MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors exhibit high resistivity (1.31 × 10<sup>12</sup> Ω·cm), low trap density (1.09 × 10<sup>9</sup> cm<sup>–3</sup>), and excellent charge transport properties ((μτ)<sub>h</sub> = 3.15 × 10<sup>–5</sup> cm<sup>2</sup>·V<sup>–1</sup>). For α-particle detection, the MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors achieve a high energy resolution of 35.0% at 5.49 MeV and a fast response time of 5 ms, demonstrating single-particle sensitivity. For X-ray detection, MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors exhibit high sensitivity (13,529 μC·Gy<sub>abs</sub><sup>–1</sup>·cm<sup>–2</sup>) and an ultralow detection limit (17.1 nGy<sub>air</sub>·s<sup>–1</sup>), significantly lower than the 5.5 μGy<sub>air</sub>·s<sup>–1</sup> standard for active personal dosimeters used in regular medical diagnostics. The combination of superior charge transport properties with stability and high signal-to-noise ratio establishes MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> SCs as a versatile material for real-time radiation monitoring and high-precision medical imaging applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"16 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915471","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}
ACS PhotonicsPub Date : 2025-05-06DOI: 10.1021/acsphotonics.5c0015210.1021/acsphotonics.5c00152
Yingming Wang, Lingyan Xu*, Lu Liang, Zhentao Qin, Shuai Han, Chongqi Liu, Lixiang Lian, Wei Zheng, Yanyan Lei, Qinzeng Hu, Tao Wang and Wanqi Jie,
{"title":"High-Performance MDABCO-NH4(BF4)3 Single Crystals for Rapid Real-Time Charged Particle Detection and Tissue-Equivalent X-ray Imaging","authors":"Yingming Wang, Lingyan Xu*, Lu Liang, Zhentao Qin, Shuai Han, Chongqi Liu, Lixiang Lian, Wei Zheng, Yanyan Lei, Qinzeng Hu, Tao Wang and Wanqi Jie, ","doi":"10.1021/acsphotonics.5c0015210.1021/acsphotonics.5c00152","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00152https://doi.org/10.1021/acsphotonics.5c00152","url":null,"abstract":"<p >Achieving real-time, high-sensitivity radiation detection with stability and precision remains a critical challenge in medical diagnostics and radiation therapy. Here, we report the development of MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> single crystals (SCs), a metal-free perovskite material with exceptional performance for both X-ray and charged particle detection. Large-scale MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> SCs (15 × 13 × 5 mm<sup>3</sup>) were synthesized via a simple low-temperature solution method, achieving superior crystallinity with a full width at half-maximum (fwhm) of 0.0061°. The MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors exhibit high resistivity (1.31 × 10<sup>12</sup> Ω·cm), low trap density (1.09 × 10<sup>9</sup> cm<sup>–3</sup>), and excellent charge transport properties ((μτ)<sub>h</sub> = 3.15 × 10<sup>–5</sup> cm<sup>2</sup>·V<sup>–1</sup>). For α-particle detection, the MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors achieve a high energy resolution of 35.0% at 5.49 MeV and a fast response time of 5 ms, demonstrating single-particle sensitivity. For X-ray detection, MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> detectors exhibit high sensitivity (13,529 μC·Gy<sub>abs</sub><sup>–1</sup>·cm<sup>–2</sup>) and an ultralow detection limit (17.1 nGy<sub>air</sub>·s<sup>–1</sup>), significantly lower than the 5.5 μGy<sub>air</sub>·s<sup>–1</sup> standard for active personal dosimeters used in regular medical diagnostics. The combination of superior charge transport properties with stability and high signal-to-noise ratio establishes MDABCO-NH<sub>4</sub>(BF<sub>4</sub>)<sub>3</sub> SCs as a versatile material for real-time radiation monitoring and high-precision medical imaging applications.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 5","pages":"2685–2694 2685–2694"},"PeriodicalIF":6.5,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098180","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.4c0123010.1021/acsphotonics.4c01230
T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona* and Riccardo Sapienza*,
{"title":"Single-Mode Emission by Phase-Delayed Coupling Between Nanolasers","authors":"T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona* and Riccardo Sapienza*, ","doi":"10.1021/acsphotonics.4c0123010.1021/acsphotonics.4c01230","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01230https://doi.org/10.1021/acsphotonics.4c01230","url":null,"abstract":"<p >Near-field coupling between nanolasers enables collective high-power lasing but leads to complex spectral reshaping and multimode operation, limiting the emission brightness, spatial coherence, and temporal stability. Many lasing architectures have been proposed to circumvent this limitation based on symmetries, topology, or interference. We show that a much simpler and robust method exploiting phase-delayed coupling, where light exchanged by the lasers carries a phase, can enable stable single-mode operation. Phase-delayed coupling changes the modal amplification: for pump powers close to the anyonic parity-time (PT) symmetric exceptional point, a high phase delay completely separates the mode thresholds, leading to single-mode operation. This is shown by stability analysis with nonlinear coupled mode theory and stochastic differential equations for two coupled nanolasers and confirmed by a realistic semianalytical treatment of a dimer of lasing nanospheres. Finally, we extend the mode control to large arrays of nanolasers featuring lowered thresholds and higher power. Our work promises a novel solution to engineer bright and stable single-mode lasing from nanolaser arrays with important applications in photonic chips for communication and LIDAR.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 5","pages":"2337–2343 2337–2343"},"PeriodicalIF":6.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01230","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097945","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.4c01230
T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona, Riccardo Sapienza
{"title":"Single-Mode Emission by Phase-Delayed Coupling Between Nanolasers","authors":"T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona, Riccardo Sapienza","doi":"10.1021/acsphotonics.4c01230","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01230","url":null,"abstract":"Near-field coupling between nanolasers enables collective high-power lasing but leads to complex spectral reshaping and multimode operation, limiting the emission brightness, spatial coherence, and temporal stability. Many lasing architectures have been proposed to circumvent this limitation based on symmetries, topology, or interference. We show that a much simpler and robust method exploiting phase-delayed coupling, where light exchanged by the lasers carries a phase, can enable stable single-mode operation. Phase-delayed coupling changes the modal amplification: for pump powers close to the anyonic parity-time (PT) symmetric exceptional point, a high phase delay completely separates the mode thresholds, leading to single-mode operation. This is shown by stability analysis with nonlinear coupled mode theory and stochastic differential equations for two coupled nanolasers and confirmed by a realistic semianalytical treatment of a dimer of lasing nanospheres. Finally, we extend the mode control to large arrays of nanolasers featuring lowered thresholds and higher power. Our work promises a novel solution to engineer bright and stable single-mode lasing from nanolaser arrays with important applications in photonic chips for communication and LIDAR.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"19 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905561","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.5c00098
Linpei Xue, Steve J. Elston, Stephen M. Morris
{"title":"Polarization-Independent Nematic Liquid Crystal Phase Modulators","authors":"Linpei Xue, Steve J. Elston, Stephen M. Morris","doi":"10.1021/acsphotonics.5c00098","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00098","url":null,"abstract":"In this paper, we investigate the potential of achieving polarization independent phase modulation using supertwisted nematic (STN) liquid crystal (LC) devices. Here, we describe the use of a burst driving voltage applied to a 180° STN LC device to obtain a twist symmetric H (T-Hs) state, which enables simultaneous modulation of light for all polarizations, demonstrating a polarization independent characteristic in the time domain. Additionally, we consider a 90° twisted nematic (TN) LC device for comparison, as this can also exhibit polarization independent characteristics. Simulations were carried out using a numerical model based on the Ericksen–Leslie continuum equations, which was employed in conjunction with the Jones calculus to simulate the optical properties of the device. The time-dependent optical phase modulation of the device was subsequently measured by using a phase-shifting Mach–Zehnder interferometer. The experimental results demonstrate that an STN device with an 8.9 μm thick LC layer operating in the T-Hs state exhibited a π/2 optical phase modulation in 1 ms for a burst voltage of 30 Vrms that was found to be independent of the incident polarization. These measurements were obtained at room temperature in a single optical path configuration and were found to be in good agreement with the results from the simulations.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"8 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910605","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.4c01989
Anastasia Romashkina, Sandhya Sushil, Angela I. Barreda, Zlata Fedorova, Fatemeh Abtahi, Nathan Doolaard, Zifei Zhang, Christian Helgert, Isabelle Staude, Falk Eilenberger, Thomas Pertsch, Bayarjargal N. Tugchin
{"title":"Enhanced Exciton–Plasmon Interaction Enabling Observation of Near-Field Photoluminescence in a WSe2–Gold Nanoparticle Hybrid System","authors":"Anastasia Romashkina, Sandhya Sushil, Angela I. Barreda, Zlata Fedorova, Fatemeh Abtahi, Nathan Doolaard, Zifei Zhang, Christian Helgert, Isabelle Staude, Falk Eilenberger, Thomas Pertsch, Bayarjargal N. Tugchin","doi":"10.1021/acsphotonics.4c01989","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01989","url":null,"abstract":"Monolayer transition metal dichalcogenides, such as tungsten diselenide, have recently attracted considerable attention due to their reduced dielectric screening and direct bandgap, which result in high exciton binding energy and strong photoluminescence. The integration of monolayer transition metal dichalcogenides with plasmonic nanoparticles enhances their optoelectronic properties through localized surface plasmons and strong electromagnetic confinement. We investigated the photoluminescence response of the hybrid system of monolayer tungsten diselenide and gold nanoparticle arrays through near-field mapping. Our study demonstrated a significant enhancement of the excitonic emission by the excited gold nanoparticles via near-field interaction. We examined the impact of exciton–plasmon-polariton coupling on the far-field response of the hybrid system. There, we observed the phenomenon of exciton-induced transparency, which indicates the intermediate coupling regime and helps resonantly enhance the light-matter interaction in monolayer tungsten diselenide. The second harmonic generation intensity from the hybrid system was shown to follow the linear spectral response of the hybrid system, thereby demonstrating the enhanced coupling between surface plasmons and excitons. Our research offers insights into the impact of intermediate coupling on the optical properties of hybrid exciton–plasmon systems, which is crucial for the development of advanced nanophotonic devices.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"137 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910604","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.4c01306
Aliki Souzou, Modestos Athanasiou, Andreas Manoli, Marios Constantinou, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Chrysafis Andreou, Grigorios Itskos
{"title":"Interactions of Light, Surface Plasmons and Excitons in Bilayers of FAPbI3 Nanocrystals with Core–Shell Au/SiO2 Nanoparticles","authors":"Aliki Souzou, Modestos Athanasiou, Andreas Manoli, Marios Constantinou, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Chrysafis Andreou, Grigorios Itskos","doi":"10.1021/acsphotonics.4c01306","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01306","url":null,"abstract":"Integration of plasmonic nanostructures into perovskites is an effective way to enhance and tailor light–matter interactions, resulting in further improvement of the already impressive intrinsic photonic properties of the perovskites. Despite remarkable recent progress, the complex mechanisms via which light, excitons and plasmons interact in such hybrid structures are not fully understood. Herein, plasmonic-perovskite structures in bilayer configuration are produced by the deposition of formamidinium lead triiodide (FAPbI<sub>3</sub>) nanocrystals (NCs) on top of a core–shell gold-silica (Au/SiO<sub>2</sub>) nanoparticle (NP) underlayer. By tuning the NP core and shell size, a 5-fold enhancement of the macroscopic absorption and luminescence in the vicinity of the localized surface plasmon (LSP) resonance can be achieved in the bilayers compared to reference, pristine FAPbI<sub>3</sub> NCs films. Optical spectroscopy performed both at the ensemble and at the few particle level, supported by numerical simulations allow to disentangle the contributions of near-field LSP-exciton and far-field LSP-light interactions that result in the enhancement of the light absorption and light emission. Based on our results, far field light scattering by the LSP results in photon recycling within the perovskite NCs layer, effectively increasing light absorption and light emission. Near-field energy transfer from the metal NPs to the semiconductor NCs contributes less but becomes significant for the case of large core and small shell NPs due to the increased spectral overlap and closer proximity of the surface plasmons and excitons, respectively.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"39 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910621","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.4c0130610.1021/acsphotonics.4c01306
Aliki Souzou, Modestos Athanasiou, Andreas Manoli, Marios Constantinou, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Chrysafis Andreou and Grigorios Itskos*,
{"title":"Interactions of Light, Surface Plasmons and Excitons in Bilayers of FAPbI3 Nanocrystals with Core–Shell Au/SiO2 Nanoparticles","authors":"Aliki Souzou, Modestos Athanasiou, Andreas Manoli, Marios Constantinou, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Chrysafis Andreou and Grigorios Itskos*, ","doi":"10.1021/acsphotonics.4c0130610.1021/acsphotonics.4c01306","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01306https://doi.org/10.1021/acsphotonics.4c01306","url":null,"abstract":"<p >Integration of plasmonic nanostructures into perovskites is an effective way to enhance and tailor light–matter interactions, resulting in further improvement of the already impressive intrinsic photonic properties of the perovskites. Despite remarkable recent progress, the complex mechanisms via which light, excitons and plasmons interact in such hybrid structures are not fully understood. Herein, plasmonic-perovskite structures in bilayer configuration are produced by the deposition of formamidinium lead triiodide (FAPbI<sub>3</sub>) nanocrystals (NCs) on top of a core–shell gold-silica (Au/SiO<sub>2</sub>) nanoparticle (NP) underlayer. By tuning the NP core and shell size, a 5-fold enhancement of the macroscopic absorption and luminescence in the vicinity of the localized surface plasmon (LSP) resonance can be achieved in the bilayers compared to reference, pristine FAPbI<sub>3</sub> NCs films. Optical spectroscopy performed both at the ensemble and at the few particle level, supported by numerical simulations allow to disentangle the contributions of near-field LSP-exciton and far-field LSP-light interactions that result in the enhancement of the light absorption and light emission. Based on our results, far field light scattering by the LSP results in photon recycling within the perovskite NCs layer, effectively increasing light absorption and light emission. Near-field energy transfer from the metal NPs to the semiconductor NCs contributes less but becomes significant for the case of large core and small shell NPs due to the increased spectral overlap and closer proximity of the surface plasmons and excitons, respectively.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 5","pages":"2344–2355 2344–2355"},"PeriodicalIF":6.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01306","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097943","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}
ACS PhotonicsPub Date : 2025-05-05DOI: 10.1021/acsphotonics.5c0009810.1021/acsphotonics.5c00098
Linpei Xue, Steve J. Elston and Stephen M. Morris*,
{"title":"Polarization-Independent Nematic Liquid Crystal Phase Modulators","authors":"Linpei Xue, Steve J. Elston and Stephen M. Morris*, ","doi":"10.1021/acsphotonics.5c0009810.1021/acsphotonics.5c00098","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00098https://doi.org/10.1021/acsphotonics.5c00098","url":null,"abstract":"<p >In this paper, we investigate the potential of achieving polarization independent phase modulation using supertwisted nematic (STN) liquid crystal (LC) devices. Here, we describe the use of a burst driving voltage applied to a 180° STN LC device to obtain a twist symmetric H (T-Hs) state, which enables simultaneous modulation of light for all polarizations, demonstrating a polarization independent characteristic in the time domain. Additionally, we consider a 90° twisted nematic (TN) LC device for comparison, as this can also exhibit polarization independent characteristics. Simulations were carried out using a numerical model based on the Ericksen–Leslie continuum equations, which was employed in conjunction with the Jones calculus to simulate the optical properties of the device. The time-dependent optical phase modulation of the device was subsequently measured by using a phase-shifting Mach–Zehnder interferometer. The experimental results demonstrate that an STN device with an 8.9 μm thick LC layer operating in the T-Hs state exhibited a π/2 optical phase modulation in 1 ms for a burst voltage of 30 Vrms that was found to be independent of the incident polarization. These measurements were obtained at room temperature in a single optical path configuration and were found to be in good agreement with the results from the simulations.</p>","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 5","pages":"2612–2623 2612–2623"},"PeriodicalIF":6.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.5c00098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097944","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}