ACS Photonics最新文献_第4页

Nanophotonic-Enhanced Thermal Circular Dichroism for Chiral Sensing

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-11 DOI: 10.1021/acsphotonics.4c01339

Ershad Mohammadi, Giulia Tagliabue

{"title":"Nanophotonic-Enhanced Thermal Circular Dichroism for Chiral Sensing","authors":"Ershad Mohammadi, Giulia Tagliabue","doi":"10.1021/acsphotonics.4c01339","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01339","url":null,"abstract":"Circular dichroism (CD) can distinguish the handedness of the chiral molecules. However, it is typically very weak due to vanishing absorption at low molecular concentrations. Here, we suggest thermal CD (TCD) for chiral detection, leveraging the temperature difference in the chiral sample when subjected to right- and left-circularly polarized excitations. The TCD combines the enantiospecificity of CD with the higher sensitivity of thermal measurements while introducing new opportunities in the thermal domain that can be synergistically combined with optical approaches. We propose a theoretical framework to understand the TCD of individual and arrays of resonators covered by chiral molecules. To enhance the weak TCD of chiral samples, we first used individual dielectric Mie resonators and identified chirality transfer and self-heating as the underlying mechanisms giving rise to the differential temperature. However, inherent limitations imposed by the materials and geometries of such resonators make it challenging to surpass a certain level in enhancements. To overcome this, we suggest nonlocal thermal and electromagnetic interactions in the arrays. We predict that a combination of chirality transfer to Mie resonators, collective thermal effects, and optical lattice resonance could, in principle, offer more than four orders of magnitude enhancement in TCD. Our thermonanophotonic-based approach thus establishes key concepts for ultrasensitive chiral detection.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"233 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804648","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}

引用次数: 0

Correction to “Topological Insulator Bi2Se3 Heterojunction with a Low Dark Current for Midwave Infrared Photodetection”

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c02316

Tiange Zhao, Yue Chen, Tengfei Xu, Fang Zhong, Yiye Yu, Hang Ma, Kun Zhang, Shikun Duan, Jiapeng Hu, Shicheng Wang, Jiaxiang Guo, Zhen Wang

引用次数: 0

Photonic Convolution Accelerator Based on Electroabsorption-Modulated Multiwavelength DFB Laser 基于电吸收调制多波长 DFB 激光器的光子卷积加速器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c01594

Zhenxing Sun, Jie Zhao, Wentao Sun, Rulei Xiao, Jiale Xu, Pan Dai, Wenxuan Wang, Xiangfei Chen

引用次数: 0

Photonic Convolution Accelerator Based on Electroabsorption-Modulated Multiwavelength DFB Laser

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c0159410.1021/acsphotonics.4c01594

Zhenxing Sun, Jie Zhao, Wentao Sun, Rulei Xiao*, Jiale Xu, Pan Dai, Wenxuan Wang and Xiangfei Chen*,

{"title":"Photonic Convolution Accelerator Based on Electroabsorption-Modulated Multiwavelength DFB Laser","authors":"Zhenxing Sun, Jie Zhao, Wentao Sun, Rulei Xiao*, Jiale Xu, Pan Dai, Wenxuan Wang and Xiangfei Chen*, ","doi":"10.1021/acsphotonics.4c0159410.1021/acsphotonics.4c01594","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01594https://doi.org/10.1021/acsphotonics.4c01594","url":null,"abstract":"Given the challenges in integrating noncoherent optical convolution computing architectures, we have proposed and demonstrated a compact and efficient photonic convolutional accelerator (PCA) based on a monolithically integrated modulated multiwavelength source. A tiny footprint of 0.45 mm2 and a high compute density of 0.36 TOPS/mm2 are achieved by processing real-time recognition tasks using the MNIST handwritten digits database. In our scheme, except for delay lines and WDM devices that are not suitable for implementation on the InP-based platform, all other necessary devices are monolithically integrated on a chip. These include a uniformly spaced multiwavelength source (laser arrays based on REC technology), weight-loaded units (electrically power-tunable DFB lasers), modulators for signal input (electroabsorption modulated, EAM), and semiconductor optical amplifiers (SOA) for loss compensation. This study provides a compact and efficient InP-based solution for photonic convolutional neural networks (PCNNs).","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 12","pages":"5306–5313 5306–5313"},"PeriodicalIF":6.5,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842284","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}

引用次数: 0

Correction to “Topological Insulator Bi2Se3 Heterojunction with a Low Dark Current for Midwave Infrared Photodetection”

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c0231610.1021/acsphotonics.4c02316

Tiange Zhao, Yue Chen, Tengfei Xu*, Fang Zhong*, Yiye Yu, Hang Ma, Kun Zhang, Shikun Duan, Jiapeng Hu, Shicheng Wang, Jiaxiang Guo and Zhen Wang*,

引用次数: 0

Mapping and Optically Writing Nanogap Inhomogeneities in 1-D Extended Plasmonic Nanowire-on-Mirror Cavities

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c0144310.1021/acsphotonics.4c01443

Chetna Taneja, Eoin Elliott, G. V. Pavan Kumar, Jeremy J. Baumberg and Rohit Chikkaraddy*,

{"title":"Mapping and Optically Writing Nanogap Inhomogeneities in 1-D Extended Plasmonic Nanowire-on-Mirror Cavities","authors":"Chetna Taneja, Eoin Elliott, G. V. Pavan Kumar, Jeremy J. Baumberg and Rohit Chikkaraddy*, ","doi":"10.1021/acsphotonics.4c0144310.1021/acsphotonics.4c01443","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01443https://doi.org/10.1021/acsphotonics.4c01443","url":null,"abstract":"Tightly confined plasmons in metal nanogaps are highly sensitive to surface inhomogeneities and defects due to the nanoscale optical confinement, but tracking and monitoring their location is hard. Here, we probe a 1-D extended nanocavity using a plasmonic silver nanowire (AgNW) on mirror geometry. Morphological changes inside the nanocavity are induced locally using optical excitation and probed locally through simultaneous measurements of surface enhanced Raman scattering (SERS) and dark-field spectroscopy. The increasing molecular SERS intensity and corresponding redshift of cavity plasmon modes by up to 60 nm indicate atomic-scale changes inside the nanocavity. We correlate this to diffusion of silver atoms into the nanogap, which reduces the nanogap size and enhances the optical near-field, enhancing the SERS. These induced changes can be locally excited at specific locations along the length of the nanowire and remain stable and nonreversible. Polymer surface coating on the AgNW affects the power threshold for inducing atom migration and shows that strong polyvinylpyrrolidone (PVP)– Ag binding gives rise to higher power thresholds. Such extended nanogap cavities are an ideal system to provide robust SERS while withstanding high laser powers. These results provide insights into the inhomogeneities of NW nanocavities and pave the way toward spatially controlled NW lithography in ambient conditions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 12","pages":"5205–5214 5205–5214"},"PeriodicalIF":6.5,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01443","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142850406","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}

引用次数: 0

Mapping and Optically Writing Nanogap Inhomogeneities in 1-D Extended Plasmonic Nanowire-on-Mirror Cavities

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-10 DOI: 10.1021/acsphotonics.4c01443

Chetna Taneja, Eoin Elliott, G. V. Pavan Kumar, Jeremy J. Baumberg, Rohit Chikkaraddy

{"title":"Mapping and Optically Writing Nanogap Inhomogeneities in 1-D Extended Plasmonic Nanowire-on-Mirror Cavities","authors":"Chetna Taneja, Eoin Elliott, G. V. Pavan Kumar, Jeremy J. Baumberg, Rohit Chikkaraddy","doi":"10.1021/acsphotonics.4c01443","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01443","url":null,"abstract":"Tightly confined plasmons in metal nanogaps are highly sensitive to surface inhomogeneities and defects due to the nanoscale optical confinement, but tracking and monitoring their location is hard. Here, we probe a 1-D extended nanocavity using a plasmonic silver nanowire (AgNW) on mirror geometry. Morphological changes inside the nanocavity are induced locally using optical excitation and probed locally through simultaneous measurements of surface enhanced Raman scattering (SERS) and dark-field spectroscopy. The increasing molecular SERS intensity and corresponding redshift of cavity plasmon modes by up to 60 nm indicate atomic-scale changes inside the nanocavity. We correlate this to diffusion of silver atoms into the nanogap, which reduces the nanogap size and enhances the optical near-field, enhancing the SERS. These induced changes can be locally excited at specific locations along the length of the nanowire and remain stable and nonreversible. Polymer surface coating on the AgNW affects the power threshold for inducing atom migration and shows that strong polyvinylpyrrolidone (PVP)– Ag binding gives rise to higher power thresholds. Such extended nanogap cavities are an ideal system to provide robust SERS while withstanding high laser powers. These results provide insights into the inhomogeneities of NW nanocavities and pave the way toward spatially controlled NW lithography in ambient conditions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"20 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142797725","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}

引用次数: 0

Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-09 DOI: 10.1021/acsphotonics.4c01357

Marek Karzel, Anton K. Samusev, Tetiana L. Linnik, Mario Littmann, Dirk Reuter, Manfred Bayer, Alexey V. Scherbakov, Andrey V. Akimov

{"title":"Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering","authors":"Marek Karzel, Anton K. Samusev, Tetiana L. Linnik, Mario Littmann, Dirk Reuter, Manfred Bayer, Alexey V. Scherbakov, Andrey V. Akimov","doi":"10.1021/acsphotonics.4c01357","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01357","url":null,"abstract":"The interference of the incident light reflected from the surface of a medium and from a picosecond strain pulse propagating through it results in temporal oscillations of the reflected intensity. This phenomenon, called time-domain Brillouin scattering, enables us to gain information about the optical field inside the medium. The oscillation amplitude decreases with increase of the distance from the strain pulse to the surface if the incident light is strongly absorbed, while it remains constant if the medium is transparent. Here we exploit time domain Brillouin scattering to probe the optical field inside a multiple quantum well layer for light strongly coupling to excitons and forming polaritons. At low excitation density, we observe conventional Brillouin oscillations whose amplitude is small when the strain pulse is positioned far from the surface due to the strong absorption of polaritons in the vicinity of the exciton resonance. At elevated optical density, the absorption disappears, the medium becomes transparent, and the amplitude of the oscillations does not depend on the distance of the strain pulse from the surface. We explain this effect of polariton-induced transparency by the increase of the incoherent exciton density generated as result of polariton scattering. Finally, the increase of the exciton density leads to transition of the exciton gas to a collective state, resulting in collapse of the polariton state and propagation of the incident light in the medium without absorption.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"7 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142797729","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}

引用次数: 0

Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-09 DOI: 10.1021/acsphotonics.4c0135710.1021/acsphotonics.4c01357

Marek Karzel, Anton K. Samusev, Tetiana L. Linnik, Mario Littmann, Dirk Reuter, Manfred Bayer, Alexey V. Scherbakov* and Andrey V. Akimov*,

{"title":"Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering","authors":"Marek Karzel, Anton K. Samusev, Tetiana L. Linnik, Mario Littmann, Dirk Reuter, Manfred Bayer, Alexey V. Scherbakov* and Andrey V. Akimov*, ","doi":"10.1021/acsphotonics.4c0135710.1021/acsphotonics.4c01357","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01357https://doi.org/10.1021/acsphotonics.4c01357","url":null,"abstract":"The interference of the incident light reflected from the surface of a medium and from a picosecond strain pulse propagating through it results in temporal oscillations of the reflected intensity. This phenomenon, called time-domain Brillouin scattering, enables us to gain information about the optical field inside the medium. The oscillation amplitude decreases with increase of the distance from the strain pulse to the surface if the incident light is strongly absorbed, while it remains constant if the medium is transparent. Here we exploit time domain Brillouin scattering to probe the optical field inside a multiple quantum well layer for light strongly coupling to excitons and forming polaritons. At low excitation density, we observe conventional Brillouin oscillations whose amplitude is small when the strain pulse is positioned far from the surface due to the strong absorption of polaritons in the vicinity of the exciton resonance. At elevated optical density, the absorption disappears, the medium becomes transparent, and the amplitude of the oscillations does not depend on the distance of the strain pulse from the surface. We explain this effect of polariton-induced transparency by the increase of the incoherent exciton density generated as result of polariton scattering. Finally, the increase of the exciton density leads to transition of the exciton gas to a collective state, resulting in collapse of the polariton state and propagation of the incident light in the medium without absorption.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 12","pages":"5147–5154 5147–5154"},"PeriodicalIF":6.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01357","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142850073","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}

引用次数: 0

Quantum Efficiency and Vertical Position of Quantum Emitters in hBN Determined by Purcell Effect in Hybrid Metal-Dielectric Planar Photonic Structures

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-06 DOI: 10.1021/acsphotonics.4c01416

Domitille Gérard, Aurélie Pierret, Helmi Fartas, Bruno Berini, Stéphanie Buil, Jean-Pierre Hermier, Aymeric Delteil

{"title":"Quantum Efficiency and Vertical Position of Quantum Emitters in hBN Determined by Purcell Effect in Hybrid Metal-Dielectric Planar Photonic Structures","authors":"Domitille Gérard, Aurélie Pierret, Helmi Fartas, Bruno Berini, Stéphanie Buil, Jean-Pierre Hermier, Aymeric Delteil","doi":"10.1021/acsphotonics.4c01416","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01416","url":null,"abstract":"Color centers in hexagonal boron nitride (hBN) advantageously combine excellent photophysical properties with the potential for integration in highly compact devices. Progress toward scalable integration necessitates a high quantum efficiency and an efficient photon collection. In this context, we compare the optical characteristics of individual hBN color centers generated by electron irradiation in two different electromagnetic environments. We keep track of well-identified emitters that we characterize before and after the dry transfer of exfoliated crystals. This comparison provides information about their quantum efficiency, which we find close to unity, as well as their vertical position in the crystal with nanometric precision, which we find away from the flake surfaces. Our work suggests hybrid dielectric-metal planar structures as an efficient tool for characterizing quantum emitters in addition to improving the count rate and can be generalized to other emitters in 2D materials or in planar photonic structures.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"17 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142783139","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}

引用次数: 0