Nanophotonics最新文献

{"title":"Janus metagrating for tailoring direction-dependent wavefronts","authors":"Zhen Tan, Jianjia Yi, Shah Nawaz Burokur","doi":"10.1515/nanoph-2025-0140","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0140","url":null,"abstract":"Janus metasurfaces have emerged as a promising platform to enable independent wave manipulation by fully exploiting the inherent propagation direction of electromagnetic waves. These structures allow achieving distinct wavefront functionalities based on the direction of wave propagation. Concurrently, metagratings have gathered significant attention as an innovative design scheme for wavefront manipulation, particularly in addressing the low efficiency issue commonly associated with conventional metasurfaces. This study introduces Janus metagratings as a means for tailoring efficient, direction-dependent absorption and reflection. Utilizing established analytical models, a precise analysis of diffraction modes is conducted in transmissive metagratings, facilitating asymmetric wavefront manipulation under the two incidence directions. By arranging distinct meta-atoms with specific load impedances on the upper and lower layers of the metagrating, efficient asymmetric wave responses are achieved. The design methodology is validated through full-wave simulations, which demonstrate strong consistency with theoretical predictions. Additionally, a Janus metagrating prototype is fabricated and tested in the microwave frequency regime, validating the direction-dependent wavefronts tailoring characteristics. The proposed design methodology offers a versatile platform for asymmetric propagation and advanced systems in future wireless and optical communication applications.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"80 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Nonlocal metasurfaces: universal modal maps governed by a nonlocal generalized Snell’s law","authors":"Adam Overvig, Francesco Monticone","doi":"10.1515/nanoph-2025-0051","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0051","url":null,"abstract":"In this opinion, we describe the potential of an emerging class of flat optics known as “nonlocal metasurfaces” to manipulate light in both real space and momentum space. While the ultimate form of a conventional “local” metasurface can be viewed as a universal generator of any desired waveform from a fixed input wavefront, the ultimate form of a nonlocal metasurface would instead act as a universal “map” from a given set of input waveforms to a set of orthogonal output waveforms. Here, we discuss how this implies four-dimensional information capacity, drastically enhancing information density compared to local metasurfaces. We discuss a framework using scattering matrices and a nonlocal generalized Snell’s law to describe nonlocal metasurfaces. We comment on the potential, progress, and practicality of this ambitious vision, suggesting limitations and next steps.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"59 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Bi-stability and period-doubling cascade of frequency combs in exceptional-point lasers","authors":"Xingwei Gao, Hao He, Weng W. Chow, Alexander Cerjan, Chia Wei Hsu","doi":"10.1515/nanoph-2025-0069","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0069","url":null,"abstract":"Recent studies have demonstrated that a laser can self-generate frequency combs when tuned near an exceptional point (EP), where two cavity modes coalesce. These EP combs induce periodic modulation of the population inversion in the gain medium, and their repetition rate is independent of the laser cavity’s free spectral range. In this work, we perform a stability analysis that reveals two notable properties of EP combs, bi-stability and a period-doubling cascade. The period-doubling cascade enables halving of the repetition rate while maintaining the comb’s total bandwidth, presenting opportunities for the design of highly compact frequency comb generators.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"72 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Tunable quantum light by modulated free electrons","authors":"Valerio Di Giulio, Rudolf Haindl, Claus Ropers","doi":"10.1515/nanoph-2025-0040","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0040","url":null,"abstract":"Nonclassical states of light are fundamental in various applications, spanning quantum computation to enhanced sensing. Fast free electrons, which emit light into photonic structures through the mechanism of spontaneous emission, represent a promising platform for generating diverse types of states. Indeed, the intrinsic connection between the input electron wave function and the output light field suggests that electron-shaping schemes, based on light-induced scattering, facilitate their synthesis. In this article, we present a theoretical framework capable of predicting the final optical density matrix emitted by a generic <jats:italic>N</jats:italic>-electron state that can also account for post-sample energy filtering. By using such a framework, we study the modulation-dependent fluctuations of the <jats:italic>N</jats:italic>-electron emission and identify regions of superradiant scaling characterized by Poissonian and super-Poissonian statistics. In this context, we predict that high-<jats:italic>N</jats:italic> modulated electron pulses can yield a tenfold shot-noise suppression in the estimation of the electron-light coupling when the output radiation intensity is analyzed. In the single-electron case, we show how coherent states with nearly 90 % purity can be formed by pre-filtering a portion of the spectrum after modulation, and how non-Gaussian states are generated after a precise energy measurement. Furthermore, we present a strategy combining a single-stage electron modulation and post-filtering to harness tailored light states, such as squeezed vacuum, cat, and triangular cat states, with fidelities close to 100 %.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"4 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Quasi-bound states in the continuum in finite waveguide grating couplers","authors":"Torgom Yezekyan, Roza Gabrielyan, Sergey I. Bozhevolnyi","doi":"10.1515/nanoph-2024-0731","DOIUrl":"https://doi.org/10.1515/nanoph-2024-0731","url":null,"abstract":"Finite-size effects occurring for quasi-bound states in the continuum (qBICs) formed in symmetric and asymmetric all-dielectric waveguide grating couplers are investigated using numerical simulations for different configuration parameters. We find that the beam size plays a crucial role in the formation of additional qBIC resonances originating in forbidden for plane-wave incidence BIC resonances, whose manifestation is strongly influenced by the beam divergence. Another parameter is the strength of Bragg reflection, determining the spatial extension of a distributed Bragg resonator (DBR): in configurations with strong Bragg reflection, the excited and Bragg reflected counterpropagating waveguide modes are confined within the footprint of the incident beam. Conversely, the DBR formed in configurations with weak Bragg reflection extends well beyond the incident beam footprint, resulting in high sensitivity of the system response to the grating width and incident beam position. We believe that our findings provide valuable insights for optimizing photonic devices that leverage qBIC resonances in finite-sized structures under realistic excitation conditions.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"133 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Solid-state single-photon sources operating in the telecom wavelength range","authors":"Paweł Holewa, Andreas Reiserer, Tobias Heindel, Stefano Sanguinetti, Alexander Huck, Elizaveta Semenova","doi":"10.1515/nanoph-2024-0747","DOIUrl":"https://doi.org/10.1515/nanoph-2024-0747","url":null,"abstract":"Solid-state quantum emitters operating in the telecom wavelength range are pivotal for the development of scalable quantum information processing technologies. In this review, we provide a comprehensive overview of the state-of-the-art solid-state emitters of single photons targeting quantum information processing in the discrete-variable regime and telecom wavelength range. We focus on quantum dots, color centers, and erbium ion dopants, detailing their synthesis methods and their applications. The review addresses the strategies for the integration of these quantum emitters into photonic devices alongside the associated challenges. We also discuss their applications in quantum technologies, examining current limitations, including performance constraints, decoherence, and scalability. Finally, we propose future directions for advancing photonic-based quantum technologies.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"1 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143979506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Polaritonic quantum matter","authors":"D.N. Basov, Ana Asenjo-Garcia, P. James Schuck, Xiaoyang Zhu, Angel Rubio, Andrea Cavalleri, Milan Delor, Michael M. Fogler, Mengkun Liu","doi":"10.1515/nanoph-2025-0001","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0001","url":null,"abstract":"Polaritons are quantum mechanical superpositions of photon states with elementary excitations in molecules and solids. The light–matter admixture causes a characteristic frequency-momentum dispersion shared by all polaritons irrespective of the microscopic nature of material excitations that could entail charge, spin, lattice or orbital effects. Polaritons retain the strong nonlinearities of their matter component and simultaneously inherit ray-like propagation of light. Polaritons prompt new properties, enable new opportunities for spectroscopy/imaging, empower quantum simulations and give rise to new forms of synthetic quantum matter. Here, we review the emergent effects rooted in polaritonic quasiparticles in a wide variety of their physical implementations. We present a broad portfolio of the physical platforms and phenomena of what we term <jats:italic>polaritonic quantum matter.</jats:italic> We discuss the unifying aspects of polaritons across different platforms and physical implementations and focus on recent developments in: polaritonic imaging, cavity electrodynamics and cavity materials engineering, topology and nonlinearities, as well as quantum polaritonics.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"25 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Topological momentum skyrmions in Mie scattering fields","authors":"Peiyang Chen, Kai Xiang Lee, Tim Colin Meiler, Yijie Shen","doi":"10.1515/nanoph-2025-0071","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0071","url":null,"abstract":"How topologies play a role in light–matter interaction is of great interest in control and transfer of topologically-protected structures. These topological structures such as skyrmions and merons have not yet been found in canonical momentum fields, which are fundamental in mechanical transfer between optical and matter fields. Here, we reveal the universality of generating skyrmionic structures in the canonical momentum of light in multipole Mie scattering fields. We demonstrate the distinct topological stability of canonical momentum skyrmions and merons, and compare with well-studied Poynting vector and optical spin fields. The study of these fields allow for a clean and direct approach to measuring and quantifying energetic structures in optical fields, through observable radiation pressure. Our work lays the foundation for exploring new topologically nontrivial phenomena in optical forces, metamaterial design, and light–matter interaction.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"43 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143910077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Active metasurface designs for lensless and detector-limited imaging","authors":"Julie Belleville, Prachi Thureja, Harry A. Atwater","doi":"10.1515/nanoph-2024-0704","DOIUrl":"https://doi.org/10.1515/nanoph-2024-0704","url":null,"abstract":"The emergence of metasurfaces has enabled lightweight, compact imaging with degrees of freedom which previously required complex optical setups to achieve, such as polarization, wave vector, and spectrum. To date, most metasurface-enabled imaging systems have thus far been ‘passive’, and therefore subject to fundamental information and thickness limits set by the coupling of light to their sensor arrays. We discuss the use of active metasurfaces in low form-factor and low pixel-count imaging systems and introduce a prototypical lensless imaging system concept which employs an active metasurface as a high-frequency, continuously tunable amplitude and phase modulation aperture, coupled to a discrete single-pixel detector. We analyze the scalability of such a platform and computationally demonstrate that a scalable ‘perimeter-control’ addressing architecture – in which a <jats:italic>M</jats:italic> × <jats:italic>N</jats:italic> rectangular array of scattering elements is addressed by only <jats:italic>M</jats:italic> + <jats:italic>N</jats:italic> voltages – is sufficient for image collection, even when scatterers exhibit limited <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mfenced close=\")\" open=\"(\"> <m:mrow> <m:msup> <m:mrow> <m:mn>272</m:mn> </m:mrow> <m:mrow> <m:mo>◦</m:mo> </m:mrow> </m:msup> </m:mrow> </m:mfenced> </m:math> <jats:tex-math>$left({272}^{{circ}}right)$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_nanoph-2024-0704_ineq_001.png\"/> </jats:alternatives> </jats:inline-formula> phase control, and undesired amplitude variations. We also address fundamental limits in information collection, image aberrations, and signal-to-noise ratio, highlighting key advantages, limitations, and trade-offs for active metasurface imaging. We generalize our discussion to other active metasurface-enabled imaging configurations and applications. Finally, we consider promising active metasurface material platforms with an outlook towards new directions to enable high-efficiency imaging.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"34 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"The theory of the quantum walk comb laser","authors":"Alexander Dikopoltsev, Ina Heckelmann, Barbara Schneider, Mathieu Bertrand, Jérôme Faist","doi":"10.1515/nanoph-2024-0768","DOIUrl":"https://doi.org/10.1515/nanoph-2024-0768","url":null,"abstract":"The development of on-chip optical frequency comb devices paves the way for novel applications in environmental tracking, fast ranging and smart communication solutions. Recently, a new type of frequency comb device, based on a modulated ring quantum cascade laser, was introduced and demonstrated. Here we present a rigorous theoretical study of this type of device, also known as the quantum walk comb laser. We show that resonant phase modulation of a fast gain laser with a dispersive circular cavity is sufficient to support a broadband comb. This method requires the gain to have a sufficiently fast recovery time to support quasi-instantaneous suppression of intensity fluctuations. When this condition is met, the modulation leads to quantum walk dynamics, and then to stabilization onto a stable and controllable frequency comb. We show this type of dynamics through simulations using realistic parameters and reveal the impact of higher-order contributions from gain and dispersion. We also study the resilience of this type of mode-locked laser to noise injection and show its superiority to that of active mode-locking. We believe that this work will allow the development of comb devices with high wall-plug efficiency, arbitrary output spectral shaping and increased stability properties.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"6 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}