Nature Photonics最新文献

{"title":"Space-time-topological events in photonic quantum walks","authors":"Joshua Feis, Sebastian Weidemann, Tom Sheppard, Hannah M. Price, Alexander Szameit","doi":"10.1038/s41566-025-01653-w","DOIUrl":"https://doi.org/10.1038/s41566-025-01653-w","url":null,"abstract":"<p>Time is, figuratively and literally, becoming the new dimension for crystalline matter. In a key recent advance, temporal and spatiotemporal crystals that exhibit periodicity in time and space-time, respectively, were reported, with unique properties such as spectra containing gaps not only in energy but also in momentum. Conversely, the field of topological physics, which has led to celebrated discoveries such as topological insulators featuring protected conducting surface states with immunity to backscattering, has so far been based on the notion of energy gaps and spatial boundaries only. Fundamentally rethinking the role of time, which in contrast to space exhibits a unique unidirectionality called the ‘arrow of time’, thus promises a new dimension for topological physics, setting paradigms of time and space-time topology based on the topological properties of momentum and energy–momentum gaps. Indeed, previous work has shown simulations of states which arise through the topology of momentum gaps and localize at temporal interfaces. Here we enter this new dimension of time and space-time topology. First, using discrete-time quantum walks on synthetic photonic lattices in coupled optical fibre loops, we observe such time topological states. We find a time-topological invariant and establish its relation to the observed time topological states. Transcending the separate concepts of space and time topology, we then propose and implement a system with an energy–momentum gap and introduce the concept of space-time topology, leading to topological states that are localized in both space and time, thus forming space-time topological events. We demonstrate that these are associated with unique effects such as causality-suppressed coupling or the limited collapse of space-time localization. Our study provides a model of time and space-time topology, highlighting an interplay of momentum and energy gap topology with applicability beyond photonics. In the field of topological physics, we anticipate a new role of causality and non-Hermiticity inspired by time and space-time topology. These concepts further invite exploration of connections to other fields where the arrow of time plays an important role. Moreover, our results enable the topological shaping of waves in space and time, with applications in spatiotemporal wave control for imaging or communication and topological lasers, for example.</p>","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"24 1","pages":""},"PeriodicalIF":35.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775700","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}

{"title":"Exploiting 2D materials","authors":"Rachel Won","doi":"10.1038/s41566-025-01656-7","DOIUrl":"10.1038/s41566-025-01656-7","url":null,"abstract":"Two-dimensional materials have revolutionized the field of photonics by enabling the manipulation of light at the nanoscale. As their potential continues to grow, we can expect to see more innovative applications emerging in the future.","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"348-349"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770677","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}

{"title":"Intertwining with Fourier optics","authors":"José Azaña","doi":"10.1038/s41566-025-01652-x","DOIUrl":"10.1038/s41566-025-01652-x","url":null,"abstract":"An angular Fourier optics framework has been established and demonstrated, unlocking unprecedented opportunities for the analysis and manipulation of light waves carrying orbital angular momentum.","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"340-343"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770674","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}

{"title":"Polarized white-light emission from organic semiconductors","authors":"Huanyu Zhou,&nbsp;Antonio Facchetti","doi":"10.1038/s41566-025-01641-0","DOIUrl":"10.1038/s41566-025-01641-0","url":null,"abstract":"Intrinsically polarized white-light emission is highly demanded for many applications. It is now possible to realize it via a bimolecular doping strategy of organic semiconductor single crystals, overcoming long-standing limitations in organic emitters.","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"338-339"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770678","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}

{"title":"Neuromorphic photonics for efficient computing","authors":"Giampaolo Pitruzzello","doi":"10.1038/s41566-025-01654-9","DOIUrl":"10.1038/s41566-025-01654-9","url":null,"abstract":"Neuromorphic photonic systems mimicking biological neurons promise to boost the efficiency of light-based computing.","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"350-351"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770679","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}

{"title":"Dual comb on a chip targets compact optical clocks","authors":"Pablo Acedo","doi":"10.1038/s41566-025-01649-6","DOIUrl":"10.1038/s41566-025-01649-6","url":null,"abstract":"A vernier dual frequency comb provides a chip-based highly precise reference between the optical and radio frequency domains.","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"344-346"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770672","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}

{"title":"Continuing the diversity conversation","authors":"Elizabeth von Hauff","doi":"10.1038/s41566-025-01647-8","DOIUrl":"10.1038/s41566-025-01647-8","url":null,"abstract":"","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"337-337"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770676","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}

{"title":"An adaptive moiré sensor for spectro-polarimetric hyperimaging","authors":"Haoning Tang, Beicheng Lou, Fan Du, Guangqi Gao, Mingjie Zhang, Xueqi Ni, Evelyn Hu, Amir Yacoby, Yuan Cao, Shanhui Fan, Eric Mazur","doi":"10.1038/s41566-025-01650-z","DOIUrl":"https://doi.org/10.1038/s41566-025-01650-z","url":null,"abstract":"<p>Moiré photonic structures permit the engineering of optical band structures and light–matter interactions, offering new opportunities in photonics and optoelectronics, paving the way for new nanophotonic applications such as ultra-low threshold lasing, and versatile nonlinear and quantum light sources; however, the lack of in situ tunability has limited the potential of these structures until now. For example, the lack of control of the twist angle is an obstacle to high-resolution material spectroscopy and the development of new applications that require moiré optical properties. Here we present a microelectromechanical system (MEMS)-integrated twisted moiré photonic crystal sensor with a tunable interlayer distance and twist angle. The MEMS actuators modulate the wavelength and polarization resonances of the photonic crystal sensor via a twist- and gap-tuned moiré scattering effect. Using a reconstruction algorithm, this chip-based sensor can be used to simultaneously resolve the spectrum and polarization state of a wide-band signal in the telecommunications range and the full Poincaré sphere. We also demonstrate hyperspectral and hyperpolarimetric imaging using this single sensor. Our research illustrates some of the remarkable applications of multidimensional control of degrees of freedom in twisted moiré photonic platforms and establishes a scalable pathway towards creating comprehensive flat-optics devices suitable for versatile light manipulation and information processing.</p>","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"32 1","pages":""},"PeriodicalIF":35.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766453","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}

{"title":"Breaking down plastics with light","authors":"David Pile","doi":"10.1038/s41566-025-01655-8","DOIUrl":"10.1038/s41566-025-01655-8","url":null,"abstract":"","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"19 4","pages":"347-347"},"PeriodicalIF":32.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770673","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}

{"title":"Generation of ultrafast magnetic steps for coherent control","authors":"G. De Vecchi, G. Jotzu, M. Buzzi, S. Fava, T. Gebert, M. Fechner, A. V. Kimel, A. Cavalleri","doi":"10.1038/s41566-025-01651-y","DOIUrl":"https://doi.org/10.1038/s41566-025-01651-y","url":null,"abstract":"<p>A long-standing challenge in ultrafast magnetism and functional materials research, in general, has been the generation of a universal, ultrafast stimulus able to switch between stable magnetic states. Solving this problem would open up many new opportunities for fundamental studies, potentially impacting future data storage technologies. Ideally, step-like magnetic field transients with infinitely fast rise time would serve this purpose. Here we develop a new approach to generate ultrafast magnetic field steps by quenching supercurrents in a superconductor. We achieve magnetic field steps with millitesla amplitude, picosecond rise times and slew rates approaching 1 GT s^–1. We test the potential of this technique by coherently rotating the magnetization in a ferrimagnet. Although in the current geometry, the magnetic field step is not sufficient to achieve complete switching, suitable improvements in the device geometry could make these magnetic steps both larger and faster. We foresee new applications ranging from quenches across phase transitions to complete switching of magnetic order parameters.</p>","PeriodicalId":18926,"journal":{"name":"Nature Photonics","volume":"28 1","pages":""},"PeriodicalIF":35.0,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758207","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}