Nanophotonics最新文献

{"title":"Solitons in ultrafast semiconductor lasers with saturable absorber","authors":"Luigi Lugiato, Franco Prati, Massimo Brambilla, Lorenzo Luigi Columbo","doi":"10.1515/nanoph-2025-0057","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0057","url":null,"abstract":"We describe structure localization and dissipative solitons in a semiconductor laser with a saturable absorber exhibiting gain/absorption recovery times shorter than the photon lifetime. Under assumptions compatible with QCL characteristics and graphene-based absorbers, we study the existence and stability of solitons, along with their dynamical behavior. Numerical simulations confirm the robustness of our predictions. This evidence hints at promising pathways to realize passive mode locking in ultrafast lasers, implying highly valuable application prospects.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"3 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905874","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":"Combining quantum cascade lasers and plasmonic metasurfaces to monitor de novo lipogenesis with vibrational contrast microscopy","authors":"Steven H. Huang, Dias Tulegenov, Gennady Shvets","doi":"10.1515/nanoph-2025-0014","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0014","url":null,"abstract":"The combination of a tunable quantum cascade laser (QCL) and plasmonic mid-infrared (MIR) metasurface is a powerful tool enabling high-content microscopy of hydrated cells using the vibrational contrast of their constituent biomolecules. While the QCL provides a high-brightness source whose frequency can be rapidly tuned to that of the relevant molecular vibration, the metasurface is used to overcome water absorption of MIR light. Here we employ the resulting metasurface-enabled inverted reflected-light infrared absorption microscopy (MIRIAM) tool for non-destructive monitoring of the vital process of <jats:italic>de novo</jats:italic> lipogenesis (DNL), by which fat tissue cells (adipocytes) synthesize fatty acids from glucose and store them inside lipid droplets. Using <jats:sup>13</jats:sup>C-labeled glucose as a metabolic probe, we produce spatially- and temporally-resolved images of <jats:sup>13</jats:sup>C incorporation into lipids and proteins, observed as red-shifted vibrational peaks in the MIR spectra. These findings demonstrate MIRIAM’s capability for studying metabolic pathways with molecular specificity, offering a powerful platform for metabolic imaging.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"32 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905875","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":"Exciton–polariton condensation in MAPbI3 films from bound states in the continuum metasurfaces","authors":"Marco Marangi, Andrea Zacheo, Alexander M. Dubrovkin, Giorgio Adamo, Cesare Soci","doi":"10.1515/nanoph-2025-0128","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0128","url":null,"abstract":"Exciton–polariton condensation in optical resonators is a fascinating pathway to realise ultra-coherent states of light, underpinned by Bose–Einstein quasiparticles. Bearing inherently non-radiative nature, bound states in continuum (BIC) have proven to be an excellent platform to achieve polariton condensation. Here, we report exciton–polariton condensation in a solution-processed perovskite thin film hybridized with a silicon BIC metasurface. Thanks to the high quality factor of the BIC, the polariton condensation exhibits low fluence threshold, narrow linewidth, and large spatial and temporal coherence. These results demonstrate the feasibility of integration of perovskite polaritonic devices in scalable silicon photonic platforms.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"299 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905876","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":"Inhomogeneous broadening in the time domain","authors":"Ludmila J. Prokopeva, Alexander V. Kildishev","doi":"10.1515/nanoph-2025-0044","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0044","url":null,"abstract":"Forty-five years after the initial attempts – first by Efimov–Khitrov in 1979, then by Brendel–Bormann in 1992 – we present a comprehensive, causal, and physically consistent framework for modeling the dielectric function with inhomogeneous (non-Lorentzian) broadening, where scattering becomes frequency- or time-dependent. This theoretical framework is based on spectral diffusion, described in the frequency domain by a complex probability density function and in the time domain by a matching characteristic function. The proposed approach accurately models the lineshapes resulting from multiple broadening mechanisms and enables the retrieval of intrinsic homogeneous linewidths as well as inhomogeneous disorder-controlled material dispersion features. To implement the new general dispersion function in time-domain Maxwell solvers, we have designed a constrained minimax-based semi-analytical approximation method (MiMOSA) that generates the shortest possible numerical stencils for a given approximation error. Application examples of exact and approximate MiMOSA models include the Gauss–Lorentz oscillator, Gauss–Debye relaxation, and Gauss–Drude conductivity. Although this study primarily focuses on the optical domain, the resulting models, which account for the Doppler shift, are equally applicable to other wave propagation phenomena in disordered dispersive media in a broad range of areas, including acoustics, magnonics, astrophysics, seismology, plasma, and quantum technologies.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"58 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144778495","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":"Dual-mode varifocal Moiré metalens for quantitative phase and edge-enhanced imaging","authors":"Yi Lian, Yongqi Liu, Dewen Cheng, Cheng Chi, Yanjun Bao, Yongtian Wang","doi":"10.1515/nanoph-2025-0245","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0245","url":null,"abstract":"Transport-of-intensity equation (TIE) as a noninterference method for quantitative phase imaging (QPI) has broad applications in micrographic imaging and optical metrology. Previous TIE-based QPI systems require the axial displacement of the detector to capture the axial intensity distributions, thus limiting the systems’ response speed, integration, and phase retrieval accuracy. Besides, the TIE-based phase imaging for edge positions with large phase gradients remains challenging. In this work, a compact polarization-multiplexed Moiré metalens is proposed to achieve QPI and edge-enhanced imaging for high-precision and unwrapping phase imaging. This Moiré metalens enables continuous zooming from 58.7 μm to 61.8 μm, allowing flexible selection of the detection positions. Under <jats:italic>x</jats:italic>-polarization light incidence, the metalens can achieve phase retrieval based on the TIE method, with the Root Mean Square Errors (RMSE) reaching 0.015 rad. Under <jats:italic>y</jats:italic>-polarization light incidence, the metalens realizes varifocal edge-enhanced imaging for amplitude and phase objects, with a minimum spatial resolution of 1.3 μm. This Moiré metalens opens a new avenue to develop compact, integrated, and multifunctional phase imaging devices and has potential applications in optical detection, microscopy, and biomedical imaging.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"30 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786592","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":"Guided nonlinear optics for information processing.","authors":"Daniel Brunner,Birgit Stiller,Demetri Psaltis","doi":"10.1515/nanoph-2025-0348","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0348","url":null,"abstract":"","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"20 1","pages":"2709-2710"},"PeriodicalIF":7.5,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825906","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":"Cascades of quasi-bound states in the continuum","authors":"Nikolay Solodovchenko, Mikhail Bochkarev, Kirill Samusev, Mikhail Limonov","doi":"10.1515/nanoph-2025-0238","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0238","url":null,"abstract":"Future technologies aim to radically increase photonic integration, which can be achieved either by structuring the materials or by cleverly manipulating photonic resonances. The latter method involves several tunable resonant modes in a single simple structure. Here we demonstrate experimentally and theoretically the existence of multiple cascades of quasi-bound states in the continuum in single dielectric resonators with rectangular cross sections – in rings, split rings, and cuboids, which form the basis of modern photonics. The effect is determined by the photonic structure of such resonators: it consists of individual galleries, each starting with a transverse Fabry–Pérot-like resonance in height or width and continuing with an equidistant sequence of longitudinal modes. When only one of the transverse dimensions in the spectrum changes, only one gallery type is predominantly shifted, leading to the avoiding crossings with the other gallery and the formation of multiple cascades of quasi-bound states in the continuum via the Friedrich–Wintgen mechanism. This “Fabry–Pérot-tronic” has an obvious advantage over the “Mie-tronic”, whose only variable geometric parameter is the radius of the sphere. Such single dielectric resonators with cascades of quasi-bound states in the continuum can become building blocks for multichannel sensors, antennas, amplifiers, and lasers with a wide range of equidistant generation frequencies; in addition, such a simple resonator creates a new platform for multifrequency sensing using machine learning.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"16 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786587","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":"Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides","authors":"Simin Yu, Mingyue Qi, Huizong Zhu, Bofu Zhao, Jingchun Qian, Yiqun Wu, Qiushi Chen, Juanjuan Lu","doi":"10.1515/nanoph-2025-0201","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0201","url":null,"abstract":"Thin-film lithium tantalate (TFLT) has recently emerged as a promising photonic platform for chip-scale nonlinear optics due to its weaker photorefraction, higher optical damage threshold, broader transparency window, and lower birefringence compared to that of thin-film lithium niobate. Here we report the first functional second harmonic generator achieved through high-fidelity poling of z-cut TFLT waveguides, based on a low-loss lithium tantalate integrated photonic platform. As a result, quasi-phase matching is performed between telecom (1,550 nm) and near-visible (775 nm) wavelengths in a straight waveguide and prompts strong second-harmonic generation with a normalized efficiency of 229 %/(W·cm<jats:sup>2</jats:sup>). An absolute conversion efficiency of 5.5 % is achieved with a pump power of 700 mW in the waveguide. Such a second-harmonic generator exhibits stable temperature tunability (−0.44 nm/°C), which is important for applications that require precise frequency alignment such as atomic clocks and quantum frequency conversion.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"52 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144778437","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":"Direct measurement of two-photon absorption and refraction properties of SZ2080TM-based resists at 515 nm: insights into 3D printing","authors":"Michalis Stavrou, Dimitra Ladika, Edvinas Skliutas, Vytautas Jukna, David Gray, Maria Farsari, Saulius Juodkazis, Mangirdas Malinauskas","doi":"10.1515/nanoph-2025-0066","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0066","url":null,"abstract":"Accurate knowledge of nonlinear optical parameters is essential for optimizing energy deposition in ultrafast laser 3D printing, yet these values remain undetermined for many commonly used materials. In this study, we address this gap by experimentally determining the two-photon absorption (TPA) and non-linear refraction coefficients (<jats:italic>β</jats:italic> and <jats:italic>n</jats:italic> <jats:sub>2</jats:sub>) of the widely used SZ2080<jats:sup>TM</jats:sup> resist with the photo-initiators (PI) IRG369 and BIS (Irgacure 369 and 4,4′ bis(diethylamino)-benzophenone or Michler’s ketone). Using the Z-scan method at 515 nm with a low repetition rate (1 kHz) to avoid thermal accumulation, we found that the nonlinear response of the host polymer has a considerable contribution to energy deposition despite the addition of the PI, as the host polymer makes up the majority of 99 % in the solution. The TPA cross section <jats:italic>σ</jats:italic> were 5.7 ± 0.4 GM (1 GM = 10<jats:sup>−50</jats:sup> cm<jats:sup>4</jats:sup> s photon<jats:sup>−1</jats:sup>) for pure SZ2080<jats:sup>TM</jats:sup>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mo>∼</m:mo> <m:mn>40</m:mn> </m:math> <jats:tex-math>$sim 40$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_nanoph-2025-0066_ineq_001.png\"/> </jats:alternatives> </jats:inline-formula> GM for IRG and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mo>∼</m:mo> <m:mn>87</m:mn> </m:math> <jats:tex-math>$sim 87$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_nanoph-2025-0066_ineq_002.png\"/> </jats:alternatives> </jats:inline-formula> GM for BIS at 515 nm. The nonlinear refractive index <jats:italic>n</jats:italic> <jats:sub>2</jats:sub> for pure polymer was (85.3 ± 6) × 10<jats:sup>−5</jats:sup> cm<jats:sup>2</jats:sup>/TW, favoring a self-focusing, and was larger than that for PIs: <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mo>∼</m:mo> <m:mn>16</m:mn> <m:mo>×</m:mo> <m:mn>1</m:mn> <m:msup> <m:mrow> <m:mn>0</m:mn> </m:mrow> <m:mrow> <m:mo>−</m:mo> <m:mn>5</m:mn> </m:mrow> </m:msup> </m:math> <jats:tex-math>$sim 16{times}1{0}^{-5}$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_nanoph-2025-0066_ineq_003.png\"/> </jats:alternatives> </jats:inline-formula> cm<jats:sup>2</jats:sup>/TW (IRG369) and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <m:mo>∼</m:mo> <m:mn>2.8</m:mn> <m:mo>×</m:mo> <m:mn>1</m:mn> <m:msup> <m:mrow> <m:mn>0</m:mn> </m:mrow> <m:mrow> <m:mo>−</m:mo> <m:mn>5</m:mn> </m:mrow> </m:msup> </m:math> <jats:tex-math>$sim 2.8{times}1{0}^{-5}$</jats:tex-math> <jats:inlin","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"30 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144769969","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":"Temporal interface in dispersive hyperbolic media","authors":"Grigorii Ptitcyn, Diego M. Solís, Mohammad Sajjad Mirmoosa, Nader Engheta","doi":"10.1515/nanoph-2025-0065","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0065","url":null,"abstract":"Spatial inhomogeneity, temporal modulation, and engineered anisotropy of parameters of electromagnetic media offer numerous opportunities for manipulating light–matter interaction over the past decades. Here, we investigate a scenario in which we deal with the temporal interface, hyperbolic anisotropy in the form of layered structures, and frequency dispersion. We theoretically investigate how a monochromatic uniform plane wave – propagating in an unbounded, homogeneous, isotropic dielectric medium – undergoes changes due to the rapid temporal variation of such medium into a hyperbolic dispersive medium formed by the stack of thin metal–dielectric bilayers, in which the metal follows the lossless Drude dispersion and the dielectric is assumed to be dispersionless. We corroborate our analytical results by numerical simulations. We observe several interesting phenomena, such as conversion of the original frequency into three pairs of frequencies, resulting in three sets of forward (FW) and backward (BW) waves. We present the amplitudes and the time-averaged Poynting vectors for such FW and BW waves and discuss some of the salient features of such temporal interface.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"45 1 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144769970","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}