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Infrared phononic nanoantennas:Localized surface phonon polaritons in SiC disks

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Chinese Science Bulletin 2010年第24期55卷 2625-2628页

作者： AMEEN Mohamed GARCIA-ETXARRI Aitzol SCHNELL Martin HILLENBRAND Rainer aizpurua javier Department of Materials Physics University of the Basque Country UPV/EHU Centro Mixto de Física de Materiales CSIC-UPV/EHU and Donostia International Physics Centre Nanooptics Group CIC Nanogune Consolider Ikerbasque

The electromagnetic interaction of light with polar materials shows a sharp and well defined electromagnetic response in the infrared(IR)region that consists mainly of excitation of optical *** to surface plasmons in the visible region,surface phonons can couple efficiently to infrared light in micron-sized antennas made of polar *** applied the boundary element method to calculating the infrared electromagnetic response of single SiC disks acting as effective infrared antennas as a function of different parameters such as disk size and *** also analyzed the effect of locating a probing metallic tip near the SiC disk to scatter light in the proximity of the SiC disk,thereby obtaining new spectral peaks connected with localized modes between the tip and the SiC *** then further investigated their application in IR scanning probe microscopy.A near-field map of the phononic resonances enhances the understanding of the nature of the IR extinction peaks.

关键词：表面声子碳化硅光磁盘红外线极化激元扫描探针显微技术电磁相互作用电磁响应

Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide

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Light(Science & Applications) 2016年第1期5卷 415-423页

作者： Otto L Muskens Luca Bergamini Yudong Wang Jeffrey M Gaskell Nerea Zabala CH de Groot David W Sheel javier aizpurua Physics and Astronomy Faculty of Physical Sciences and EngineeringUniversity of SouthamptonSouthampton SO171BJUK Department of Electricity and Electronics FCTZTFUPV-EHUBilbao 48080Spain Materials Physics Center CSIC-UPV/EHU and DIPCSan Sebastian 20018Spain Nano Group Faculty of Physical Sciences and EngineeringUniversity of SouthamptonSouthampton SO171BJUK Materials and Physics Research Centre University of SalfordManchester M54WTUK

Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for next-generation optoelectronic *** exhibiting a structural or electronic phase transition offer a large modulation contrast with multi-level optical switching and memory *** addition,plasmonic nanoantennas can provide an efficient enhancement mechanism for both the optically induced excitation and the readout of materials strategically positioned in their local ***,we demonstrate picosecond all-optical switching of the local phase transition in plasmonic antenna-vanadium dioxide(VO_(2))hybrids,exploiting strong resonant field enhancement and selective optical pumping in plasmonic ***-and wavelength-dependent pump–probe spectroscopy of multifrequency crossed antenna arrays shows that nanoscale optical switching in plasmonic hotspots does not affect neighboring antennas placed within 100 nm of the excited *** antenna-assisted pumping mechanism is confirmed by numerical model calculations of the resonant,antenna-mediated local heating on a picosecond time *** hybrid,nanoscale excitation mechanism results in 20 times reduced switching energies and 5 times faster recovery times than a VO_(2) film without antennas,enabling fully reversible switching at over two million cycles per second and at local switching energies in the picojoule *** hybrid solution of antennas and VO_(2) provides a conceptual framework to merge the field localization and phase-transition response,enabling precise,nanoscale optical memory functionalities.

关键词： insulator-metal phase transition nanoantenna plasmonics VO_(2)

Nanooptics of Subnanometric Plasmonic Gaps

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Nanooptics of Subnanometric Plasmonic Gaps

Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit

第十八届全国光散射学术会议

作者： javier aizpurua Center for Materials Physics （CSIC-UPV/EHU） and DIPC Paseo Manuel Lardizabal 5

＜正＞Plasmonic nanogaps are formed at the junction of two metallic interfaces providing a great opportunity to explore atomic-scale morphologies and complex photochemical processes by optical means,thanks to the excitation of intense surface plasmonic modes[1].In recent years,optical spectroscopy of these cavities has

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Light(Science & Applications) 2017年第1期6卷 55-62页

作者： Marta Autore Peining Li Irene Dolado Francisco J Alfaro-Mozaz Ruben Esteban Ainhoa Atxabal Fèlix Casanova Luis E Hueso Pablo Alonso-González javier aizpurua Alexey Y Nikitin Saül Vélez Rainer Hillenbrand CIC nanoGUNE Donostia-San Sebastián 20018Spain Donostia International Physics Center(DIPC) Donostia-San Sebastián 20018Spain IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain Departamento de Física Universidad de OviedoOviedo 33007Spain Centro de Física de Materiales(MPC CSIC-UPV/EHU)Donostia-San Sebastián 20018Spain Current address:Department of Materials ETH ZürichZürich 8093Switzerland CIC nanoGUNE and UPV/EHU Donostia-San Sebastián 20018Spain

Enhanced light-matter interactions are the basis of surface-enhanced infrared absorption(SEIRA)spectroscopy,and conventionally rely on plasmonic materials and their capability to focus light to nanoscale spot *** polariton nanoresonators made of polar crystals could represent an interesting alternative,since they exhibit large quality factors,which go far beyond those of their plasmonic *** recent emergence of van der Waals crystals enables the fabrication of highquality nanophotonic resonators based on phonon polaritons,as reported for the prototypical infrared-phononic material hexagonal boron nitride(h-BN).In this work we use,for the first time,phonon-polariton-resonant h-BN ribbons for SEIRA spectroscopy of small amounts of organic molecules in Fourier transform infrared ***,the interaction between phonon polaritons and molecular vibrations reaches experimentally the onset of the strong coupling regime,while numerical simulations predict that vibrational strong coupling can be fully *** polariton nanoresonators thus could become a viable platform for sensing,local control of chemical reactivity and infrared quantum cavity optics experiments.

关键词： boron nitride phonon polaritons strong coupling surface-enhanced infrared absorption spectroscopy SEIRA

Hybrid photonic-plasmonic cavities based on the nanoparticle-on-a-mirror configuration

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Photonics Research 2021年第12期9卷 2398-2419页

作者： ANGELA I.BARREDA MARIO ZAPATA-HERRERA ISABELLE M.PALSTRA LAURA MERCADÉ javier aizpurua A.FEMIUS KOENDERINK ALEJANDRO MARTÍNEZ Institute of Solid State Physics Friedrich Schiller University Jena07743 JenaGermany Institute of Applied Physics Abbe Center of PhotonicsFriedrich Schiller University Jena07745 JenaGermany Nanophotonics Technology Center Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain Materials Physics Center CSIC-UPV/EHU 20018 Donostia-San SebastianSpain Donostia International Physics Center DIPC 20018 Donostia-San SebastianSpain Center for Nanophotonics AMOLF1098 XG AmsterdamThe Netherlands Van der Waals-Zeeman Institute Institute of PhysicsUniversity of Amsterdam1090 GL AmsterdamThe Netherlands

Hybrid photonic-plasmonic cavities have emerged as a new platform to increase light-matter interaction capable to enhance the Purcell factor in a singular way not attainable with either photonic or plasmonic cavities *** the hybrid cavities proposed so far,the plasmonic element is usually a metallic bow-tie antenna,so the plasmonic gap—defined by lithography-is limited to minimum values of several ***-on-a-mirror(NPoM)cavities are far superior to achieve the smallest possible mode volumes,as plasmonic gaps smaller than 1 nm can be ***,we design a hybrid cavity that combines an NPoM plasmonic cavity and a dielectric-nanobeam photonic crystal cavity operating at transverse-magnetic *** metallic nanoparticle can be placed very close(<1 nm)to the upper surface of the dielectric cavity,which acts as a low-reflectivity *** demonstrate through numerical calculations of the local density of states that this hybrid plasmonic-photonic cavity exhibits quality factors𝑄above 10^(3) and normalized mode volumes𝑉down to 10^(−3),thus resulting in high Purcell factors(F_(P)≈10^(5)),while being experimentally feasible with current *** results suggest that hybrid cavities with sub-nanometer gaps should open new avenues for boosting light-matter interaction in nanophotonic systems.

关键词： mirror cavity nanoparticle

Astrocytes, reactive astrogliosis, and glial scar formation in traumatic brain injury

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Neural Regeneration Research 2025年第4期20卷 973-989页

作者： María Belén Cieri Alberto javier Ramos Laboratorio de Neuropatología Molecular IBCN UBA-CONICETFacultad de MedicinaUniversidad de Buenos AiresBuenos AiresArgentina

Traumatic brain injury is a global health crisis,causing significant death and disability *** that follows traumatic brain injury has serious consequences for neuronal survival and cognitive impairments,with astrocytes involved in this *** traumatic brain injury,astrocytes rapidly become reactive,and astrogliosis propagates from the injury core to distant brain *** astroglial proteins are downregulated near the traumatic brain injury core,while pro-inflammatory astroglial genes are *** altered gene expression is considered a pathological remodeling of astrocytes that produces serious consequences for neuronal survival and cognitive *** addition,glial scar formed by reactive astrocytes is initially necessary to limit immune cell infiltration,but in the long term impedes axonal reconnection and functional *** therapeutic strategies for traumatic brain injury are focused on preventing acute ***,cannabinoids,progesterone,beta-blockers,and cerebrolysin demonstrate neuroprotective benefits but most of them have not been studied in the context of *** this review,we discuss the cell signaling pathways activated in reactive astrocytes following traumatic brain injury and we discuss some of the potential new strategies aimed to modulate astroglial responses in traumatic brain injury,especially using cell-targeted strategies with miRNAs or lncRNA,viral vectors,and repurposed drugs.

关键词： astrocyte glial scar innate immunity neuroinflammation stab injury Toll-like receptors

Beyond neurodegeneration:engineering amyloids for biocatalysis

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Neural Regeneration Research 2025年第10期20卷 2915-2916页

作者： Andrea Bartolomé-Nafría javier García-Pardo Salvador Ventura Institut de Biotecnologia i de Biomedicina(IBB)and Departament de Bioquímica i Biologia Molecular Universitat Autònoma de BarcelonaBellaterraBarcelonaSpain Hospital Universitari Parc Taulí Institut d’Investigaciói InnovacióParc Taulí(I3PT-CERCA)Universitat Autònoma de BarcelonaSabadellSpain

Amyloid fibrils are highly organized protein or peptide aggregates,often characterized by a distinctive supramolecular cross-β-sheet *** formation and accumulation of these structures have been traditionally associated with neural or systemic human diseases,such as Alzheimer’s disease,Parkinson’s disease,type-2 diabetes,or amyotrophic lateral sclerosis(Wei et al.,2017;Wittung-Stafshede,2023).

关键词： structure amyloid

Differential response of injured and healthy retinas to syngeneic and allogeneic transplantation of a clonal cell line of immortalized olfactory ensheathing glia:a double-edged sword

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Neural Regeneration Research 2025年第8期20卷 2395-2407页

作者： María Norte-Muñoz María Portela-Lomba Paloma Sobrado-Calvo Diana Simón Johnny Di Pierdomenico Alejandro Gallego-Ortega Mar Pérez JoséMCabrera-Maqueda javier Sierra Manuel Vidal-Sanz María Teresa Moreno-Flores Marta Agudo-Barriuso Grupo de Investigación Oftalmología Experimental Departamento de OftalmologíaOptometríaOtorrinolaringología y Anatomía PatológicaFacultad de MedicinaUniversidad de MurciaInstituto Murciano de Investigación Biosanitaria(IMIB)Campus de Ciencias de la SaludMurciaSpain Experimental Sciences Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain Anatomy Histology and Neuroscience DepartmentMedicine FacultyUniversidad Autónoma de MadridMadridSpain Center of Neuroimmunology Service of NeurologyLaboratory of Advanced Imaging in Neuroimmunological DiseasesHospital Clínic of BarcelonaInstitut d’Investigacions Biomèdiques August Pi i Sunyer(IDIBAPS)and Universitat de BarcelonaBarcelonaSpain Medicine Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain

Olfactory ensheathing glia promote axonal regeneration in the mammalian central nervous system,including retinal ganglion cell axonal growth through the injured optic ***,it is unknown whether olfactory ensheathing glia also have neuroprotective *** ensheathing glia express brain-derived neurotrophic factor,one of the best neuroprotectants for axotomized retinal ganglion ***,we aimed to investigate the neuroprotective capacity of olfactory ensheating glia after optic nerve *** ensheathing glia cells from an established rat immortalized clonal cell line,TEG3,were intravitreally injected in intact and axotomized retinas in syngeneic and allogeneic mode with or without microglial inhibition or immunosuppressive *** and gene expression analyses were *** bulb-derived primary olfactory ensheathing glia and TEG3 express major histocompatibility complex classⅡ*** and syngenically transplanted TEG3 cells survived in the vitreous for up to 21 days,forming an *** axotomized retinas,only the allogeneic TEG3 transplant rescued retinal ganglion cells at 7 days but not at 21 *** these retinas,microglial anatomical activation was higher than after optic nerve crush *** intact retinas,both transplants activated microglial cells and caused retinal ganglion cell death at 21 days,a loss that was higher after allotransplantation,triggered by pyroptosis and partially rescued by microglial inhibition or ***,neuroprotection of axotomized retinal ganglion cells did not improve with these *** different neuroprotective properties,different toxic effects,and different responses to microglial inhibitory treatments of olfactory ensheathing glia in the retina depending on the type of transplant highlight the importance of thorough preclinical studies to explore these variables.

关键词： cell therapy immune recognition major histocompatibility complex class II(MHCII) neuroprotection olfactory ensheathing glia retinal ganglion cells

Nanoparticles embedded into glass matrices:glass nanocomposites

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Frontiers of Materials Science 2022年第3期16卷 1-81页

作者： javier FONSECA Department of Chemical Engineering Northeastern UniversityBoston 02115USA

Research on glass nanocomposites(GNCs)has been very active in the past *** have attracted—and still do—great interest in the fields of optoelectronics,photonics,sensing,electrochemistry,catalysis,biomedicine,and *** this review,the potential applications of GNCs in these fields are briefly described to show the reader the possibilities of these *** most important synthesis methods of GNCs(melt-quenching,sol-gel,ion implantation,ion-exchange,staining process,spark plasma sintering,radio frequency sputtering,spray pyrolysis,and chemical vapor deposition techniques)are extensively *** major aim of this review is to systematize our knowledge about the synthesis of GNCs and to explore the mechanisms of formation and growth of NPs within glass *** size-controlled preparation of NPs within glass matrices,which remains a challenge,is essential for advanced ***,a thorough understanding of GNC synthesis techniques is expected to facilitate the preparation of innovative GNCs.

关键词： glass nanocomposites melt-quenching sol-gel ion implantation ion-exchange