检索结果-南通市图书馆

Thermodynamic limits for simultaneous energy harvesting from the hot sun and cold outer space

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 1373-1383页

作者： Wei Li Siddharth Buddhiraju Shanhui Fan Department of Electrical Engineering Ginzton LaboratoryStanford UniversityStanfordCA 94305USA

The sun and outer space are two of the most important fundamental thermodynamic resources for renewable energy harvesting.A significant amount of work has focused on understanding the fundamental limit of energy harvesting from the *** recently,there have been several theoretical analyses of the fundamental limit of energy harvesting from outer ***,far less is understood about the fundamental limits of simultaneous energy harvesting from both the sun and outer ***,we consider and introduce various schemes that are capable of simultaneous energy harvesting and elucidate the fundamental thermodynamic limits of these *** show that the theoretical limits can far exceed the previously established limit associated with utilizing only one thermodynamic *** results highlight the significant potential of simultaneous energy harvesting and indicate new fundamental opportunities for improving the efficiency of energy harvesting systems.

关键词： outer harvesting simultaneous

Higher-order topological insulators in synthetic dimensions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 831-839页

作者： Avik Dutt Momchil Minkov Ian A.D.Williamson Shanhui Fan ginzton laboratory and Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA

Conventional topological insulators support boundary states with dimension one lower than that of the bulk system that hosts them,and these states are topologically protected due to quantized bulk dipole ***,higherorder topological insulators have been proposed as a way of realizing topological states with dimensions two or more lower than that of the bulk due to the quantization of bulk quadrupole or octupole ***,all these proposals as well as experimental realizations have been restricted to real-space ***,we construct photonic higher-order topological insulators(PHOTIs)in synthetic *** show the emergence of a quadrupole PHOTI supporting topologically protected corner modes in an array of modulated photonic molecules with a synthetic frequency dimension,where each photonic molecule comprises two coupled *** changing the phase difference of the modulation between adjacent coupled photonic molecules,we predict a dynamical topological phase transition in the ***,we show that the concept of synthetic dimensions can be exploited to realize even higher-order multipole moments such as a fourth-order hexadecapole(16-pole)insulator supporting 0D corner modes in a 4D hypercubic synthetic lattice that cannot be realized in real-space lattices.

关键词： topological dimensions insulator

Metamaterials for radiative sky cooling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2018年第2期5卷 132-133页

作者： Shanhui Fan Aaswath Raman ginzton laboratory Department of Electrical Engineering Stanford University Department of Electrical and Systems Engineering University of Pennsylvania

From fundamental thermodynamic considerations,in order to convert heat to usable work,it is important to have a heat source with a temperature that is as high as possible,and to have a heat sink with a temperature that is as low as *** vast majority of energy conversion processes at the moment use our ambient surroundings on Earth itself,with a

关键词： METAMATERIALS THERMODYNAMICS

Measuring,processing,and generating partially coherent light with self-configuring optics

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第11期13卷 2726-2733页

作者： Charles Roques-Carmes Shanhui Fan David A.B.Miller 1E.L.ginzton laboratory Stanford University348 Via PuebloStanfordCA 94305USA

Optical phenomena always display some degree of partial coherence between their respective degrees of *** coherence is of particular interest in multimodal systems,where classical and quantum correlations between spatial,polarization,and spectral degrees of freedom can lead to fascinating phenomena(e.g.,entanglement)and be leveraged for advanced imaging and sensing modalities(e.g.,in hyperspectral,polarization,and ghost imaging).Here,we present a universal method to analyze,process,and generate spatially partially coherent light in multimode systems by using self-configuring optical *** method relies on cascaded self-configuring layers whose average power outputs are sequentially *** optimized,the network separates the input light into its mutually incoherent components,which is formally equivalent to a diagonalization of the input density *** illustrate our method with numerical simulations of Mach-Zehnder interferometer arrays and show how this method can be used to perform partially coherent environmental light sensing,generation of multimode partially coherent light with arbitrary coherency matrices,and unscrambling of quantum optical *** provide guidelines for the experimental realization of this method,including the influence of losses,paving the way for self-configuring photonic devices that can automatically learn optimal modal representations of partially coherent light fields.

关键词： coherent modal generating

Inverse-designed silicon carbide quantum and nonlinear photonics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第9期12卷 1886-1892页

作者： Joshua Yang Melissa A.Guidry Daniil M.Lukin Kiyoul Yang Jelena Vučković E.L.ginzton laboratory Stanford UniversityStanfordCAUSA John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMAUSA

Inverse design has revolutionized the field of photonics,enabling automated development of complex structures and geometries with unique functionalities unmatched by classical ***,the use of inverse design in nonlinear photonics has been *** this work,we demonstrate quantum and classical nonlinear light generation in silicon carbide nanophotonic inverse-designed Fabry-Pérot *** achieve ultra-low reflector losses while targeting a pre-specified anomalous dispersion to reach optical parametric *** controlling dispersion through inverse design,we target a second-order phase-matching condition to realize second-and third-order nonlinear light generation in our devices,thereby extending stimulated parametric processes into the visible *** first realization of computational optimization for nonlinear light generation highlights the power of inverse design for nonlinear optics,in particular when combined with highly nonlinear materials such as silicon carbide.

关键词： spectrum. nonlinear inverse

Unscrambling light-automatically undoing strong mixing between modes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2017年第1期6卷 342-351页

作者： Andrea Annoni Emanuele Guglielmi Marco Carminati Giorgio Ferrari Marco Sampietro David AB Miller Andrea Melloni Francesco Morichetti Dipartimento di Elettronica Informazione e BioingegneriaPolitecnico di MilanoMilano 20133Italy ginzton laboratory Stanford UniversitySpilker BuildingStanfordCA 94305USA

Propagation of light beams through scattering or multimode systems may lead to the randomization of the spatial coherence of the *** information is not lost,its recovery requires a coherent interferometric reconstruction of the original signals,which have been scrambled into the modes of the scattering *** we show that we can automatically unscramble optical beams that have been arbitrarily mixed in a multimode waveguide,undoing the scattering and mixing between the spatial modes through a mesh of silicon photonics tuneable beam *** light detectors integrated in a photonic chip are used to directly monitor the evolution of each mode along the mesh,allowing sequential tuning and adaptive individual feedback control of each beam *** entire mesh self-configures automatically through a progressive tuning algorithm and resets itself after significantly perturbing the mixing,without turning off the *** demonstrate information recovery by the simultaneous unscrambling,sorting and tracking of four mixed modes,with residual cross-talk of−20 dB between the *** partitioning assisted by transparent detectors enables scalability to meshes with a higher port count and to a higher number of modes without a proportionate increase in the control *** principle of self-configuring and self-resetting in optical systems should be applicable in a wide range of optical applications.

关键词： optical processing photonic integrated circuits silicon photonics tuneable photonic devices

Multi-dimensional band structure spectroscopy in the synthetic frequency dimension

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第7期12卷 1425-1433页

作者： Dali Cheng Eran Lustig Kai Wang Shanhui Fan ginzton laboratory and Department of Electrical Engineering Stanford UniversityStanfordCA94305USA Department of Physics McGll UniversityMontrealQC H3A 2T8Canada

The concept of synthetic dimensions in photonics provides a versatile platform in exploring multi-dimensional *** of these physics are characterized by band structures in more than one *** efforts on band structure measurements in the photonic synthetic frequency dimension however are limited to either onedimensional Brillouin zones or one-dimensional subsets of multi-dimensional Billouin *** we theoretically propose and experimentally demonstrate a method to fully measure multi-dimensional band structures in the synthetic frequency *** use a single photonic resonator under dynamical modulation to create a multidimensional synthetic frequency *** show that the band structure of such a lattice over the entire multidimensional Brillouin zone can be measured by introducing a gauge potential into the lattice *** this method,we perform experimental measurements of two-dimensional band structures of a Hermitian and a non-Hermitian *** measurements reveal some of the general properties of point-gap topology of the non-Hermitian Hamiltonian in more than one *** results demonstrate experimental capabilities to fully characterize high-dimensional physical phenomena in the photonic synthetic frequency dimension.

关键词： resonator synthetic dimensional

Design of a multichannel photonic crystal dielectric laser accelerator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2020年第10期8卷 1586-1598页

作者： ZHEXIN ZHAO DYLAN S.BLACK R.JOEL ENGLAND TYLER W.HUGHES YU MIAO DOLAV SOLGAARD ROBERT L.BYER SHANHUI FAN ginzton laboratory Stanford UniversityStanfordCaliforma 94305USA SLAC National Accelerator laboratory Menlo ParkCalifornia 94025USA

To be useful for most scientific and medical applications,compact particle accelerators will require much higher average current than enabled by current *** this purpose,we propose a photonic crystal architecture for a dielectric laser accelerator,referred to as a multi-input multi-output silicon accelerator(MIMOSA),that enables simultancous acceleration of multiple electron beams,increasing the total electron throughput by at least I order of *** achieve this,we show that the photonic crystal must support a mode at the I point in reciprocal space,with a normalized frequency equal to the normalized speed of the phase-matched *** show that the figure of merit of the MIMOSA can be inferred from the eigenmodes of the corresponding infinitely periodic structure,which provides a powerful approach to design such ***,we extend the MIMOSA architecture to electron deflectors and other clectron manipulation *** additional functionalities,combined with the increased electron throughput of these devices,permit all-optical on-chip manipulation of electron beams in a fully integrated architecture compatible with current fabrication technologies,which opens the way to unconventional electron beam shaping,imaging,and radiationg encration.

关键词： dielectric crystal normalized

Self-configuring universal linear optical component[Invited]

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2013年第1期1卷 1-15页

作者： David A.B.Miller ginzton laboratory Stanford University348 Via Pueblo MallStanfordCalifornia 94305-4088USA

We show how to design an optical device that can perform any linear function or coupling between inputs and *** design method is progressive,requiring no global *** also show how the device can configure itself progressively,avoiding design calculations and allowing the device to stabilize itself against drifts in component properties and to continually adjust itself to changing *** self-configuration operates by training with the desired pairs of orthogonal input and output functions,using sets of detectors and local feedback loops to set individual optical elements within the device,with no global feedback or multiparameter optimization *** mappings,such as spatial mode conversions and polarization control,can be implemented using standard planar integrated *** the spirit of a universal machine,we show that other linear operations,including frequency and time mappings,as well as nonreciprocal operation,are possible in principle,even if very challenging in practice,thus proving there is at least one constructive design for any conceivable linear optical component;such a universal device can also be *** approach is general for linear waves,and could be applied to microwaves,acoustics,and quantum mechanical superpositions.

关键词： acoustics operations optics