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| 1 | Metasurface-based multi-harmonic freeelectron light source显示文摘Metasurfaces are subwavelength spatial variations in geometry and material where the structures are of negligible thickness compared to the wavelength of light and are optimized for far-field applications,such as controlling the wavefronts of electromagnetic waves.Here,we investigate the potential of the metasurface near-field profile,generated by an incident few-cycle pulse laser,to facilitate the generation of high-frequency light from free electrons.In particular,the metasurface near-field contains higher-order spatial harmonics that can be leveraged to generate multiple higher-harmonic X-ray frequency peaks.We show that the X-ray spectral profile can be arbitrarily shaped by controlling the metasurface geometry,the electron energy,and the incidence angle of the laser input.Using ab initio simulations,we predict bright and monoenergetic X-rays,achieving energies of 30 keV(with harmonics spaced by 3 keV)from 5-MeV electrons using 3.4-eV plasmon polaritons on a metasurface with a period of 85 nm.As an example,we present the design of a four-color X-ray source,a potential candidate for tabletop multicolor hard X-ray spectroscopy.Our developments could help pave the way for compact multi-harmonic sources of high-energy photons,which have potential applications in industry,medicine,and the fundamental sciences. | Gilles Rosolen Liang Jie Wong Nicholas Rivera Bjorn Maes Marin Soljačić Ido Kaminer | 2018 | Light(Science & Applications)2018，7，1： | 2 |
| 2 | Creating heralded hyper-entangled photons using Rydberg atoms显示文摘Entangled photon pairs are a fundamental component for testing the foundations of quantum mechanics,and for modern quantum technologies such as teleportation and secured communication.Current state-of-the-art sources are based on nonlinear processes that are limited in their efficiency and wavelength tunability.This motivates the exploration of physical mechanisms for entangled photon generation,with a special interest in mechanisms that can be heralded,preferably at telecommunications wavelengths.Here we present a mechanism for the generation of heralded entangled photons from Rydberg atom cavity quantum electrodynamics(cavity QED).We propose a scheme to demonstrate the mechanism and quantify its expected performance.The heralding of the process enables non-destructive detection of the photon pairs.The entangled photons are produced by exciting a rubidium atom to a Rydberg state,from where the atom decays via two-photon emission(TPE).A Rydberg blockade helps to excite a single Rydberg excitation while the input light field is more efficiently collectively absorbed by all the atoms.The TPE rate is significantly enhanced by a designed photonic cavity,whose many resonances also translate into high-dimensional entanglement.The resulting high-dimensionally entangled photons are entangled in more than one degree of freedom:in all of their spectral components,in addition to the polarization—forming a hyperentangled state,which is particularly interesting in high information capacity quantum communication.We characterize the photon comb states by analyzing the Hong-Ou-Mandel interference and propose proof-of-concept experiments. | Sutapa Ghosh Nicholas Rivera Gadi Eisenstein Ido Kaminer | 2021 | Light(Science & Applications)2021，10，7： | 0 |
| 3 | Breakdown of effective-medium theory by a photonic spin Hall effect显示文摘Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective medium.The effective-medium theory is fundamental to various realms,including electromagnetics and material science,since it can largely decrease the complexity in the exploration of light-matter interactions by providing simple acceptable approximation.Generally,the effective-medium theory is thought to be applicable to any all-dielectric system with deep-subwavelength constituents,under the condition that the effective medium does not have a critical angle,at which the total internal reflection occurs.Here we reveal a fundamental breakdown of the effective-medium theory that can be applied in very general conditions:showing it for deep-subwavelength all-dielectric multilayers even without a critical angle.Our finding relies on an exotic photonic spin Hall effect,which is shown to be ultrasensitive to the stacking order of deep-subwavelength dielectric layers,since the spin-orbit interaction of light is dependent on slight phase accumulations during the wave propagation.Our results indicate that the photonic spin Hall effect could provide a promising and powerful tool for measuring structural defects for all-dielectric systems even in the extreme nanometer scale. | Shuaijie Yuan Xinxing Zhou Yu Chen Yuhan Zhong Lijuan Sheng Hao Hu Hongsheng Chen Ido Kaminer Xiao Lin | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，11： | 0 |
| 4 | Superscattering of water waves显示文摘Inspired by the concept of superscattering in optics,we for the first time theoretically predict and experimentally demonstrate the superscattering phenomenon in water waves.The subwavelength superscatterer is constructed by multi-layered concentric cylinders with an inhomogeneous depth profile.The superscatterer breaks the long-held single-channel scattering limit by several times and thus significantly enhances the total scattering strength.The underlying mechanism originates from the near degeneracy of the resonances of multiple channels.We fabricate the superscatterer prototype and experimentally measure the near-field patterns,which are consistent with theoretical prediction and numerical simulation.Our study opens a new avenue to strengthen water-wave scattering and deepen the understanding in water waves,which can be useful for ocean energy harvesting and harbor protection. | Zijian Qin Chao Qian Lian Shen Xiaoping Wang Ido Kaminer Hongsheng Chen Huaping Wang | 2023 | National Science Review2023，10，7： | 0 |
| 5 | Weak measurements and quantum-to-classical transitions in free electron-photon interactions显示文摘How does the quantum-to-classical transition of measurement occur?This question is vital for both foundations and applications of quantum mechanics.Here,we develop a new measurement-based framework for characterizing the classical and quantum free electron-photon interactions and then experimentally test it.We first analyze the transition from projective to weak measurement in generic light-matter interactions and show that any classical electron-laserbeam interaction can be represented as an outcome of weak measurement.In particular,the appearance of classical point-particle acceleration is an example of an amplified weak value resulting from weak measurement.A universal factor,exp(-Γ^(2)=2),quantifies the measurement regimes and their transition from quantum to classical,whereΓcorresponds to the ratio between the electron wavepacket size and the optical wavelength.This measurement-based formulation is experimentally verified in both limits of photon-induced near-field electron microscopy and the classical acceleration regime using a DLA.Our results shed new light on the transition from quantum to classical electrodynamics,enabling us to employ the essence of the wave-particle duality of both light and electrons in quantum measurement for exploring and applying many quantum and classical light-matter interactions. | Yiming Pan Eliahu Cohen Ebrahim Karimi Avraham Gover Norbert Schönenberger TomášChlouba Kangpeng Wang Saar Nehemia Peter Hommelhoff Ido Kaminer Yakir Aharonov | 2023 | Light(Science & Applications)2023，12，11： | 0 |
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