A5085416698- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Metamaterials and Metasurfaces Applications
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Plasmonic and Surface Plasmon Research
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- Photonic Crystals and Applications
- Luminescence and Fluorescent Materials
- X-ray Spectroscopy and Fluorescence Analysis
- Astronomical Observations and Instrumentation
- Gold and Silver Nanoparticles Synthesis and Applications
- Liquid Crystal Research Advancements
- Inorganic Fluorides and Related Compounds
- Synthesis and Properties of Aromatic Compounds
- Ga2O3 and related materials
- Gamma-ray bursts and supernovae
- Advanced Antenna and Metasurface Technologies
Kunming Medical University
2025
First Affiliated Hospital of Kunming Medical University
2025
Institute of High Energy Physics
2013-2024
Chinese Academy of Sciences
1998-2024
University of Chinese Academy of Sciences
2022-2024
Southern University of Science and Technology
2018-2022
Harbin Institute of Technology
2018-2022
South China University of Technology
2014-2016
State Key Laboratory of Luminescent Materials and Devices
2016
Chinese Academy of Social Sciences
2002-2013
DAMA/LIBRA is running at the Gran Sasso National Laboratory of I.N.F.N. Here results obtained with a further exposure 0.34 ton × yr are presented. They refer to two annual cycles collected one before and after first upgrade occurred on September/October 2008. The cumulative those previously released by former DAMA/NaI now 1.17 yr, corresponding 13 cycles. data confirm previous positive investigating presence Dark Matter (DM) particles in galactic halo means model independent modulation...
The results obtained with the total exposure of 1.04 ton x yr collected by DAMA/LIBRA-phase1 deep underground at Gran Sasso National Laboratory (LNGS) I.N.F.N. during 7 annual cycles (i.e. adding a further 0.17 exposure) are presented. data give evidence for presence Dark Matter (DM) particles in galactic halo, on basis exploited model independent DM modulation signature using highly radio-pure NaI(Tl) target, 7.5 sigma C.L.. Including also first generation DAMA/NaI experiment (cumulative...
The first model independent results obtained by the DAMA/LIBRA-phase2 experiment are presented.The data have been collected over 6 annual cycles corresponding to a total exposure of 1.13 t yr, deep underground at Gran Sasso National Laboratory (LNGS) I.N.F.N.The apparatus, ≃ 250 kg highly radio-pure NaI(Tl), profits from second generation high quantum efficiency photomultipliers and new electronics with respect DAMA/LIBRA-phase1.The improved experimental configuration has also allowed...
The first results obtained by the DAMA/LIBRA–phase2 experiment are presented. data have been collected over six independent annual cycles corresponding to a total exposure of 1.13 ton × year, deep underground at Gran Sasso National Laboratory. apparatus, about 250 kg highly radio-pure NaI(Tl), profits from second generation high quantum efficiency photomultipliers and new electronics with respect DAMA/LIBRA–phase1. improved experimental configuration has also allowed lower software energy...
New dedicated high quantum efficiency (Q.E.) photomultipliers (PMTs) have been produced by HAMAMATSU company, tested, selected and installed in the DAMA/LIBRA set-up at Gran Sasso National Laboratory (LNGS) of I.N.F.N.. In this paper results obtained measurements various features these Q.E. PMTs are reported, some performances new configuration shown.
Metasurface-based structural coloration is a promising enabling technology for advanced optical encryption with high-security level. Herein, we propose paradigm of electrically switchable, polarization-sensitive based on designed metasurfaces integrated polymer-dispersed liquid crystals. The consist anisotropic and isotropic aluminum nanoaperture arrays. Optical images can be encrypted by elaborately arranging nanoapertures their polarization-dependent plasmonic resonance characteristics. We...
The effect pointed out by A. B. Migdal in 1940's (hereafter named effect) has so far been usually neglected the direct searches for WIMP Dark Matter candidates. This consists ionization and excitation of bound atomic electrons induced recoiling nucleus. In present paper related theoretical arguments are developed some consequences proper accounting this discussed examples practical interest.
Some extensions of the standard model provide dark matter candidate particles which can have a dominant coupling with lepton sector ordinary matter. Thus, such (${\ensuremath{\chi}}^{0}$) be directly detected only through their interaction electrons in detectors suitable experiment, while they are lost by experiments based on rejection electromagnetic component experimental counting rate. These candidates also offer possible source 511 keV photons observed from galactic bulge. In this paper...
In this paper a new search for non-Paulian nuclear processes, i.e. processes normally forbidden by the Pauli Exclusion Principle (PEP), is presented. It has been carried out at Gran Sasso National Laboratory of INFN means highly radiopure DAMA/LIBRA set-up (sensitive mass about 250 kg NaI(Tl)). particular, improved upper limit spontaneous emission rate protons with energy E p ≥ 10 MeV in 23Na and 127I obtained: 1.63 × 10−33 s−1 (90% C.L.). The corresponding on relative strength (δ 2)...
Abstract Optical metasurfaces are 2D flat elements that consist of spatially arranged meta‐atoms. By carefully designing the metasurface, it is possible to fully control properties light in amplitude, phase, and/or polarization. When merged with liquid crystals (LCs), a metasurface can act as reconfigurable optical component enabling dynamical light. However, many reports ignore influence meta‐atom's geometry on orientation LCs. Here, proposed synergistically merge LCs and specially designed...
Chiral metasurfaces can exhibit a strong circular dichroism, but it is limited by the complicated fabrication procedure and alignment errors. Here, new type of self-aligned suspended chiral bilayer metasurface with only one-step electron beam lithography exposure demonstrated. A significant optical chirality 221° µm-1 be realized using thickness 100 nm. Furthermore, this study experimentally demonstrates that such structure capable label-free discrimination molecules at zeptomole level,...
Multi-color and white light emissions are detected in various Zn<sub>2</sub>GeO<sub>4</sub>:<italic>x</italic>Eu nanostructures, based on the competition between emission from Zn<sub>2</sub>GeO<sub>4</sub> host Eu<sup>3+</sup> ions, which show a potential application for emitting diodes.
Abstract The dissymmetry factor (| g lum |) in circularly polarized luminescence (CPL) shows great significance many potential applications. development of upconversion (UC‐CPL) with a large is still limited by structural defects, especially self‐assembly system. Here, self‐organized cholesteric liquid crystals (CLCs) composite demonstrated, induced uniaxially aligned nanorods (UCNRs) film, overcoming the aggregation issue via direct doping. well‐aligned UCNR film serves as emitter, and...
Chirality induction, transfer, and manipulation have aroused great interest in achiral nanomaterials. Here, we demonstrate strong upconverted circularly polarized luminescence from core-shell upconversion nanoparticles (UCNPs) via a plasmonic chiral metasurface-induced optical chirality transfer. The Yb3+-sensitized UCNPs with good dispersity exhibit intense of Tm3+ Nd3+ through the energy transfer process. By spin-coating on this metasurface, enhancement circular polarization modulation can...
New lifetime limits on the charge non-conserving (CNC) electron capture with excitation of 417.9 keV nuclear level in 127I are established by using coincidence technique. The analysed exposure is 0.87 ton × yr, collected deep underground at Gran Sasso National Laboratory INFN highly radiopure DAMA/LIBRA setup (≈250 kg NaI(Tl)). new limit mean life τ>1.2×1024 yr (90 % C.L.), about one order magnitude larger than those previously available for CNC involving excitations and same achieved...
Broadband near-infrared emission and ferromagnetic properties were detected in single phase Ni<sup>2+</sup>-doped β-Ga<sub>2</sub>O<sub>3</sub> nanocrystals, which is meaningful for its application high-accuracy communications, bio-labels, <italic>etc.</italic>
Lanthanide-doped particles exhibit unique polarization-dependent luminescence due to the anisotropic crystalline local symmetry surrounding emitter. Precise control of orientation shows great significance for exploiting luminescent polarization and their potential applications. Here, we demonstrated a facile polypropylene-aided shear-driven method obtain large-scale orientationally ordered upconversion nanorods, showing liquid-crystalline nematic phase. Upconversion nanorods with low aspect...
Magnetic confinement of f electrons wave functions and magnetic field assistant cross relaxation mechanism was firstly built for optical variation.
The morphology of hexagonal phase NaYF4:Er(3+) nanorods synthesized by hydrothermal method changed greatly after a continuing calcination, along with transformation to cubic phase. Photoluminescence (PL) spectra indicated that mid-infrared (MIR) emission was obtained in both and nanocrystals for the first time. And MIR enhanced remarkably at higher calcination temperature. To prevent uncontrollable from transformation, nanospheres an average size ~100 nm were prepared via co-precipitation...
We propose a liquid-crystal-based reconfigurable chiral metasurface absorber and numerically investigate its chiro-optical properties. The consists of metal-insulator-metal structure with the substrate, which can strongly absorb circularly polarized wave one spin state reflects that opposite spin, resulting strong circular dichroism (CD). A birefringent liquid crystal (LC) is exploited to serve as insulator layer in structure. could then vary incident light by controlling alignment LC...