相关参考文献
注意:仅列出部分参考文献,下载原文获取全部文献信息。Plasmon-induced dual-wavelength operation in a Yb3+ laser
Laura Sanchez-Garcia et al.
LIGHT-SCIENCE & APPLICATIONS (2019)
Applications of nanolasers
Ren-Min Ma et al.
NATURE NANOTECHNOLOGY (2019)
Multiline Operation from a Single Plasmon-Assisted Laser
D. Hernandez-Pinilla et al.
ACS PHOTONICS (2018)
Photoinduced Metallic Particle Growth on Single-Crystal Relaxor Ferroelectric Strontium Barium Niobate
Eftihia Barnes et al.
JOURNAL OF PHYSICAL CHEMISTRY C (2018)
Ultracompact Pseudowedge Plasmonic Lasers and Laser Arrays
Yu-Hsun Chou et al.
NANO LETTERS (2018)
Surface-screening mechanisms in ferroelectric thin films and their effect on polarization dynamics and domain structures
Sergei V. Kalinin et al.
REPORTS ON PROGRESS IN PHYSICS (2018)
One-Dimensional Plasmonic Nanoparticle Chain Lasers
Heikki T. Rekola et al.
ACS PHOTONICS (2018)
Field enhancement and spectral features of hexagonal necklaces of silver nanoparticles for enhanced nonlinear optical processes
Alejandro Gomez-Tornero et al.
OPTICS EXPRESS (2018)
Structural Engineering in Plasmon Nanolasers
Danqing Wang et al.
CHEMICAL REVIEWS (2018)
Concentrated second-harmonic generation from a single Al-covered ZnS nanobelt
Hongbo Hu et al.
LASER & PHOTONICS REVIEWS (2017)
Plasmonic enhancement and polarization dependence of nonlinear upconversion emissions from single gold nanorod@SiO2@CaF2:Yb3+,Er3+ hybrid core-shell-satellite nanostructures
Jijun He et al.
LIGHT-SCIENCE & APPLICATIONS (2017)
Plasmonic circuits for manipulating optical information
Timothy J. Davis et al.
NANOPHOTONICS (2017)
Enhanced Second-Harmonic Generation from Sequential Capillarity-Assisted Particle Assembly of Hybrid Nanodimers
Flavia Timpu et al.
NANO LETTERS (2017)
Anisotropic enhancement of Yb3+ luminescence by disordered plasmonic networks self-assembled on RbTiOPO4 ferroelectric crystals
L. Sanchez-Garcia et al.
NANOSCALE (2017)
Band-edge engineering for controlled multi-modal nanolasing in plasmonic superlattices
Danqing Wang et al.
NATURE NANOTECHNOLOGY (2017)
Plasmon assisted enhanced second-harmonic generation in single hybrid Au/ZnS nanowires
Nadia M. Jassim et al.
OPTICAL MATERIALS (2017)
Plasmon enhanced energy-transfer up-conversion in Yb3+-Er3+ co-doped LiNbO3 crystal
D. Hernandez-Pinilla et al.
OPTICAL MATERIALS (2017)
Boosting the down-shifting luminescence of rare-earth nanocrystals for biological imaging beyond 1500 nm
Yeteng Zhong et al.
NATURE COMMUNICATIONS (2017)
High-Yield Plasmonic Nanolasers with Superior Stability for Sensing in Aqueous Solution
Suo Wang et al.
ACS PHOTONICS (2017)
Enhanced Second Harmonic Generation by Mode Matching in Gain-assisted Double-plasmonic Resonance Nanostructure
Gui-Ming Pan et al.
SCIENTIFIC REPORTS (2017)
Plasmon-Induced Selective Enhancement of Green Emission in Lanthanide-Doped Nanoparticles
Weina Zhang et al.
ACS APPLIED MATERIALS & INTERFACES (2017)
Universal analytical modeling of plasmonic nanoparticles
Renwen Yu et al.
CHEMICAL SOCIETY REVIEWS (2017)
Plasmon-enhanced fluorescence spectroscopy
Jian-Feng Li et al.
CHEMICAL SOCIETY REVIEWS (2017)
2D Arrays of Hexagonal Plasmonic Necklaces for Enhanced Second Harmonic Generation
Alejandro Gomez-Tornero et al.
ADVANCED MATERIALS (2017)
Polarization-Independent Multiple Fano Resonances in Plasmonic Nonamers for Multimode-Matching Enhanced Multiband Second-Harmonic Generation
Shao-Ding Liu et al.
ACS NANO (2016)
Laser Refrigeration of Ytterbium-Doped Sodium-Yttrium-Fluoride Nanowires
Xuezhe Zhou et al.
ADVANCED MATERIALS (2016)
A Plasmonic Platform with Disordered Array of Metal Nanoparticles for Three-Order Enhanced Upconversion Luminescence and Highly Sensitive Near-Infrared Photodetector
Seok Joon Kwon et al.
ADVANCED MATERIALS (2016)
Influence of annealing on the photodeposition of silver on periodically poled lithium niobate
N. Craig Carville et al.
JOURNAL OF APPLIED PHYSICS (2016)
Polarization-selective enhancement of Nd3+ photoluminescence assisted by linear chains of silver nanoparticles
E. Yraola et al.
JOURNAL OF LUMINESCENCE (2016)
Optimizing SERS from Gold Nanoparticle Clusters: Addressing the Near Field by an Embedded Chain Plasmon Model
Richard W. Taylor et al.
JOURNAL OF PHYSICAL CHEMISTRY C (2016)
Linear and Polygonal Assemblies of Plasmonic Nanoparticles: Incident Light Polarization Dictates Hot Spots
Reshmi Thomas et al.
JOURNAL OF PHYSICAL CHEMISTRY C (2016)
Plasmon-Assisted Nd3+-Based Solid-State Nanolaser
Pablo Molina et al.
NANO LETTERS (2016)
Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO4 crystals by aggregates of silver nanostructures
Laura Sanchez-Garcia et al.
OPTICS EXPRESS (2016)
Semiconductor plasmonic nanolasers: current status and perspectives
Shangjr Gwo et al.
REPORTS ON PROGRESS IN PHYSICS (2016)
Plasmon-photon conversion to near-infrared emission from Yb3+: (Au/Ag-nanoparticles) in tungsten-tellurite glasses
V. A. G. Rivera et al.
SCIENTIFIC REPORTS (2016)
Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas
Heiko Linnenbank et al.
LIGHT-SCIENCE & APPLICATIONS (2016)
Ultrafast Nonlinear Plasmonic Spectroscopy: From Dipole Nanoantennas to Complex Hybrid Plasmonic Structures
Bernd Metzger et al.
ACS PHOTONICS (2016)
Biocompatible Gold Nanoparticle Arrays Photodeposited on Periodically Proton Exchanged Lithium Niobate
N. Craig Carville et al.
ACS BIOMATERIALS SCIENCE & ENGINEERING (2016)
Biocompatible Gold Nanoparticle Arrays Photodeposited on Periodically Proton Exchanged Lithium Niobate
N. Craig Carville et al.
ACS BIOMATERIALS SCIENCE & ENGINEERING (2016)
Optical Second Harmonic Generation in Plasmonic Nanostructures: From Fundamental Principles to Advanced Applications
Jeremy Butet et al.
ACS NANO (2015)
Plasmon enhancement of luminescence upconversion
Wounjhang Park et al.
CHEMICAL SOCIETY REVIEWS (2015)
Energy transfer in lanthanide upconversion studies for extended optical applications
Hao Dong et al.
CHEMICAL SOCIETY REVIEWS (2015)
Second-Harmonic Generation from Sub-5 nm Gaps by Directed Self-Assembly of Nanoparticles onto Template-Stripped Gold Substrates
Zhaogang Dong et al.
NANO LETTERS (2015)
Enhancing Second Harmonic Generation in Gold Nanoring Resonators Filled with Lithium Niobate
Dennis Lehr et al.
NANO LETTERS (2015)
Strong Enhancement of Second Harmonic Emission by Plasmonic Resonances at the Second Harmonic Wavelength
Bernd Metzger et al.
NANO LETTERS (2015)
Mode matching in multiresonant plasmonic nanoantennas for enhanced second harmonic generation
Michele Celebrano et al.
NATURE NANOTECHNOLOGY (2015)
Controlling upconversion nanocrystals for emerging applications
Bo Zhou et al.
NATURE NANOTECHNOLOGY (2015)
Controlling solid state gain media by deposition of silver nanoparticles: from thermally-quenched to plasmon-enhanced Nd3+ luminescence
Eduardo Yraola et al.
OPTICS EXPRESS (2015)
Nanoplasmonic sensing and detection
Mark I. Stockman
SCIENCE (2015)
Nanoplasmonic waveguides: towards applications in integrated nanophotonic circuits
Yurui Fang et al.
LIGHT-SCIENCE & APPLICATIONS (2015)
Giant Enhancement of Upconversion Fluorescence of NaYF4:Yb3+,Tm3+ Nanocrystals with Resonant Waveguide Grating Substrate
Jian Hung Lin et al.
ACS PHOTONICS (2015)
Probing Extended Modes on Disordered Plasmonic Networks by Wavefront Shaping
Pierre Bondareff et al.
ACS PHOTONICS (2015)
Second-Harmonic Generation from Metal Nanoparticles: Resonance Enhancement versus Particle Geometry
Robert Czaplicki et al.
NANO LETTERS (2015)
Distance-Dependent Plasmon-Enhanced Fluorescence of Upconversion Nanoparticles using Polyelectrolyte Multilayers as Tunable Spacers
Ai Ling Feng et al.
SCIENTIFIC REPORTS (2015)
Multifunctional Rare-Earth Vanadate Nanoparticles: Luminescent Labels, Oxidant Sensors, and MRI Contrast Agents
Mouna Abdesselem et al.
ACS NANO (2014)
Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF4: Yb3+,Er3+ Nanoparticles: Maxwell versus Forster
Dawei Lu et al.
ACS NANO (2014)
BaMgF 4: An Ultra- Transparent Two- Dimensional Nonlinear Photonic Crystal with Strong. (3) Response in the UV Spectral Region
Luis Mateos et al.
ADVANCED FUNCTIONAL MATERIALS (2014)
Blue SHG Enhancement by Silver Nanocubes Photochemically Prepared on a RbTiOPO4 Ferroelectric Crystal
Laura Sanchez-Garcia et al.
ADVANCED MATERIALS (2014)
Two-Color Surface Plasmon Polariton Enhanced Upconversion in NaYF4:Yb:Tm Nanoparticles on Au Nanopillar Arrays
QuocAnh Luu et al.
JOURNAL OF PHYSICAL CHEMISTRY C (2014)
Plasmon-Enhanced Energy Transfer for Improved Upconversion of Infrared Radiation in Doped-Lanthanide Nanocrystals
Qi-C. Sun et al.
NANO LETTERS (2014)
Vectorial Nanoscale Mapping of Optical Antenna Fields by Single Molecule Dipoles
Anshuman Singh et al.
NANO LETTERS (2014)
High-Efficiency Second Harmonic Generation from a Single Hybrid ZnO Nanowire/Au Plasmonic Nano-Oligomer
Gustavo Grinblat et al.
NANO LETTERS (2014)
Colorimetric Stress Memory Sensor Based on Disassembly of Gold Nanoparticle Chains
Xiaogang Han et al.
NANO LETTERS (2014)
All-Color Plasmonic Nanolasers with Ultralow Thresholds: Autotuning Mechanism for Single-Mode Lasing
Yu-Jung Lu et al.
NANO LETTERS (2014)
Core-shell potassium niobate nanowires for enhanced nonlinear optical effects
J. Richter et al.
NANOSCALE (2014)
Optical trapping and manipulation of plasmonic nanoparticles: fundamentals, applications, and perspectives
Alexander S. Urban et al.
NANOSCALE (2014)
Explosives detection in a lasing plasmon nanocavity
Ren-Min Ma et al.
NATURE NANOTECHNOLOGY (2014)
Optical Response of Metallic Nanoparticle Heteroaggregates with Subnanometric Gaps
Christos Tserkezis et al.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION (2014)
Threading plasmonic nanoparticle strings with light
Lars O. Herrmann et al.
NATURE COMMUNICATIONS (2014)
Au Nanorod Decoration on NaYF4:Yb/Tm Nanoparticles for Enhanced Emission and Wavelength-Dependent Biomolecular Sensing
Palanisamy Kannan et al.
ACS APPLIED MATERIALS & INTERFACES (2013)
Spontaneous Emission and Nonlinear Response Enhancement by Silver Nanoparticles in a Nd3+-Doped Periodically Poled LiNbO3 Laser Crystal
Eduardo Yraola et al.
ADVANCED MATERIALS (2013)
Phosphors for Solid-State White Lighting
Nathan C. George et al.
ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 43 (2013)
Gold nanorods and their plasmonic properties
Huanjun Chen et al.
CHEMICAL SOCIETY REVIEWS (2013)
A Core/Satellite Multifunctional Nanotheranostic for in Vivo Imaging and Tumor Eradication by Radiation/Photothermal Synergistic Therapy
Qingfeng Xiao et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2013)
Plasmon lasers: coherent light source at molecular scales
Ren-Min Ma et al.
LASER & PHOTONICS REVIEWS (2013)
Self-phase-locked degenerate femtosecond optical parametric oscillator based on BiB3O6
Venkata Ramaiah-Badarla et al.
LASER & PHOTONICS REVIEWS (2013)
Enhancement of Second Harmonic Signal in Nanofabricated Cones
F. Dutto et al.
NANO LETTERS (2013)
Selective Plasmon Enhancement of the 1.08 μm Nd3+ Laser Stark Transition by Tailoring Ag Nanoparticles Chains on a PPLN Y-cut
Pablo Molina et al.
NANO LETTERS (2013)
Optical trapping and manipulation of nanostructures
Onofrio M. Marago et al.
NATURE NANOTECHNOLOGY (2013)
Compact Engineering of Path-Entangled Sources from a Monolithic Quadratic Nonlinear Photonic Crystal
H. Jin et al.
PHYSICAL REVIEW LETTERS (2013)
Enhancement of Second-Harmonic Generation from Metal Nanoparticles by Passive Elements
Robert Czaplicki et al.
PHYSICAL REVIEW LETTERS (2013)
Lanthanide near infrared imaging in living cells with Yb3+ nano metal organic frameworks
Alexandra Foucault-Collet et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2013)
NIR-Responsive Photocatalytic Activity and Mechanism of NaYF4:Yb,Tm@TiO2 Core-Shell Nanoparticles
Yanna Tang et al.
ACS CATALYSIS (2013)
Ferroelectric Domain Engineered Photochemical Deposition for Area-Selectable Broadband Enhancement of Quantum Dot Photoluminescence
Kenny Lau et al.
ADVANCED OPTICAL MATERIALS (2013)
Photoreduction of SERS-Active Metallic Nanostructures on Chemically Patterned Ferroelectric Crystals
N. Craig Carville et al.
ACS NANO (2012)
Plasmonic Nanoparticle Networks for Light and Heat Concentration
Audrey Sanchot et al.
ACS NANO (2012)
Gold Nanoparticles in Chemical and Biological Sensing
Krishnendu Saha et al.
CHEMICAL REVIEWS (2012)
Surface plasmons in metallic nanoparticles: fundamentals and applications (vol 44, 283001, 2011)
M. A. Garcia
JOURNAL OF PHYSICS D-APPLIED PHYSICS (2012)
How Chain Plasmons Govern the Optical Response in Strongly Interacting Self-Assembled Metallic Clusters of Nanoparticles
Ruben Esteban et al.
LANGMUIR (2012)
Sensing with Multipolar Second Harmonic Generation from Spherical Metallic Nanoparticles
Jeremy Butet et al.
NANO LETTERS (2012)
Multiplexed and Electrically Modulated Plasmon Laser Circuit
Ren-Min Ma et al.
NANO LETTERS (2012)
Plasmonic Bowtie Nanolaser Arrays
Jae Yong Suh et al.
NANO LETTERS (2012)
Surface plasmon lasers: sources of nanoscopic light
Rupert F. Oulton
MATERIALS TODAY (2012)
Broadband dye-sensitized upconversion of near-infrared light
Wenqiang Zou et al.
NATURE PHOTONICS (2012)
Multifunctional solid state lasers based on ferroelectric crystals
M. O. Ramirez et al.
OPTICAL MATERIALS (2012)
Simultaneous generation of second to fifth harmonic conical beams in a two dimensional nonlinear photonic crystal
Luis Mateos et al.
OPTICS EXPRESS (2012)
Internal Q-switching and self-optical parametric oscillation in a two-dimensional periodically poled Nd:MgO:LiNbO3 laser
Y. H. Chen et al.
OPTICS LETTERS (2012)
Plasmonic Nanoantennas: Fundamentals and Their Use in Controlling the Radiative Properties of Nanoemitters
Vincenzo Giannini et al.
CHEMICAL REVIEWS (2011)
Photo-induced Ag deposition on periodically poled lithium niobate: Concentration and intensity dependence
Yang Sun et al.
JOURNAL OF APPLIED PHYSICS (2011)
Photoinduced Ag deposition on periodically poled lithium niobate: Wavelength and polarization screening dependence
Yang Sun et al.
JOURNAL OF APPLIED PHYSICS (2011)
Evolution of plasmonic response in growing silver thin films with pre-percolation non-local conduction and emittance drop
A. A. Earp et al.
JOURNAL OF PHYSICS D-APPLIED PHYSICS (2011)
On-chip steering of entangled photons in nonlinear photonic crystals
H. Y. Leng et al.
NATURE COMMUNICATIONS (2011)
Reversal of Enantioselectivity by Tuning the Conformational Flexibility of Phase-Transfer Catalysts
Ming-Qing Hua et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2010)
Synthesis and Characterization of Highly Efficient Near-Infrared Upconversion Sc3+/Er3+/Yb3+ Tridoped NaYF4
Qingming Huang et al.
JOURNAL OF PHYSICAL CHEMISTRY C (2010)
Optimum plasmon hybridization at percolation threshold of silver films near metallic surfaces
A. I. Maaroof et al.
JOURNAL OF PHYSICS D-APPLIED PHYSICS (2010)
Phase-Resolved Mapping of the Near-Field Vector and Polarization State in Nanoscale Antenna Gaps
M. Schnell et al.
NANO LETTERS (2010)
Efficient quantum memory for light
Morgan P. Hedges et al.
NATURE (2010)
Plasmonics for improved photovoltaic devices
Harry A. Atwater et al.
NATURE MATERIALS (2010)
Laser cooling of solids to cryogenic temperatures
Denis V. Seletskiy et al.
NATURE PHOTONICS (2010)
Lithium niobate X-cut, Y-cut, and Z-cut surfaces from ab initio theory
Simone Sanna et al.
PHYSICAL REVIEW B (2010)
Nonlinear Optical Properties of Core-Shell Nanocavities for Enhanced Second-Harmonic Generation
Ye Pu et al.
PHYSICAL REVIEW LETTERS (2010)
Broad emission band of Yb3+ in the nonlinear Nb:RbTiOPO4 crystal: origin and applications
J. J. Carvajal et al.
OPTICS EXPRESS (2010)
Confining Standing Waves in Optical Corrals
Yelizaveta Babayan et al.
ACS NANO (2009)
Near-Infrared Quantum Cutting for Photovoltaics
Bryan M. van der Ende et al.
ADVANCED MATERIALS (2009)
Nonlinear prism based on the natural ferroelectric domain structure in calcium barium niobate
P. Molina et al.
APPLIED PHYSICS LETTERS (2009)
Plasmon-enhanced luminescence in Yb3+:Y2O3 thin film and the potential for solar cell photon harvesting
Yalin Lu et al.
APPLIED PHYSICS LETTERS (2009)
All-optical polarization switch in a quadratic nonlinear photonic quasicrystal
Ayelet Ganany-Padowicz et al.
APPLIED PHYSICS LETTERS (2009)
Ferroelectric Lithography: Bottom-up Assembly and Electrical Performance of a Single Metallic Nanowire
Alexander Haussmann et al.
NANO LETTERS (2009)
Demonstration of a spaser-based nanolaser
M. A. Noginov et al.
NATURE (2009)
Plasmon lasers at deep subwavelength scale
Rupert F. Oulton et al.
NATURE (2009)
Nonlinear generation and manipulation of Airy beams
Tal Ellenbogen et al.
NATURE PHOTONICS (2009)
Effect of electron beam writing parameters for ferroelectric domain structuring LiNbO3:Nd3+
P. Molina et al.
OPTICAL MATERIALS (2009)
Field enhancement in metallic subwavelength aperture arrays probed by erbium upconversion luminescence
Ewold Verhagen et al.
OPTICS EXPRESS (2009)
Lasing in metal-insulator-metal sub-wavelength plasmonic waveguides
Martin T. Hill et al.
OPTICS EXPRESS (2009)
Multiorder nonlinear diffraction in frequency doubling processes
Solomon M. Saltiel et al.
OPTICS LETTERS (2009)
Strontium barium niobate as a multifunctional two-dimensional nonlinear Photonic Glass
Pablo Molina et al.
ADVANCED FUNCTIONAL MATERIALS (2008)
Ferroelectric lithography
Dongbo Li et al.
CERAMICS INTERNATIONAL (2008)
Generation of second-harmonic conical waves via nonlinear Bragg diffraction
Solomon M. Saltiel et al.
PHYSICAL REVIEW LETTERS (2008)
Surface-plasmon circuitry
Thomas W. Ebbesen et al.
PHYSICS TODAY (2008)
Quasi-three-level solid-state lasers in the near and mid infrared based on trivalent rare earth ions
M. Eichhorn
APPLIED PHYSICS B-LASERS AND OPTICS (2008)
Polarization and local reactivity on organic ferroelectric surfaces: Ferroelectric nanolithography using poly(vinylidene fluoride)
Christopher Rankin et al.
ACS NANO (2007)
Photocatalytic nanoparticle deposition on LiNbO3 nanodomain patterns via photovoltaic effect
Xiaoyan Liu et al.
APPLIED PHYSICS LETTERS (2007)
Enhanced nonlinear optical effects with a tapered plasmonic waveguide
Ewold Verhagen et al.
NANO LETTERS (2007)
Coexistence of localized and delocalized surface plasmon modes in percolating metal films
K. Seal et al.
PHYSICAL REVIEW LETTERS (2006)
Polarization-selective plasmon-enhanced silicon quantum-dot luminescence
Hans Mertens et al.
NANO LETTERS (2006)
Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers
Isabel Romero et al.
OPTICS EXPRESS (2006)
Fabrication of metallic nanowires on a ferroelectric template via photochemical reaction
J. N. Hanson et al.
NANOTECHNOLOGY (2006)
Near infrared and visible tunability from a diode pumped Nd3+ activated strontium barium niobate laser crystal
MO Ramírez et al.
APPLIED PHYSICS B-LASERS AND OPTICS (2005)
Optical properties of coupled metallic nanorods for field-enhanced spectroscopy
J Aizpurua et al.
PHYSICAL REVIEW B (2005)
Taking advantage of luminescent lanthanide ions
JCG Bunzli et al.
CHEMICAL SOCIETY REVIEWS (2005)
Continuous-wave laser operation at 1.3 μm in Nd3+-doped Zn:LiNbO3 channel waveguides
M Domenech et al.
APPLIED PHYSICS LETTERS (2004)
Ferroelectric lithography of multicomponent nanostructures
SV Kalinin et al.
ADVANCED MATERIALS (2004)
Atomic polarization and local reactivity on ferroelectric surfaces: A new route toward complex nanostructures
SV Kalinin et al.
NANO LETTERS (2002)
Local potential and polarization screening on ferroelectric surfaces
SV Kalinin et al.
PHYSICAL REVIEW B (2001)
Spatially selective photochemical reduction of silver on the surface of ferroelectric barium titanate
JL Giocondi et al.
CHEMISTRY OF MATERIALS (2001)
Simultaneous generation of red, green, and blue continuous-wave laser radiation in Nd3+-doped aperiodically poled lithium niobate
J Capmany
APPLIED PHYSICS LETTERS (2001)
Hexagonally poled lithium niobate: A two-dimensional nonlinear photonic crystal
NGR Broderick et al.
PHYSICAL REVIEW LETTERS (2000)