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Chinese Optics Letters 2007年第12期5卷 709-711页

作者： Weibin Chen Qiwen Zhan Electro-Optics Graduate Program University of Dayton 300 College Park Dayton Ohio 45469-0245 USA

Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM

关键词： field enhancement Finite element method Metrology Near field scanning optical microscopy Polarization Rayleigh scattering

Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure

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Chinese Physics B 2015年第8期24卷 517-522页

作者：王彬兵周骏陈栋方云团陈明阳 Institute of Photonics Faculty of Science Ningbo University School of Computer Science and Telecommunication Engineering Jiangsu University School of Mechanical Engineering Jiangsu University

According to the plasmon hybridization theory, the plasmon resonance characteristics of the gold nanocrescent/nanoring(NCNR) structure are systematically investigated by the finite element method. It is found that the extinction spectra of NCNR structure exhibit multiple plasmon resonance peaks, which could be attributed to the result of the plasmon couplings between the multipolar plasmon modes of nanocrescent and the dipolar, quadrupolar, hexapolar, octupolar,decapolar plasmon modes of nanoring. By changing the geometric parameters, the intense and separate multiple plasmon resonance peaks are obtained and can be tuned in a wide wavelength range. It is further found that the plasmon coupling induces giant multipole electric field enhancements around the tips of the nanocrescent. The tunable and intense multiple plasmon resonances of NCNR structure may provide effective applications in multiplex biological sensing.

关键词： localized surface plasmon resonance field enhancement coherent couplings biological sensors

Hydrothermal Synthesis and field enhancement Behavior of ZnO Nanorods Pattern

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Chinese Journal of Chemical Physics 2011年第6期24卷 753-758,I0004页

作者：汤儆杜琳庞文辉郑晶晶田小春庄金亮福州大学化学化工学院教育部暨福建省食品安全和分析检测重点实验室福州350108 法兰克福大学无机及分析化学研究所法兰克福60325

We provide a new way to prepare ZnO nanorods pattern from the solution composed of hexamethylenetetramine （HMT） and Zn（NO3）2. The substrate is ITO substrate covered by well ordered Au islands. Since Au and the underneath ITO substrate have two different nucleation rates in the initial stage of heterogeneous nucleation process, the subsequent ZnO growth on the quick nucleating area takes place under diffusion control and is able to confine the synthesis of ZnO nanorods to specific locations. The concentrations of zinc nitrate and HMT are well adjusted to show the possibility of the new route for the patterning of the ZnO nanorods. Furthermore, the nanorods pattern was characterized by X-ray diffraction and photoluminescence and the performance of field emission property from ZnO nanorod patterns was investigated. The ZnO nanorods pattern with a good alignment also shows a good field enhancement behavior with a high value of the field enhancement factor.

关键词： Heterogeneous nucleation ZnO nanorods pattern Selective growth field enhancement

An on-Si directional second harmonic generation amplifier for MoS2/WS2 heterostructure

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Nano Research 2023年第3期16卷 4061-4066页

作者： Jiaxing Du Jianwei Shi Chun Li Qiuyu Shang Xinfeng Liu Yuan Huang Qing Zhang School of Materials Science and Engineering Peking UniversityBeijing 100871China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Transition metal dichalcogenides(TMD)heterostructure is widely applied for second harmonic generation(SHG)and holds great promises for laser source,nonlinear switch,and optical logic ***,for atomically thin TMD heterostructures,low SHG conversion efficiency would occur due to reduction of light-matter interaction length and lack of phase ***,we demonstrated a facile directional SHG amplifier formed by MoS2/WS2 monolayer heterostructures suspended on a holey SiO_(2)/Si *** SHG enhancement factor reaches more than two orders of magnitude in a wide spectral range from 355 to 470 nm,and the radiation angle is reduced from 38°to 19°indicating higher coherence and better emission *** giant SHG enhancement and directional emission are attributed to the great excitation and emission field concentration induced by a self-formed vertical Fabry-Pérot *** discovery gives helpful insights for the development of two-dimensional(2D)nonlinear optical devices.

关键词： two-dimensional(2D)materials transition metal dichalcogenides heterostructure second harmonic generation field enhancement optical microcavity

Unveiling multimodal hot carrier excitation in plasmonic bimetallic Au@Ag nanostars for photochemistry and SERS sensing

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NANO RESEARCH 2024年第12期17卷 10355-10362页

作者： Negrin-Montecelo, Yoel Elsaidy, Amir Giraldez-Martinez, Jesus Carbo-Argibay, Enrique Wang, Zhiming Govorov, Alexander O. Alvarez-Puebla, Ramon A. Correa-Duarte, Miguel A. Besteiro, Lucas V. Univ Rovira & Virgili Dept Phys & Inorgan Chem Carrer Marcelli Domingo S-N Tarragona 43007 Spain Mil Tech Coll Dept Chem Engn Cairo 4393010 Egypt Univ Vigo CINBIO Campus Univ Vigo Vigo 36310 Spain Int Iberian Nanotechnol Lab Ave Mestre Jose Veiga S-N P-4715330 Braga Portugal Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China Ohio Univ Dept Phys & Astron Athens OH 45701 USA ICREA Passeig Lluis Co 23 Barcelona 08010 Spain Univ Vigo Southern Galicia Inst Hlth Res IISGS Vigo 36310 Spain Univ Vigo Biomed Res Networking Ctr Mental Hlth CIBERSAM Vigo 36310 Spain

Plasmonic nanostructures stand at the forefront of nanophotonics research, particularly in sensing and energy conversion applications. Their unique ability to confine light energy at the nanoscale makes them indispensable for a wide array of technological advancements. The study of these structures often makes use of different materials and, even more extensively, explores new shapes and configurations to extend our common repertoire of useful nanophotonics tools. Exploring the creation of bimetallic plasmonic nanostructures combines these two dimensions determining the space of possible plasmonic resonators and opens the possibility of tailoring systems with behavior unavailable to single-metal plasmonic structures. In this paper, we delve into the exploration of bimetallic systems employing plasmonic nanostars. These structures have demonstrated remarkable capabilities for surface-enhanced Raman scattering (SERS) spectroscopy and photochemistry, due to the strong plasmonic response of their peaks, whose disposition following a spherical symmetry makes them largely polarization- and orientation-insensitive. Herein, we report the colloidal synthesis of two different water-stable Au@Ag nanostars, explore their performance as photocatalysts and SERS substrates, and provide an in-depth account of their non-trivial physical response.

关键词： hot-electrons field enhancement nanohybrids photocatalysis surface-enhanced Raman scattering (SERS) plasmonics

Extra-narrowband metallic filters with an ultrathin single-layer metallic grating

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Chinese Physics B 2020年第6期29卷 242-248页

作者： Ran Wang Qi-Huang Gong Jian-Jun Chen State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Microelectronics Instruments and Equipments R&D Center Institude of Microelectronics of Chinese Academy of SciencesBeijing 100029China Nano-optoelectronics Frontier Center of Ministry of Education(NFC-MOE)&Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood’s anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood’s anomaly in the ultrathin(thickness H = 60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth(transmittance T > 60%) at λ = 1200 nm is as small as △λFWHM=1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q = λ/△λFWHM= 750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter(H = 60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about △λFWHM = 10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

关键词： metallic filter extra-narrowband field enhancement Wood’s anomaly

Fano-like resonance characteristics of asymmetric Fe_2O_3@Au core/shell nanorice dimer

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Chinese Physics B 2014年第8期23卷 474-480页

作者：王彬兵周骏张昊鹏陈金平 Institute of Photonics Faculty of Science Ningbo University

A geometrical configuration of Fe2O3/Au core-shell nanorice dimer is proposed and its multipolar plasmon Fano- like resonance characteristics are theoretically investigated by generalizing the plasmon hybridization model of individual nanorice to the bright and dark modes of the nanorice dimer. Under the irradiation of polarization light, the extinction spectra of the nanorice dimer are numerically simulated by using the finite element method （FEM）. Our studies show that the Fano-like resonance of the nanorice dimer results in an asymmetric line shape of the Fano dip in the extinction spectrum which can be controlled by varying the structure parameters of the nanorice dimer. Meanwhile, there is a giant field enhancement at the gap between the two nanorices on account of the plasmonic coupling in the nanorice dimer. The aforementioned two characteristics of the nanorice dimer are useful for plasmon-induced transparency and localized surface plasmon resonance sensors.

关键词： localized surface plasmon resonance field enhancement nanorice plasmon hybridization

Strong guiding of light in hollow nanowire structures

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Chinese Optics Letters 2007年第9期5卷 543-545页

作者： Liang Chen James De Leon Xiaomin Jin Nano Photonics Inc. 21G Olympia Ave. Suite 50 Woburn MA 01801 USA ElectricaJ Engineering Department California Polytechnic State University San Luis Obispo CA 93407 USA

We have theoretically investigated the guiding mode patterns of hollow nanowires. Two types of nanowires, round shape and hexagonal shape, are examined with different combination of outer and inner radii. Because of electric field discontinuity at hollow interfaces and evanescent modes overlap in low refractive index region, strong light guiding and confinement are achieved in both hollow wire structures.

关键词： Electric fields field enhancement Nanowires Refractive index Slot waveguides Waveguides

Laser wavelength effects on(Ti,Al,Si)N in near-field laser nanostructuring by micron optical fiber enhanced irradiation

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Science China(Technological Sciences) 2013年第12期56卷 3012-3016页

作者： LIU DaMeng LIU JiaChen WANG Hui SU Kang SHAO TianMin State Key Laboratory of Tribology Tsinghua University

The effects of laser wavelengths(1064,532,355 and 266 nm)on nano-processing of fabricating a groove structure on(Ti,Al,Si)N alloy film using the micro-fiber near-field enhanced irradiation are *** is observed that variations of laser wavelength can effectively change the widths of the groove structures,which are featured as one-dimension bowl-like *** minimum of the groove width can be achieved at 293 nm with a 532 nm laser *** order to fabricate the groove in nanoscale,enough energy is delivered onto(Ti,Al,Si)N surface by a single laser *** results are also discussed to understand the experimental results.

关键词： micro-fiber field enhancement nano-optics nanostructuring