在复合金属纳米结构中的等离子体

1、 报告人：Content1、introduction of plasma2、coupled metal NPs3、coupled NPs/metal film and NPs/NWs4、NWs network structures5、Conclusion 1、 introduction of plasma等离子体等离子体（Plasma）是一种由自由电子和带电离子为主要成分的物质形态，广泛存在于宇宙中，常被视为是物质的第四态，被称为等离子态，或者“超气态”，也称“电浆体”。等离子体的特性等离子体的特性 1、具有很高的电导率，和电磁场的耦合作用也极强 2、和一般气体不同，包含两到三种不同的组成粒子

2、，且组成粒子间的相互作用较大 3、速率分布可能偏离麦克斯韦分布 4、具有表面等离效应等离子体等离子体的的应用：应用：工业、农业、环保、军事、宇航、能源、天体等方面In metal nanoparticles , the collective oscillations of free electrons are confined in all three-dimensions, resulting in the reputed localized surface plasmons (LSPs). LSPslarge EM field applyLSPRdielectric environment

3、sensing techniques The electrons are free to move in one or two dimensions, thus SPPs can be excited and propagate along the metal/dielectric interface. the plasmonic properties of several typical types of complex metal nanostructureselectromagnetically coupled nanoparticlesNPs/metal filmsNPs/nanowi

4、res (NWs)NWs/NWs 2、Coupled medal NPs The influencing factors of the near field coupling 1、Anglethe incident electric fieldthe axis （Max） 2、 Gapgapenergyresonance peak Heterodimernovel optical properties Fano resonance. EM coupling（ non-spherical ） relative orientation. NPs dimers and “hot spots”The

5、nanogaps which strongly confine induced EM fields are supreme systems for SERS applicationsnanohole NPs arraysnanohole/NP pairs nanocube dimers nanorod dimerssingle molecule SERSplasmonic antennasplasmonic tweezers quantum plasmonicsnonlinear plasmonics3、Coupled NPs/metal film and NPs/NWsA dipole an

6、 image dipole （incident electric field surface）The system: the NP the imageLSPR is altered the interaction the distance3.1 NP over metal film (NPOF)The EM coupling between the NP and the image particle produce large field enhancement in the gap between the NP and the film1、The thickness of the film

7、is much larger than the diameter of the NP2、The film can then be treated as a mirror3.2 Coupled NPs/NWs Characteristic of NWsSPP characteristics in metal NWsApplications 4、NWs network structures 4.1 SPP routing in branched NWs 4.2 SPP interference in complex NWs networkBased on the SPs interference

8、principle, a complete set of plamonic logic gates and other functional devices can be realized by designing different NW networks6 Conclusion In complex metal nanostructures, the SPs in each single component interact with that in the others, for example, LSPs in a single NP can couple to that in ano

9、ther one or to SPPs in a NW or metal film,resulting in extra EM enhancement at the nanogaps. SPPs in different NWs can interfere with each other, making possible selective routing of propagating SPPs to desired output terminals. The complex EM interactions give rise to more flexibility in tailoring the SPs for advanced applications, such as remote SERS sensing and plasmonic logic gates. The dielectric substrate or surface coating is another critical parameter that affects the SPs properties, including the LSPR and the S