Theoretical studies of the electromagnetic response of metal nanoparticles
My PhD project aims at developing a set of theoretical models to explain the electromagnetic response of metal nanoparticles, ranging from sub-nanometer to hundreds of nanometers and bulk. Simple metals such as sodium and lithium serve to define the zeroth order approximation. The next step will b...
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| Format: | Thesis |
| Language: | English |
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2017
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| Online Access: | http://hdl.handle.net/10356/69938 |
| _version_ | 1811681322938138624 |
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| author | Xuan, Fengyuan |
| author2 | Claude Guet |
| author_facet | Claude Guet Xuan, Fengyuan |
| author_sort | Xuan, Fengyuan |
| collection | NTU |
| description | My PhD project aims at developing a set of theoretical models to explain the electromagnetic response of metal nanoparticles, ranging from sub-nanometer to hundreds of nanometers and bulk. Simple metals such as sodium and lithium serve to define the zeroth order approximation. The next step will be to consider particular role of d-electrons in noble metal and how it can be modeled while keeping the optical response driven fully by delocalized valence electrons. We introduce a modified Random Phase Approximation with exact Exchange. The jellium background of Ag cores is treated as a polarizable sphere, which screens the dipole component of the electron-electron interaction. Our model gives the blue shift as cluster size decreases for cationic Ag clusters which agrees well with experimental data. For clusters embedded in rare-gas matrix, we propose a similar polarization screening model. The dipole surface resonance peak is shifted to lower energy significantly. |
| first_indexed | 2024-10-01T03:39:07Z |
| format | Thesis |
| id | ntu-10356/69938 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:39:07Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/699382021-03-20T14:25:56Z Theoretical studies of the electromagnetic response of metal nanoparticles Xuan, Fengyuan Claude Guet Su Haibin Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU DRNTU::Science::Physics::Optics and light DRNTU::Science::Physics::Atomic physics::Quantum theory My PhD project aims at developing a set of theoretical models to explain the electromagnetic response of metal nanoparticles, ranging from sub-nanometer to hundreds of nanometers and bulk. Simple metals such as sodium and lithium serve to define the zeroth order approximation. The next step will be to consider particular role of d-electrons in noble metal and how it can be modeled while keeping the optical response driven fully by delocalized valence electrons. We introduce a modified Random Phase Approximation with exact Exchange. The jellium background of Ag cores is treated as a polarizable sphere, which screens the dipole component of the electron-electron interaction. Our model gives the blue shift as cluster size decreases for cationic Ag clusters which agrees well with experimental data. For clusters embedded in rare-gas matrix, we propose a similar polarization screening model. The dipole surface resonance peak is shifted to lower energy significantly. Doctor of Philosophy (IGS) 2017-04-04T11:31:26Z 2017-04-04T11:31:26Z 2017 Thesis Xuan, F. (2017). Theoretical studies of the electromagnetic response of metal nanoparticles. Doctoral thesis, Nanyang Technological University, Singapore. http://hdl.handle.net/10356/69938 10.32657/10356/69938 en 130 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light DRNTU::Science::Physics::Atomic physics::Quantum theory Xuan, Fengyuan Theoretical studies of the electromagnetic response of metal nanoparticles |
| title | Theoretical studies of the electromagnetic response of metal nanoparticles |
| title_full | Theoretical studies of the electromagnetic response of metal nanoparticles |
| title_fullStr | Theoretical studies of the electromagnetic response of metal nanoparticles |
| title_full_unstemmed | Theoretical studies of the electromagnetic response of metal nanoparticles |
| title_short | Theoretical studies of the electromagnetic response of metal nanoparticles |
| title_sort | theoretical studies of the electromagnetic response of metal nanoparticles |
| topic | DRNTU::Science::Physics::Optics and light DRNTU::Science::Physics::Atomic physics::Quantum theory |
| url | http://hdl.handle.net/10356/69938 |
| work_keys_str_mv | AT xuanfengyuan theoreticalstudiesoftheelectromagneticresponseofmetalnanoparticles |