Cathodoluminescence and optical absorption spectroscopy of plasmonic modes in chromium micro-rods
© 2022 IOP Publishing Ltd..
Manipulating light at the sub-wavelength level is a crucial feature of surface plasmon resonance (SPR) properties for a wide range of nanostructures. Noble metals like Au and Ag are most commonly used as SPR materials. Significant attention is being devoted to identify and develop non-noble metal plasmonic materials whose optical properties can be reconfigured for plasmonic response by structural phase changes. Chromium (Cr) which supports plasmon resonance, is a transition metal with shiny finished, highly non-corrosive, and bio-compatible alloys, making it an alternative plasmonic material. We have synthesized Cr micro-rods from a bi-layer of Cr/Au thin films, which evolves from face centered cubic to hexagonal close packed (HCP) phase by thermal activation in a forming gas ambient. We employed optical absorption spectroscopy and cathodoluminescence (CL) imaging spectroscopy to observe the plasmonic modes from the Cr micro-rod. The origin of three emission bands that spread over the UV-Vis-IR energy range is established theoretically by considering the critical points of the second-order derivative of the macroscopic dielectric function obtained from density functional theory (DFT) matches with interband/intraband transition of electrons observed in density of states versus energy graph. The experimentally observed CL emission peaks closely match thes-dandd-dband transition obtained from DFT calculations. Our findings on plasmonic modes in Cr(HCP) phase can expand the range of plasmonic material beyond noble metal with tunable plasmonic emissions for plasmonic-based optical technology.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:34 |
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| Enthalten in: |
Nanotechnology - 34(2022), 7 vom: 02. Dez. |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Ghorai, Gurupada [VerfasserIn] |
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| Links: |
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| Themen: |
Absorption spectroscopy |
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| Anmerkungen: |
Date Revised 02.12.2022 published: Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1088/1361-6528/aca339 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM348974086 |
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| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a © 2022 IOP Publishing Ltd. | ||
| 520 | |a Manipulating light at the sub-wavelength level is a crucial feature of surface plasmon resonance (SPR) properties for a wide range of nanostructures. Noble metals like Au and Ag are most commonly used as SPR materials. Significant attention is being devoted to identify and develop non-noble metal plasmonic materials whose optical properties can be reconfigured for plasmonic response by structural phase changes. Chromium (Cr) which supports plasmon resonance, is a transition metal with shiny finished, highly non-corrosive, and bio-compatible alloys, making it an alternative plasmonic material. We have synthesized Cr micro-rods from a bi-layer of Cr/Au thin films, which evolves from face centered cubic to hexagonal close packed (HCP) phase by thermal activation in a forming gas ambient. We employed optical absorption spectroscopy and cathodoluminescence (CL) imaging spectroscopy to observe the plasmonic modes from the Cr micro-rod. The origin of three emission bands that spread over the UV-Vis-IR energy range is established theoretically by considering the critical points of the second-order derivative of the macroscopic dielectric function obtained from density functional theory (DFT) matches with interband/intraband transition of electrons observed in density of states versus energy graph. The experimentally observed CL emission peaks closely match thes-dandd-dband transition obtained from DFT calculations. Our findings on plasmonic modes in Cr(HCP) phase can expand the range of plasmonic material beyond noble metal with tunable plasmonic emissions for plasmonic-based optical technology | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Au | |
| 650 | 4 | |a Cr | |
| 650 | 4 | |a absorption spectroscopy | |
| 650 | 4 | |a cathodoluminescence | |
| 650 | 4 | |a plasmonics | |
| 700 | 1 | |a Ghosh, Kalyan |e verfasserin |4 aut | |
| 700 | 1 | |a Das, Bidyadhar |e verfasserin |4 aut | |
| 700 | 1 | |a Sahoo, Subhashree |e verfasserin |4 aut | |
| 700 | 1 | |a Patra, Bikash |e verfasserin |4 aut | |
| 700 | 1 | |a Samal, Prasanjit |e verfasserin |4 aut | |
| 700 | 1 | |a Sahoo, Pratap K |e verfasserin |4 aut | |
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