Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles
Plasmonic nanoparticles are amongst the most effective ways to resonantly couple optical energy into and out of nanometer sized volumes. However, controlling and/or tuning the transfer of this incident energy to the surrounding near and far field is one of the most interesting challenges in this are...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2016-10-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/1.4954698 |
| _version_ | 1818144785570988032 |
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| author | A. Malasi H. Taz M. Ehrsam J. Goodwin H. Garcia R. Kalyanaraman |
| author_facet | A. Malasi H. Taz M. Ehrsam J. Goodwin H. Garcia R. Kalyanaraman |
| author_sort | A. Malasi |
| collection | DOAJ |
| description | Plasmonic nanoparticles are amongst the most effective ways to resonantly couple optical energy into and out of nanometer sized volumes. However, controlling and/or tuning the transfer of this incident energy to the surrounding near and far field is one of the most interesting challenges in this area. Due to the dielectric properties of metallic silver (Ag), its nanoparticles have amongst the highest radiative quantum efficiencies (η), i.e., the ability to radiatively transfer the incident energy to the surrounding. Here we report the discovery that bimetallic nanoparticles of Ag made with immiscible and plasmonically weak Co metal can show comparable and/or even higher η values. The enhancement is a result of the narrowing of the plasmon bandwidth from these bimetal systems. The phenomenological explanation of this effect based on the dipolar approximation points to the reduction in radiative losses within the Ag nanoparticles when in contact with cobalt. This is also supported by a model of coupling between poor and good conductors based on the surface to volume ratio. This study presents a new type of bandwidth engineering, one based on using bimetal nanostructures, to tune and/or enhance the quality factor and quantum efficiency for near and far-field plasmonic applications. |
| first_indexed | 2024-12-11T11:53:05Z |
| format | Article |
| id | doaj.art-69c7c33324f946ca8532e9f4402b8334 |
| institution | Directory Open Access Journal |
| issn | 2378-0967 |
| language | English |
| last_indexed | 2024-12-11T11:53:05Z |
| publishDate | 2016-10-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj.art-69c7c33324f946ca8532e9f4402b83342022-12-22T01:08:17ZengAIP Publishing LLCAPL Photonics2378-09672016-10-0117076101076101-1410.1063/1.4954698001604APPEnhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticlesA. Malasi0H. Taz1M. Ehrsam2J. Goodwin3H. Garcia4R. Kalyanaraman5Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, USABredesen Center, University of Tennessee, Knoxville, Tennessee 37996, USADepartment of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USAWebb School of Knoxville, Knoxville, Tennessee 37923, USADepartment of Physics, Southern Illinois University, Edwardsville, Illinois 62026, USADepartment of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, USAPlasmonic nanoparticles are amongst the most effective ways to resonantly couple optical energy into and out of nanometer sized volumes. However, controlling and/or tuning the transfer of this incident energy to the surrounding near and far field is one of the most interesting challenges in this area. Due to the dielectric properties of metallic silver (Ag), its nanoparticles have amongst the highest radiative quantum efficiencies (η), i.e., the ability to radiatively transfer the incident energy to the surrounding. Here we report the discovery that bimetallic nanoparticles of Ag made with immiscible and plasmonically weak Co metal can show comparable and/or even higher η values. The enhancement is a result of the narrowing of the plasmon bandwidth from these bimetal systems. The phenomenological explanation of this effect based on the dipolar approximation points to the reduction in radiative losses within the Ag nanoparticles when in contact with cobalt. This is also supported by a model of coupling between poor and good conductors based on the surface to volume ratio. This study presents a new type of bandwidth engineering, one based on using bimetal nanostructures, to tune and/or enhance the quality factor and quantum efficiency for near and far-field plasmonic applications.http://dx.doi.org/10.1063/1.4954698 |
| spellingShingle | A. Malasi H. Taz M. Ehrsam J. Goodwin H. Garcia R. Kalyanaraman Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles APL Photonics |
| title | Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles |
| title_full | Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles |
| title_fullStr | Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles |
| title_full_unstemmed | Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles |
| title_short | Enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic CoAg nanoparticles |
| title_sort | enhanced and tunable optical quantum efficiencies from plasmon bandwidth engineering in bimetallic coag nanoparticles |
| url | http://dx.doi.org/10.1063/1.4954698 |
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