Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation
Colloidal copper nanorods (NRs) display transverse and longitudinal localized surface plasmon resonances. The longitudinal localized surface plasmon modes are tunable through the near‐infrared electromagnetic radiation energies with NR aspect ratios. Visible and near‐infrared transient optical respo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2022-03-01
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| Series: | Small Science |
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| Online Access: | https://doi.org/10.1002/smsc.202100103 |
| _version_ | 1819019444289011712 |
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| author | Benjamin T. Diroll Soojin Jeong Xingchen Ye |
| author_facet | Benjamin T. Diroll Soojin Jeong Xingchen Ye |
| author_sort | Benjamin T. Diroll |
| collection | DOAJ |
| description | Colloidal copper nanorods (NRs) display transverse and longitudinal localized surface plasmon resonances. The longitudinal localized surface plasmon modes are tunable through the near‐infrared electromagnetic radiation energies with NR aspect ratios. Visible and near‐infrared transient optical response of the copper NRs is investigated under excitation conditions spanning intraband and interband excitation (0.79−3.50 eV). In both the visible and near‐infrared regions, the spectral response of the samples under intraband excitation (<2 eV) differs substantially from their response under interband excitation (>2 eV). However, the timescale of the electron−phonon coupling estimated from pump fluence‐dependent measurements (τep) is less sensitive to excitation conditions than reports for gold. τep shortens slightly from ≈616 fs with intraband excitation (at visible probe energies) to ≈565 fs with interband excitation. The observed dynamics correspond to an average sample electron−phonon coupling parameter varying across all conditions from 4.4 × 1016 to 6.4 × 1016 J m−3 K−1, which is similar to bulk copper. Furthermore, coherent acoustic phonons are observed for the longitudinal localized surface plasmon resonance with a range of oscillatory periods reflecting sample size dispersion. |
| first_indexed | 2024-12-21T03:35:25Z |
| format | Article |
| id | doaj.art-e874b43673544395b54088cce28bcf4a |
| institution | Directory Open Access Journal |
| issn | 2688-4046 |
| language | English |
| last_indexed | 2024-12-21T03:35:25Z |
| publishDate | 2022-03-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Small Science |
| spelling | doaj.art-e874b43673544395b54088cce28bcf4a2022-12-21T19:17:22ZengWiley-VCHSmall Science2688-40462022-03-0123n/an/a10.1002/smsc.202100103Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband ExcitationBenjamin T. Diroll0Soojin Jeong1Xingchen Ye2Center for Nanoscale Materials Argonne National Laboratory 9700 S. Cass Avenue Lemont IL 60439 USADepartment of Chemistry Indiana University 800 E. Kirkwood Avenue Bloomington IN 47405 USADepartment of Chemistry Indiana University 800 E. Kirkwood Avenue Bloomington IN 47405 USAColloidal copper nanorods (NRs) display transverse and longitudinal localized surface plasmon resonances. The longitudinal localized surface plasmon modes are tunable through the near‐infrared electromagnetic radiation energies with NR aspect ratios. Visible and near‐infrared transient optical response of the copper NRs is investigated under excitation conditions spanning intraband and interband excitation (0.79−3.50 eV). In both the visible and near‐infrared regions, the spectral response of the samples under intraband excitation (<2 eV) differs substantially from their response under interband excitation (>2 eV). However, the timescale of the electron−phonon coupling estimated from pump fluence‐dependent measurements (τep) is less sensitive to excitation conditions than reports for gold. τep shortens slightly from ≈616 fs with intraband excitation (at visible probe energies) to ≈565 fs with interband excitation. The observed dynamics correspond to an average sample electron−phonon coupling parameter varying across all conditions from 4.4 × 1016 to 6.4 × 1016 J m−3 K−1, which is similar to bulk copper. Furthermore, coherent acoustic phonons are observed for the longitudinal localized surface plasmon resonance with a range of oscillatory periods reflecting sample size dispersion.https://doi.org/10.1002/smsc.202100103coherent acoustic phononscopperelectron−phononsnanorods |
| spellingShingle | Benjamin T. Diroll Soojin Jeong Xingchen Ye Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation Small Science coherent acoustic phonons copper electron−phonons nanorods |
| title | Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation |
| title_full | Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation |
| title_fullStr | Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation |
| title_full_unstemmed | Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation |
| title_short | Ultrafast Dynamics of Colloidal Copper Nanorods: Intraband versus Interband Excitation |
| title_sort | ultrafast dynamics of colloidal copper nanorods intraband versus interband excitation |
| topic | coherent acoustic phonons copper electron−phonons nanorods |
| url | https://doi.org/10.1002/smsc.202100103 |
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