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タイトル: | Mechanism of enhancement in absorbance of vibrational bands of adsorbates at a metal mesh with subwavelength hole arrays. |
著者: | Etou, Junji Ino, Daisuke Furukawa, Daisuke Watanabe, Kazuya https://orcid.org/0000-0003-4156-1181 (unconfirmed) Nakai, Ikuyo F Matsumoto, Yoshiyasu |
著者名の別形: | 松本, 吉泰 |
発行日: | 7-Apr-2011 |
出版者: | Royal Society of Chemistry |
誌名: | Physical chemistry chemical physics : PCCP |
巻: | 13 |
号: | 13 |
開始ページ: | 5817 |
終了ページ: | 5823 |
抄録: | We have investigated the mechanism of enhanced absorption intensities of vibrational bands of adsorbates on copper meshes with subwavelength holes by measuring and simulating temporal profiles of infrared pulses transmitted through the meshes. As reported previously [Williams et al., J. Phys. Chem. B, 2003, 107, 11871], the absorption intensities of CH stretching bands of alkanethiolate adsorbed on the mesh increase substantially with decreasing hole size. The enhancements of absorption intensities are associated with temporal delays of infrared pulses transmitted through the mesh. Finite difference time domain calculations reproduce the observed pulse delays as a function of hole size. These facts indicate that the delays of transmitted pulses are not caused by coupling of infrared radiation to surface plasmon polaritons propagating on the front and rear surfaces of the mesh, but they are caused by the reduction in group velocity owing to coupling to waveguide modes of mesh holes. Consequently, the strong enhancements of the absorption intensities are attributed to adsorbates inside the holes rather than to those on the mesh surfaces that have been proposed previously. |
著作権等: | © the Owner Societies 2011 This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/158364 |
DOI(出版社版): | 10.1039/c0cp01627f |
PubMed ID: | 21327205 |
出現コレクション: | 学術雑誌掲載論文等 |
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