Enhancement of the IR absorption of a thin film on gold in the Otto ATR configuration |
| |
| Institution: | 1. São Paulo State University (UNESP), Institute of Chemistry, Araraquara. 55 Prof. Francisco Degni St, Araraquara, SP 14800-060, Brazil;2. MESA+ Institute, Photocatalytic Synthesis Group, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands;3. Industrial Chemistry, Ruhr-University Bochum, Universitätststr. 150, 44801 Bochum, Germany |
| |
| Abstract: | The enhancement infrared absorption of a thin KSCN film formed on a smooth gold surface has been observed in the Otto ATR prism configuration. The absorption intensity reaches the maximum at an incident angle slightly lower than the critical angle for total internal reflection at the prism/air interface, and the intensity attains to large values at sizable prism-metal distances. These facts clearly indicate that the enhancement does not arise from the excitation of a surface plasmon polariton. Theoretical calculations of the electromagnetic field strength in the prism-metal gap show that the enhancement comes from the optical cavity effect. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
