Picosecond spectroscopy of polaritons in anthracene crystals. I. Preresonant scattering |
| |
| Institution: | 1. Refractories, Ceramics & Building Materials Department, National Research Centre, Cairo, Egypt;2. Nanomedicine and Tissue Eng. Lab., Medical Center of Excellence, National Research Centre, Cairo, Egypt;3. National Institute of Laser Enhanced Sciences (NILES), Cairo University, Cairo, Egypt;4. Egyptian Nanotechnology Center (EGNC), Cairo University, Zayed City, Giza, Egypt;5. Institute of NanoScience and Nanotechnology, Kafr El-Sheikh University, 33516 Kafr El-Sheikh, Egypt;1. Japan Society for the Promotion of Science, Chiyoda, Tokyo 102-8472, Japan;2. Department of Advanced Materials Sciences, Faculty of Engineering, Kagawa University, Takamatsu, Kagawa 761-0396, Japan;3. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan;4. Nano-Bioanalysis Research Group, Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa 761-0395, Japan;1. School of Physics, University of Hyderabad, Hyderabad, 500046, India;2. Department of Physics, Govt. Degree College, Anantnag, Khanabal, J&K 192101, India |
| |
| Abstract: | The resonant secondary emission spectrum of anthracene crystals is investigated by applying simultaneous time and frequency resolution. Under preresonant excitation the secondary emission of polaritons has an essentially nonexponential time behavior that depends strongly on the excitation frequency. At larger detunings the “Raman-like” lines, shifting together with excitation, have “fast” and a “slow” component, which correspond to different channels in populating the final polariton states. It is shown that such preresonant excitation can create a long-lived (≈1 ns) population of excitonic polaritons in the crystal. Group velocity plays the main role in the polariton dynamics. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
