Mode-selective excitation of an infrared-inactive phonon mode in diamond using mid-infrared free electron laser
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-08-26 |
| Journal | Japanese Journal of Applied Physics |
| Authors | Rei Akasegawa, Heishun Zen, Kan Hachiya, Kyohei Yoshida, T. Goto |
| Institutions | Kyoto University, Kumamoto Industrial Research Institute |
| Citations | 4 |
Abstract
Section titled āAbstractāAbstract The direct demonstration was achieved for the selective excitation of the infrared-inactive T 2g mode (1332 cm ā1 ) in the single crystal diamond by two-photon excitation using a mid-infrared free electron laser (MIR-FEL) as pump light. Anti-Stokes Raman scattering light at around ā1339 cm ā1 was observed with cooling at 5 K only when MIR-FEL whose wavenumber was that of one-half of the T 2g mode, 666 cm ā1 , was irradiated. Update of the probe system, i.e. the introduction of the image intensified CCD, made it possible to probe the scattering signal with a lower laser power density compared to our previous study, and it relieved the surface damage on the sample accompanied by laser irradiations which induced a red-shift and a band broadening of the mode in the previous study.