Narrow-band and tunable intense terahertz pulses for mode-selective coherent phonon excitation
| Autor: | F. Giorgianni, Carlo Vicario, A. Trisorio, Stephan Allenspach, Christian Rüegg |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Phonon Terahertz radiation Physics::Optics 02 engineering and technology Laser pumping system 01 natural sciences 7. Clean energy Optical rectification broad-band generation 0103 physical sciences displacive 010302 applied physics business.industry superconductivity 021001 nanoscience & nanotechnology Coupling (physics) Modulation Molecular vibration Optoelectronics 0210 nano-technology business Excitation |
| Zdroj: | Applied Physics Letters |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0015612 |
| Popis: | We generate frequency-tunable narrow-band intense fields in the terahertz (THz) range by optical rectification of a temporally modulated near-infrared laser pumping a nonlinear organic crystal. Carrier-frequency tunability between 0.5 and 6.5THz is achieved by changing the modulation period of the laser pump. This tunable narrow-band THz source allows the selective coherent excitation of adjacent vibrational modes, which are demonstrated for two phonons with a frequency offset of 0.8THz in single-crystal SrCu2(BO3)(2). Our compact and scalable source enables an effective approach for the advanced manipulation of low-energy collective modes in condensed matter and has the potential to reveal the coupling of specific lattice vibrations with other degrees of freedom. |
| Databáze: | OpenAIRE |
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