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Updated: Jun 28, 2026

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Published on: February 25, 2017
Nanoscale Coherent Phonons with Broadband Frequency Tunability.
Zhengpu Zhao1, Da Wu1, Chuwei Zhang1
1Peking University, International Center for Quantum Materials, School of Physics, Beijing 100871, China.
Researchers developed nanoscale coherent phonons with tunable frequencies using a femtosecond laser and scanning tunneling microscope. This breakthrough enables precise control and detection of high-frequency mechanical motions for advanced phonon technologies.
Area of Science:
- Condensed Matter Physics
- Nanotechnology
- Quantum Optics
Background:
- Precise control of nanoscale coherent phonons is crucial for phonon-based technologies.
- Simultaneous nanometer spatial and femtosecond temporal resolution remains a significant challenge.
Purpose of the Study:
- To fabricate nanoscale coherent phonons with broadband frequency tunability.
- To achieve resonant detection and coherent control of phonons at unprecedented precision.
Main Methods:
- Utilized a femtosecond laser-combined scanning tunneling microscope (fs-STM).
- Employed ultrafast photocurrent enhanced by localized surface plasmons to track nanocluster motion.
- Generated coherent acoustic phonon modes via plasmon-induced hot electron pressure.
Main Results:
- Successfully fabricated nanoscale coherent phonons with broadband frequency tunability (15 GHz to 1 THz).
- Demonstrated frequency tuning by adjusting nanoparticle size.
- Achieved on-tip coherent phonon generation through precise tip manipulation.
Conclusions:
- The developed fs-STM technique enables highly controlled generation of broadband-tunable coherent phonons.
- This method offers a promising pathway for detecting high-frequency mechanical and electromagnetic fluctuations.
- Advances phonon-based technologies by providing nanometer spatial and femtosecond temporal precision.
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