研究目的
Investigating the spontaneous continuous orbital motion of nanoparticles levitated in air and its manipulation by light.
研究成果
The study demonstrates a spontaneous orbital motion of laser-trapped nanoparticles in air, which can be controlled by light. This opens up possibilities for manipulating nanoscale objects based on their cooperative dynamics.
研究不足
The orbital motion is sensitive to air pressure and vanishes at low pressure. The mechanism driving the orbital motion is not fully understood.
1：Experimental Design and Method Selection:
The experiment involves trapping nanoparticles in a standing-wave optical trap formed by retro-reflecting a single-frequency infrared laser. The motion of nanoparticles is detected via light scattering.
2：Sample Selection and Data Sources:
Cu2O nanoparticles with radii of about 80 nm are used, introduced into the trap via a mist of ethanol.
3：List of Experimental Equipment and Materials:
Includes a single-frequency infrared laser at 1550 nm, acousto-optic modulator (AOM), balanced photodetector (PD1), quadrant photodetector (QPD), CMOS camera, and UV light at 372 nm.
4：Experimental Procedures and Operational Workflow:
Nanoparticles are trapped and their motion is monitored. The orbital motion is observed and its dependence on air pressure and laser power is studied.
5：Data Analysis Methods:
The power spectral density (PSD) of the orbital motion is analyzed using a Lorentzian function to extract orbiting frequency and spectral width.
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infrared laser
1550 nm
Forming a standing-wave optical trap for nanoparticles.
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acousto-optic modulator
AOM
Controlling the intensity of the trapping beam.
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balanced photodetector
PD1
Detecting the motion of nanoparticles via subtracting the signal without nanoparticles from the signal with nanoparticles.
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quadrant photodetector
QPD
Providing the time evolution of the spatial distribution of the trapping beam.
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CMOS camera
Imaging the trapped nanoparticles.
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UV light
372 nm
Overlapped with the trapping laser for imaging nanoparticles.
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