研究目的
Investigating the approach for in situ construction of permanent mesoscale structures from optically bound nanoparticles using optical tweezers and photocurable hydrogels.
研究成果
The study successfully demonstrated the fabrication of permanent optical matter structures through the combination of optical binding interactions and in situ photopolymerization, offering potential applications in the bottom-up assembly of photonic materials and devices.
研究不足
Challenges in immobilizing optical matter structures with a large number of nanoparticles due to changes in refractive index and medium volume during photopolymerization.
1：Experimental Design and Method Selection
Utilized optical tweezers to trap and self-organize metal nanoparticles into various optical matter structures, followed by selective immobilization using photocurable hydrogels upon UV light illumination.
2：Sample Selection and Data Sources
Au nanoparticles with a diameter of ~150 nm were used, diluted in an aqueous solution of PEGDA with photoinitiator Irgacure 2959.
3：List of Experimental Equipment and Materials
CW Ti:Sapphire laser (Spectra-Physics 3900S),Spatial light modulator (Hamamatsu X13138-02),Objective (NA = 1.2, Olympus UPLSAPO 60XW),Inverted microscope (Olympus IX73),UV LED lamp (Thorlabs M365LP1),CMOS camera (Point Grey Grasshopper3)
4：Experimental Procedures and Operational Workflow
Nanoparticles were trapped and organized by optical tweezers, then immobilized by photopolymerization upon UV light illumination. The process was visualized in real-time using dark-field microscopy.
5：Data Analysis Methods
Particle positions were tracked by TrackMate in ImageJ, and interparticle separations were analyzed using a custom-written MATLAB code.
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CW Ti:Sapphire laser
3900S
Spectra-Physics
Generating a Gaussian beam with a wavelength of 800 nm for optical trapping.
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Spatial light modulator
X13138-02
Hamamatsu
Modulating the Gaussian beam for generating optical traps with tunable sizes and shapes.
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Objective
UPLSAPO 60XW
Olympus
Focusing the selected optical trap in an inverted microscope.
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Inverted microscope
IX73
Olympus
Visualizing the nanoparticles with a high NA dark-field condenser.
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UV LED lamp
M365LP1
Thorlabs
Providing UV light for activating the photoinitiator and starting the photopolymerization.
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CMOS camera
Grasshopper3
Point Grey
Recording the nanoparticles visualized by the objective.
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