Ensemble method to measure the potential energy of nanoparticles in an optical trap
| Autor: | Zhifang Lin, Joseph Junio, Joel A. Cohen, Jack C. Ng, H. Daniel Ou-Yang |
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| Rok vydání: | 2011 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Optical Tweezers business.industry Optical force Nanoparticle Trapping Potential energy Atomic and Molecular Physics and Optics Optics Optical tweezers Electric field Pressure Nanoparticles Physics::Atomic Physics Particle size Atomic physics Particle Size business Refractive index |
| Zdroj: | Optics letters. 36(8) |
| ISSN: | 1539-4794 |
| Popis: | A method is described for measuring the potential energy of nanoparticles in an optical trap by trapping an ensemble of particles with a focused laser beam. The force balance between repulsive osmotic and confining gradient-force pressures determines the single-particle trapping potential independent of interactions between the particles. The ensemble nature of the measurement permits evaluation of single-particle trapping energies much smaller than kBT. Energies obtained by this method are compared to those of single-particle methods as well as to theoretical calculations based on classical electromagnetic optics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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