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Optical levitation of dielectric objects in an external electric field
Zemánková, Tereza ; Flajšmanová,, Jana (referee) ; Svak, Vojtěch (advisor)
The bachelor's thesis deals with the optical levitation of a dielectric microparticle in vacuum and its displacement by an external electric field. The theoretical part mathematically describes the laser beam, in which particles are stably trapped. Subsequently, the principles of optical trapping, particle confinement and the most common experimental geometries of optical traps, e.g. counter-propagating beams, optical levitation and optical tweezers, are introduced. Because the trapped particle behaves very similarly to a harmonic oscillator excited by white noise, at the end of the theoretical part there are presented the equations of motion of the particle and their solutions for various cases, including Langevin equation of motion. The experimental part describes two experimental setups, in the assembly of which I participated. In the last part results of two main experiments are presented - displacement of the trapped particle by an external electric field, including determination of its charge, driving the particle by controlled white noise and determination of the effective temperature of stochastic motion of the particle.
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Optical levitation of dielectric objects in an external electric field
Zemánková, Tereza ; Flajšmanová,, Jana (referee) ; Svak, Vojtěch (advisor)
The bachelor's thesis deals with the optical levitation of a dielectric microparticle in vacuum and its displacement by an external electric field. The theoretical part mathematically describes the laser beam, in which particles are stably trapped. Subsequently, the principles of optical trapping, particle confinement and the most common experimental geometries of optical traps, e.g. counter-propagating beams, optical levitation and optical tweezers, are introduced. Because the trapped particle behaves very similarly to a harmonic oscillator excited by white noise, at the end of the theoretical part there are presented the equations of motion of the particle and their solutions for various cases, including Langevin equation of motion. The experimental part describes two experimental setups, in the assembly of which I participated. In the last part results of two main experiments are presented - displacement of the trapped particle by an external electric field, including determination of its charge, driving the particle by controlled white noise and determination of the effective temperature of stochastic motion of the particle.
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