Doktorské studium

Studijní obor Vlnová a částicová optika

Název práce: Laserové zachycení a chlazení nanočástic

Školitel: prof. RNDr. Pavel Zemánek, Ph.D.

Oficiální zadání:
Current optical micromanipulation techniques include many unique tools and methods that enable spatial localization of microobjects (including living cells) in a laser beam (so-called optical tweezers), 3D manipulations with several objects, contactless and sterile separation of microobjects or suspension components, surface arrangement of microparticles and their transport. Optical tweezers use single focused laser beam for spatial confinement and manipulation of microobjects. Laser wavelength is chosen so that it is not absorbed by the object and therefore the object is not damaged. Majority of experiments is performed in water and exceptionally in air, however here the particle strongly interacts with the environment and its motion is overdamped. Namely suppression of particle interaction with environment and possibility to change dynamically the shape of the trapping potential by spatial laser beam intensity profile lead to experimental realization of miniature mechanical oscillator in vacuum. Interaction of a nanoparticle with laser beam can also lead to decrease of mechanical energy of the nanoparticle in the potential profile, i.e. to the so-called laser cooling of nanoparticle. Described experimental system enables observation of many unique experimental effects from the domain of classical physics and we hope that also from quantum mechanics. The main goal of the proposed PhD thesis will be to setup unique experimental system in the Institute of Scientific Instruments of the ASCR in Brno. Experimental system will be used for study of nanoparticle motion in harmonic and anharmonic potentials, laser cooling of nanoparticles, interactions between cooled nanoparticles and environment. The PhD student is expected to perform the experiments, analysed and interpret the results. The Institute of Scientific Instruments of the ASCR will provide all material conditions for this work for 4 years, has 20 year history in optical micromanipulation techniques, collaborates with a number of laboratories around the world and belongs to the leading world-wide players in the this area. The activities will be financially supported by the Centre of excellence for classical and quantum interactions (CSA 14-36681G) and Centre of advanced diagnostic methods and technologies – ALISI (MEYS LO1212). References: 1. Jonáš, A., Zemánek, P.: Light at work: The use of optical forces for particle manipulation, sorting, and analysis, Electrophoresis 29 (2008) 4813-4851. 2. Gieseler, J. et al: Subkelvin parametric feedback cooling of a laser-trapped nanoparticle, Phys. Rev. Lett. 109 (2012) 103603 3. Barker, P.F.: Doppler cooling a microsphere, Phys. Rev. Lett. 105 (2010) 073002 4. Giesel J., Novotny L., Quidant, R.: Thermal nonlinearities in a nanomechanical oscillator, Nature Physics 9 (2013) 806-810 5. Li, T., Kheifets, S., Raizen, M.G.: Milikelvin cooling of an optically trapped microsphere in vacuum, Nature Physics 7 (2011) 527-530.

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