The study of charged particles in radio-frequency (RF) traps is associated with optical response registration. The common issue of optical collection efficiency is caused by the FR trap geometry, which restricts its coupling with optical equipment. To overcome this issue we propose a transparent surface RF traps with Indium Tin Oxide (ITO) thin-film electrodes. ITO sputtering techniques are well known and support deposition on any optical surface. The development of full transparent RF trap is associated with ITO refractive index and optical band gap optimisation while maintaining high electrical conductivity. Here we studied the ITO thin film properties depending on post-annealing temperature. We used the optimal procedure to develop transparent surface RF trap. We demonstrate a stable localization of charged microspheres in the electric field of the developed trap. The proposed approach allows full optical access to trapped charged particle.
Nowadays nanostructures are in demand in various fields from biomedicine to green energy. Photoluminescence (PL) spectral measurements are a powerful tool to study nanomaterials unique physical and optical properties. Most modern spectral approaches are associated with the study of a sample on a substrate or in colloidal solution. In turn, we propose a technique for studying the luminescence of a single object levitating in a quadrupole Paul trap. To verify the technique, we investigate PL spectra of individual trapped charged microcluster of CdSe/ZnS quantum dots. The results obtained open prospects of optical research on single particles isolated from the environment.
We experimentally study the UV and IR radiation impact on the dynamics of YAG:Yb3+ polycrystal microparticle levitated in a quadrupole Paul trap at atmospheric pressure. Micromotions of trapped particle are interpreted into instantaneous kinetic energy with a certain statistical mode. The microparticle kinetic energy statistical mode was determined for various powers of laser radiation. The kinetic energy statistical mode shows a nonlinear pattern with a dip at a power of 1.10 W for 1020 nm laser radiation. In turn, the dependence of the kinetic energy statistical mode on the power of 405 nm laser radiation remains monotonous. The kinetic energy dip of YAG:Yb3+ trapped microparticle under infrared radiation is discussed in terms of both the internal and the translational laser cooling
We consider the effective potential in a linear Paul trap with an asymmetrical power supply system. Only the DC voltage component is applied to the one pair of rod electrodes, and only the AC component is applied to the other pair. We propose an analytical description of the effective potential for an asymmetrical power supply scheme. Mathematical simulation shows the effective potential splitting along the axis of the trap. To confirm the proposed description, we perform an experimental localization of starch microparticles with an asymmetrical power supply system. The charged microparticles localization area splitting into two spatially separated areas along the trap axis is shown.
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