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 investigated the absorption and luminescence spectra and the low-frequency spectra of dielectric losses of the nematic liquid crystal (NLC) suspensions with quantum dots (QDs) CdSe/ZnS with a core diameter of 3.5 nm and 5.0 nm. The changing of luminescence intensity and dielectric losses in the region below 103 Hz were observed as result variation of a concentration and a QDs size in the spectra of NLC/QDs suspensions in comparison with the pure NLC. Luminescence quenching of the NLC and the increase of dielectric loss in the spectra were found with the increasing CdSe/ZnS concentration in interval between 0.07 - 0.3 wt. %.
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