In this paper a nanostructure for DNA detection was proposed. The aim of the work is a theoretical analysis of the
construction. The optimal dimensions of the nanostructure were determined. The characteristics of the model were
obtained. It was revealed that the resonant wavelength changes by more than 100 nm, which can be detected even
without using any instruments.
In this paper, we present the results of the propagational dynamics of vortex beams array in the scope of their possible applications for non-contact robust and precision optical surface profilometry with nanoscale resolution. The result of coaxial superposition of the reference array with the object array of oppositely charged vortex beams represents a dynamically changing intensity distribution. The nature of this changes, namely, rotational effects of "two-petal” beams, allows to determine directly the phase delay between the beams which is introduced by the test object. We have analyzed the process of creating an array of singular beams and the features of experimental setup for detecting of reflecting and transmitting objects.
In this article, we analyze the possibilities of non-contact confinement of micron-sized absorbing particles using optical traps based on a spatially structured beam. The proposed method utilizes multi-beam interference with controllable parameters including tilt angles, waists and a number of superposed beams. The effectiveness of trapping and its selectivity to variable masses and shapes of particles is determined by axial symmetry of spatial intensity distribution at the trapping area. In addition to implementing non-contact trapping, optical visualization was performed with axial digital holographic microscopy in-situ. This method contributes to the accurate localization of studied specimens inside the cuvette.
Practical application of optical vortex in a method of three-dimensional profilometry with nanoscale resolution was considered. It was shown that phase analysis of coherent light beam carrying axial optical vortex allow to retrieve information about sample surface relief. High spatial resolution caused by vortex helical phase sensitivity to disturbances in wave front after reflection or spreading through studying sample, which can be optically transparent or have a reflecting surface. This method applicable for non-destructive testing of live cells and biological tissues in real-time regime with exceeding optical diffraction limit. Computer processing of vortex interferograms allow to achieve a vertical resolution down to 1.75 nm. Specially designed optical scheme reduces an environment influence, in particular, vibration, misalignment of test sample and its local anisotropy and provides the possibility of investigating surfaces of large linear dimensions. The prospective tasks of automated systems creation for monitoring of surface quality were proposed, in particular those that will could be developed with methods based on singular optics and phase singularities.
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