Trapping and movement of microparticles using the near field of waveguide modes enables the realization of stable and compact integrated optical platforms for manipulating, sorting, and studying ...single microobjects. In this work, the possibility of optical manipulation via Bloch surface waves propagating in polymer waveguides on the surface of a one-dimensional photonic crystal and localizing light at the waveguide surface is studied. Numerical simulation of optical forces acting on a spherical particle from the fundamental waveguide mode of the Bloch surface wave is performed. Using two-photon laser lithography, SU-8 polymer waveguides are fabricated on the surface of a one-dimensional photonic crystal. The movement of a polystyrene microparticle along the waveguide when the Bloch surface wave is excited in it is experimentally demonstrated.
The present work demonstrates the potential applicability of additive manufacturing to X-Ray refractive nano-lenses. A compound refractive lens with a radius of 5 µm was produced by the two-photon ...polymerization induced lithography. It was successfully tested at the X-ray microfocus laboratory source and a focal spot of 5 μm was measured. An amorphous nature of polymer material combined with the potential of additive technologies may result in a significantly enhanced focusing performance compared to the best examples of modern X-ray compound refractive lenses.
For the first time, the synthesis of organosilicon derivatives of dialkyl1benzothieno3,2-b1-benzothiophene (BTBT) capable of forming a semiconducting monolayer at the water-air interface is reported. ...Self-assembled monolayer organic field-effect transistors prepared from these materials using the Langmuir-Blodgett technique showed high hole mobilities and excellent air stability.
A new deep machine learning method is proposed for the task of selecting the parameters of a multilayer photonic structure to obtain a target optical spectrum of the reflection coefficient. The ...proposed training method is based on the connection of an artificial neural network for solving the inverse problem and the analytical transfer matrix method. This approach allows achieving high accuracy of the network. The developed method can be applied to the design of a structure that takes the derivative of the coordinate for an incident optical -signal.
Thin-film coatings of quartz crystal microbalance sensors with molecularly imprinted salbutamol are synthesized by photopolymerization using methacrylic acid and ethylene glycol dimethacrylate as ...functional and cross-monomers. The effects of the concentration of salbutamol and functional and cross-monomers in the prepolymerization mixture on the concentration of surface molecular imprints and the stability of the polymer layer with molecular imprints are shown. The conditions of the synthesis of polymer layers directly on the surface of the sensor electrode are optimized. Analytical characteristics of the sensor for the determination of salbutamol in aqueous solutions are calculated.
Abstract
In this work, we numerically study the luminescence of nanodiamonds with NV centres embedded in a polymer layer on the surface of one-dimensional photonic crystal. The interaction of NV ...center spontaneous emission with the Bloch surface wave (BSW) is demonstrated. The presence of a photonic crystal leads to a change in the angular distribution of the emitter radiation due to the coupling of luminescence to BSW. We show that the best coupling efficiency of 71% is observed when NV centres are located in the close proximity to the BSW field maximum.
In this paper we fabricate nonlinear optical nanocomposite based on CdSe quantum dots mixed with commercial photoresist SU-8, which can be structured by two-photon polymerization lithography. The ...distribution of quantum dots in the polymer was measured by transmission electron microscopy. Nonlinear optical properties of nanocomposite films were studied by third harmonic generation technique. We estimated the nonlinear cubic susceptibility of our nanocomposite.
Two-photon laser polymerization (TPP) is a state-of-the-art technology that allows for the submicron-resolution printing of freeform 3D objects to be harnessed in various applications, including ...physics, biology, medicine, and materials science. The TPP is based on using photosensitive polymeric materials that impose restrictions on the minimum feature size and limit the functionality of printed structures within the capabilities of polymers. One of the promising yet insufficiently studied methods for overcoming these limitations is pyrolysis–high-temperature annealing of polymer objects in an inert atmosphere. It may allow both to decrease the size of the objects and modify their chemical composition. Here, we compare the effect of pyrolysis on solid objects being tens of micrometers in size printed by TPP from three commercially available photoresists: IP-Dip, OrmoComp, and SZ2080. For the annealing temperatures of 450°C and 690°C in an argon atmosphere, we assessed the changes in size, chemical composition, and adhesion to the silicon wafer substrate. Our data may be promising for developing pyrolysis as a standard post-processing method for structures created via TPP technology.
The extraction of the tricarbonate complex of uranyl UO
2
(CO
3
)
3
4–
from aqueous solutions on clay powders from kaolin clays of the Kampanovskoye deposit and from bentonite clays of the 10th ...Khutor and Dinozavrovoe deposits, as well as their mixtures, was investigated. The studies were carried out with clay powders, both untreated and treated with water, 0.5 M Na
2
CO
3
and NaNO
3
solutions, and 2 M NaOH solutions. It was shown that the UO
2
(CO
3
)
3
4–
complex is not sorbed on clay materials from aqueous solutions under static conditions. The filtration of an aqueous solution of UO
2
(CO
3
)
3
4–
through columns with clay mixtures was established to enable the extraction up to 87% of uranium from the amount passed through the column.
Hydrazinecarboxylates have been synthesized by reacting substituted acetophenones with carbethoxyhydrazine. One of product is formed as a mixture of
E
- and
Z
-isomers. In the process of measuring ...the melting point of the resulting hydrazinecarboxylates, a transition of one crystalline form to another has been detected. That process has been recorded on video in “time-laps” mode for one of the substances.
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