Dr. Aleksandra Wieloszynska Profile

Dr. Aleksandra Wieloszynska

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Publications (3)

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Proceedings Article | 9 September 2019 Paper

Polarization-dependent optical absorption in phosphorene flakes

A. Wieloszyńska, P. Jakóbczyk, R. Bogdanowicz

Proceedings Volume 11085, 1108515 (2019) https://doi.org/10.1117/12.2528860

KEYWORDS: Transmittance, Absorption, Semiconducting wafers, Optical properties, Phosphorus, Polarization

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The interest of 2D materials is constantly increasing because of their very attractive mechanical, electrical and optical parameters. They have been used in many applications, e.g. photodetectors, sensors, modulators, insulators. One of the recently discovered 2D materials is phosphorene. In contrast to graphene, phosphorene has a direct bandgap tuned by numbers of layers in the 2D structure. The phosphorene flakes are strongly anisotropic. This study presents the detailed optical properties of electrochemically obtained phosphorene flakes versus centrifugation speed. A layer of phosphorene on a silicon wafer changes with increased centrifuge speed. A relationship that combines the size of the phosphorene flakes and ellipsometric angles, as well as the transmittance data obtained on a spectrophotometer was received. Hence, such an approach could allow for non-contact comparing the size of phosphorene flakes.

Proceedings Article | 23 August 2017 Paper

Advanced polarization sensitive analysis in optical coherence tomography

Aleksandra Wieloszyńska, Marcin Strąkowski

Proceedings Volume 10373, 103730Z (2017) https://doi.org/10.1117/12.2273962

KEYWORDS: Optical coherence tomography, Polarization, Birefringence, Optical imaging, Image resolution, Nondestructive evaluation, Biomedical optics

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The optical coherence tomography (OCT) is an optical imaging method, which is widely applied in variety applications. This technology is used to cross-sectional or surface imaging with high resolution in non-contact and non-destructive way. OCT is very useful in medical applications like ophthalmology, dermatology or dentistry, as well as beyond biomedical fields like stress mapping in polymers or protective coatings defects detection. Standard OCT imaging is based on intensity images which can visualize the inner structure of scattering devices. However, there is a number of extensions improving the OCT measurement abilities. The main of them are the polarization sensitive OCT (PS-OCT), Doppler enable OCT (D-OCT) or spectroscopic OCT (S-OCT). Our research activities have been focused on PS-OCT systems. The polarization sensitive analysis delivers an useful information about optical anisotropic properties of the evaluated sample. This kind of measurements is very important for inner stress monitoring or e.g. tissue recognition. Based on our research results and knowledge the standard PS-OCT provide only data about birefringence of the measured sample. However, based on the OCT measurements more information including depolarization and diattenuation might be obtained. In our work, the method based on Jones formalism are going to be presented. It is used to determine birefringence, dichroism and optic axis orientation of the tested sample. In this contribution the setup of the optical system, as well as tests results verifying the measurements abilities of the system are going to be presented. The brief discussion about the effectiveness and usefulness of this approach will be carried out.

Proceedings Article | 28 September 2016 Paper

Optical profilometer

Aleksandra Wieloszyńska, Marcin Strąkowski

Proceedings Volume 10031, 100310U (2016) https://doi.org/10.1117/12.2248123

KEYWORDS: Profilometers, Interferometers, Mirrors, Objectives, Photonics, Optical testing, Lenses, Beam splitters, Cameras, Actuators

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The profilometry plays a huge role in the most fields of science and technology. It allows to measure the profile of the surface with high-resolution. This technique is used in the fields like optic, electronic, medicine, automotive, and much more. The aim of the current work was to design and build optical profilometer based on the interference phenomena. The developed device has been working with He-Ne laser (632.8 nm). The optical parts have been chosen in order to reach the sized 2.0 mm x 1.6 mm of scanning area. The setup of the profilometer is based on Twyman-Green interferometer. Therefore, the phase distribution of the backreflected light from measured surface is recorded. The measurements are carried out with the aid of multiframe algorithms. In this approach we have used the Hariharan algorithm to obtain the exact value of the recorded phase. During tests, which have been carried out in order to check the functionality of the device, the interference patterns have been recoded and processed in order to obtain the 3D profile of measured surface. In this contribution the setup of the optical system, as well as signal processing methods are going to be presented. The brief discussion about the advantages and disadvantages, and usefulness of this approach will be carried out.

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