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Modelling and analysis of fibre microlenses with ray-tracing and finite-difference methods

Śliwak Adam, Jeleń Mateusz, Patela Sergiusz

Opto-Electronics Review

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2022

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Vol. 30, No. 1

art. no. e140147

EN

Fibre optic microlenses are small optical elements formed on the end-faces of optical fibres. Their dimensions range from a few tens to hundreds of micrometres. In the article, four optical fibre microlenses are modelled and analysed. Microlenses are used for light beam manipulation and quantitative metrics are needed to evaluate the results, for example, the size of focusing spot or intensity distribution. All four lenses tested are made of rods of the same refractive index; they were welded to a single-mode fibre. Two modelling methods were used to analyse the lenses: ray-tracing and finite-difference time-domain. The ray-tracing algorithm moves rays from one plane to another and refracts them on the surfaces. Finite-difference time-domain consists of calculating Maxwell’s equations by replacing spatial and temporal derivatives by quotients of finite differences. In this paper, the results of the microlenses analyses obtained from ray-tracing and finite-difference timedomain methods were compared. Both mets of analysis showed the presence of undesirable side lobes related to lens design, namely rods too long for lens fabrication. The test results were compared with the measurements made with the knife-edge method. The use of a single tool to determine parameters of an optical fibre lens does not allow for precise determination of its properties. It is necessary to use different tools and programs. This allows a complete analysis of the beam parameters, letting us find the causes of technical issues that limit the performance of the lenses.

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Modelling of a two-dimensional photonic crystal as an antireflection coating for optoelectronic applications

Przybylski Dariusz, Patela Sergiusz

Opto-Electronics Review

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2019

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Vol. 27, No. 1

79--89

EN

In article a two-dimensional photonic crystal (PhC) is considered and modelled as a new generation antireflection coating for optoelectronic devices. Traditional antireflective coatings (ARCs) reduce the reflection of the radiation only – the new generation of antireflective coatings should affect the distribution of the radiation also. Such functionality can be provided by the two-dimensional PhC which reduce the reflection and scatter transmitted light. Prior to the fabrication, the PhCs should be designed and analysed. Results of the analysis should provide quantitative means for choice of materials and design solutions. In work, we analyse the electromagnetic field distribution as Poynting vectors inside the materials of optoelectronic devices, in order to investigate the possibility of improving the construction of future optoelectronic devices. Furthermore, we calculate the reflection and transmission of that ARC. It’s a complex optic analysis of new generation of ARC. The numerical analysis has been performed with the FDTD method in Lumerical Software. In work, we consider the two-dimensional photonic crystal on the top surface of optoelectronic structures. We compared the results with the traditional ARC from these same parameters as PhC: thickness and material. As an example, we presented the application of modelled, photonic crystal, thin-film, GaAs solar cells with PhC on top. The efficiency of this solar cell, using the photonic crystal, was improved by 6.3% over the efficiency of this same solar cell without PhC. Thus, our research strongly suggests that the unique properties of the photonic crystal could be used as a new generation of ARC.

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Przygotowanie i badanie warstw organicznych dla zastosowań fotowoltaicznych

Przybylski Dariusz, Zając Dorota, Patela Sergiusz

Napędy i Sterowanie

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2019

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R. 21, nr 2

103--105

PL

W artykule przedstawiono proces otrzymywania cienkich warstw organicznych. Nakładanie warstw na podłoża szklane odbywało się metodą spin-coatingu. Podczas procesu modyfikowane były takie parametry, jak: stężenie związku, rodzaj zastosowanego rozpuszczalnika, prędkość wirowania, czas wirowania oraz ilość naniesionej substancji. Zbadano właściwości otrzymanych cienkich warstw organicznych. Pomiaru ich grubości dokonano za pomocą profilometru optycznego, a następnie wynik zweryfikowano na profilometrze mechanicznym. Następnie zmierzono charakterystykę transmitancji na spektrofotometrze. W rezultacie przeprowadzonych prac opracowano technologię nanoszenia 100 nm warstw organicznych na podłoże szklane.