Autor: Tyszkiewicz, Cuma - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Efficient, low-cost optical coupling mechanism for TiO2-SiO2 sol-gel derived slab waveguide surface grating coupler sensors
Autorzy:: Kaźmierczak, Andrzej
Słowikowski, Mateusz
Pavłov, Krystian
Filipiak, Maciej
Vervaeke, Michael
Tyszkiewicz, Cuma
Ottevaere, Heidi
Piramidowicz, Ryszard
Karasiński, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/1835968.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: polymer microlens
optical coupling
surface grating coupler
Opis:: We present an optical signal coupling scheme for slab waveguide surface grating coupler sensors. The proposed solution is based on the use of polymer microlenses. In this work we analyze two types of compact polymer lenses: the aspheric plano-convex lenses and Fresnel lenses. The feasibility of the proposed scheme is demonstrated by the experimental investigation into the optical signal coupling to the test structure of TiO2-SiO2 slab waveguide surface grating coupler using both types of lenses.
Źródło:: Optica Applicata; 2020, 50, 4; 539-549
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Cost-effective titania layers over 100 nm thick : effect of annealing on the structural, morphological, and optical properties
Autorzy:: Zięba, Magdalena
Tyszkiewicz, Cuma
Gondek, Ewa
Wojtasik, Katarzyna
Nizioł, Jacek
Dorosz, Dominik
Starzyk, Bartłomiej
Szymczak, Patryk
Pakieła, Wojciech
Rogoziński, Roman
Karasiński, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/27315694.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: sol-gel
titania layer
dip-coating
surface roughness
optical properties
Opis:: Titania dioxide (TiO₂) layers were synthesized via the acid-catalysed sol-gel route using titania (IV) ethoxide, and then annealed at temperatures varying in the range of 150-700 °C. The research concerned the effect of annealing temperature on the structure of TiO₂ layers, their surface morphology, and their optical properties. Further, X-ray diffractometry, and Raman spectroscopy were used to determine the structure of TiO₂ layers. Scanning electron and atomic force microscopy were used to study the surface morphology of TiO₂ layers. Transmittance, reflectance, absorption edge, and optical homogeneity were investigated by UV-VIS spectrophotometry, while the refractive index and thicknesses of TiO₂ layers were measured using a monochromatic ellipsometer. Chromatic dispersion characteristics of the complex refractive index were determined using spectroscopic ellipsometry. Structural studies have shown that the TiO₂ layers annealed at temperatures up to 300 °C are amorphous, while those annealed at temperatures exceeding 300 °C are polycrystalline containing only anatase nanocrystals with sizes increasing from 6 to 20 nm with the increase of the annealing temperature. Investigations on the surface morphology of TiO₂ layers have shown that the surface roughness increases with the increase in annealing temperature. Spectrophotometric investigations have shown that TiO₂ layers are homogeneous and the width of the indirect optical band gap varies with annealing temperature from 3.53 eV to 3.73 eV.
Źródło:: Opto-Electronics Review; 2023, 31, 4; art. no. e147913
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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