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@inproceedings{carlotto2022rf,
  title = {RF-sputtering fabrication of flexible glass-based 1D photonic crystals},
  author = {Carlotto, Alice and Sayginer, Osman and Chen, Hao and Tran, Lam TN and Dell’Anna, Rossana and Szczurek, Anna and Varas, Stefano and Babiarczuk, Bartosz and Krzak, Justyna and Bursi, Oreste S and others},
  year = {2022},
  journal = {Fiber Lasers and Glass Photonics: Materials through Applications III},
  volume = {12142},
  pages = {29--39},
  doi = {10.1117/12.2621281}
}

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@inproceedings{pietralunga2022tungsten,
  title = {Tungsten oxide films for near-infrared photonics and sensing},
  author = {Pietralunga, Silvia Maria and Chen, Hao and Carlotto, Alice and Sayginer, Osman and Tran, Lam TN and Chiasera, Alessandro},
  year = {2022},
  journal = {Fiber Lasers and Glass Photonics: Materials through Applications III},
  volume = {12142},
  pages = {22--28},
  doi = {10.1117/12.2626511}
}

Abstract

Breast cancer is a very common and serious condition that affects many women and needs early intervention to minimize the impact on health. Differentiation of the cancerous tissue from the healthy tissue can be carried out using electromagnetic waves by utilizing the different responses due to varying electromagnetic material characteristics. The specific absorption rate is a measurement of the absorbed electromagnetic energy in a volume which can be very useful in the detection of cancerous tissue. In this work, we focus on the design of an antenna that is distinctive in its geometric properties as it is bendable in two axes (both x and y) and hence can fit onto a half-spherical array. An antenna array that consists of antennas of size 18mm x 18mm x 2 mm is designed to be conformal to a bra's shape. A three-layered 3D breast model of different tissue types and a tumor medium is used to investigate the specific absorption rate through simulations.

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@inproceedings{9528753,
  title = {Design of a Wearable Microwave Antenna System for Breast Tumor Imaging},
  author = {Egecan Ozcakar and Osman Sayginer and Gullu Kiziltas},
  year = {2021},
  journal = {2021 International Applied Computational Electromagnetics Society Symposium (ACES)},
  doi = {10.1109/ACES53325.2021.00153},
  issn = {1054-4887},
  url = {https://ieeexplore.ieee.org/document/9528753}
}

Abstract

We introduce an easily implementable optomechanical device for pressure and vibration sensing using a multilayer structure on a flexible substrate. We present the design, fabrication and evaluation steps for a proof-of-concept device as well as optical glass components. The design steps include optical, mechanical, and optomechanical correlation simulations using the transfer matrix method, finite element analysis, geometric optics and analytical calculations. The fabrication part focuses on the deposition of multilayers on polymeric flexible substrates using the radio frequency sputtering technique. To investigate the quality of the glass coatings on polymeric substrates, atomic force microscopy and optical microscopy are also performed. Optical measurements reveal that, even after bending, there are no differences between multilayer samples deposited on the polymeric and SiO2 substrates. The performance assessment of the proof-of-concept device shows that the sensor resonance frequency is around 515 Hz and the sensor static response is capable of sensing from 50 Pa to 235 Pa.

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@article{sayginer2021111023,
  title = {Design, fabrication and assessment of an optomechanical sensor for pressure and vibration detection using flexible glass multilayers},
  author = {Osman Sayginer and Erica Iacob and Stefano Varas and Anna Szczurek and Maurizio Ferrari and Anna Lukowiak and Giancarlo C Righini and Oreste S Bursi and Alessandro Chiasera},
  year = {2021},
  journal = {Optical Materials},
  doi = {https://doi.org/10.1016/j.optmat.2021.111023},
  issn = {0925-3467},
  url = {https://www.sciencedirect.com/science/article/pii/S092534672100224X}
}

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@thesis{sayginer2021modelling,
  title = {Modelling and simulation of novel optoacoustic sensors for monitoring crack growth in pressure vessel steels},
  author = {Sayginer, Osman and others},
  year = {2021}
}

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@inproceedings{chen2021near,
  title = {Near-IR transparent conductive amorphous tungsten oxide thin layers by non-reactive radio-frequency magnetron sputtering},
  author = {Chen, Hao and Chiasera, Alessandro and Armellini, Cristina and Speranza, Giorgio and Varas, Stefano and Sayginer, Osman and Alfano, Antonio and Cassinelli, Marco and Caironi, Mario and Suriano, Raffaella and others},
  year = {2021},
  journal = {EPJ Web of Conferences},
  volume = {255},
  pages = {05003},
  doi = {10.1051/epjconf/202125505003},
  issn = {2100-014X}
}

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@inproceedings{chiasera2021photonic,
  title = {Photonic glass systems fabricated by RF sputtering on flexible substrates},
  author = {Chiasera, Alessandro and Sayginer, Osman and Iacob, Erica and Szczurek, Anna and Startek, Kamila and Tran, Lam Thi Ngoc and Varas, Stefano and Krzak, Justyna and Bursi, Oreste S and Zonta, Daniele and others},
  year = {2021},
  journal = {The European Conference on Lasers and Electro-Optics},
  pages = {jsv_2_2},
  doi = {10.1109/cleo/europe-eqec52157.2021.9542334}
}

Abstract

Tungsten oxide WO3-x is a transition metal oxide and a wide bandgap semiconductor, with a wide range of possible optical and photonic applications. In dependence on the fabrication techniques different stoichiometric ratios (x) and crystalline phases are obtained, which end up with an overall polymorph and extremely versatile material, characterized by tailorable dielectric properties. In particular, WO3-x thin film deposition by Radio-Frequency (RF) sputtering techniques provides a precise control of thickness, composition and nanostructure. In this work we introduce and discuss a specific process of deposition, that is magnetron RF-sputtering as a suitable way to grow WO3-x thin films with selected properties. Possibility of integrating WO3-x thin film on to one-dimensional (1D) photonic crystal structures is also explored. Films are transparent in the near and short-wavelength infrared optical spectral range. Their quality is assessed by morphological, structural and compositional characterizations. Dielectric properties are characterized by optical spectroscopy and ellipsometry, the latter also evaluates the degree of optical anisotropy of thin films in their crystalline phase. An 1D photonics bandgap structure is designed, formed by a SiO2–TiO2 multilayer and capped with a 450 nm-thick transparent WO3-x film, so that surface confinement and local enhancement of the optical field at 1416 nm in the topmost WO3-x layer is obtained.

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@article{chen2021100093,
  title = {Tungsten oxide films by radio-frequency magnetron sputtering for near-infrared photonics},
  author = {Hao Chen and Alessandro Chiasera and Stefano Varas and Osman Sayginer and Cristina Armellini and Giorgio Speranza and Raffaella Suriano and Maurizio Ferrari and Silvia Maria Pietralunga},
  year = {2021},
  journal = {Optical Materials: X},
  doi = {https://doi.org/10.1016/j.omx.2021.100093},
  issn = {2590-1478},
  url = {https://www.sciencedirect.com/science/article/pii/S2590147821000231}
}

Abstract

Multilayer structures are commonly used components in optics and photonics due to their unique properties to manipulate the spectral response of light. Multilayer-driven components for sensing purposes can bring some advantages such as high sensitivity, fast signal response, electromagnetic interference immunity, and low power consumption. Thus, a mechanically coupled optical system can be the right candidate for force and vibration detection. In this work, we propose and demonstrate an optomechanical sensing system for pressure and vibration detection using two multilayer structures, a circular membrane, a light source, and a photodiode. The design of this proposed system consists of two parts, which are optical design and mechanical design. In the optical design, we modeled the optical response of the multilayer structures in the visible spectra using the Transfer Matrix Method. The mechanical response, on the other hand, is calculated using finite element simulations via the COMSOL Multiphysics software. The multilayer structures are fabricated by RF-Sputtering technique and then integrated through a 3D printed mechanical housing. The sensor characteristics (sensitivity and resonance frequency) are experimentally investigated by a static loading test and a transient response analysis. Results are shown that the sensor frequency around 510 Hz and the sensitivity of the sensor about 50 Pa.

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@proceedings{sayginer2020a,
  title = {Design and fabrication of multilayer-driven optomechanical device for force and vibration sensing},
  author = {Osman Sayginer and Alessandro Chiasera and Stefano Varas and Anna Lukowiak and Maurizio Ferrari and Oreste S Bursi},
  year = {2020},
  journal = {Fiber Lasers and Glass Photonics: Materials through Applications II},
  doi = {10.1117/12.2555347}
}

Abstract

We present the radio frequency sputtering fabrication protocols for the fabrication on flexible polymeric substrates of glass-based 1D photonic crystals and erbium activated planar waveguides. Various characterization techniques, such as atomic force microscopy and optical microscopy, are employed to put in evidence the good adhesion of the glass coating on the polymeric substrates. Transmittance measurements are performed on the multilayer structure and indicate that there are no differences between the samples deposited on the polymeric and SiO_{2

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@proceedings{chiasera2020b,
  title = {Flexible photonics: RF-sputtering fabrication of glass-based systems operating under mechanical deformation conditions},
  author = {Alessandro Chiasera and Osman Sayginer and Erica Iacob and Anna Szczurek and Stefano Varas and Justyna Krzak and Oreste S Bursi and Daniele Zonta and Anna Lukowiak and Giancarlo C Righini and Maurizio Ferrari},
  year = {2020},
  journal = {Fiber Lasers and Glass Photonics: Materials through Applications II},
  doi = {10.1117/12.2551472}
}