| 11. | Egecan Ozcakar; Osman Sayginer; Gullu Kiziltas Design of a Wearable Microwave Antenna System for Breast Tumor Imaging (Proceedings Article) In: 2021 International Applied Computational Electromagnetics Society Symposium (ACES), pp. 1-4, 2021, ISSN: 1054-4887. @inproceedings{9528753,
title = {Design of a Wearable Microwave Antenna System for Breast Tumor Imaging},
author = {Egecan Ozcakar and Osman Sayginer and Gullu Kiziltas},
url = {https://ieeexplore.ieee.org/document/9528753},
doi = {10.1109/ACES53325.2021.00153},
issn = {1054-4887},
year = {2021},
date = {2021-08-01},
urldate = {2021-08-01},
booktitle = {2021 International Applied Computational Electromagnetics Society Symposium (ACES)},
pages = {1-4},
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.},
keywords = {Conference, Supervised Work},
pubstate = {published},
tppubtype = {inproceedings}
}
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. |
| 10. | Alessandro Chiasera; Osman Sayginer; Erica Iacob; Anna Szczurek; Stefano Varas; Justyna Krzak; Oreste S Bursi; Daniele Zonta; Anna Lukowiak; Giancarlo C Righini; Maurizio Ferrari Flexible photonics: RF-sputtering fabrication of glass-based systems operating under mechanical deformation conditions (Proceedings) International Society for Optics and Photonics SPIE, vol. 11357, 2020. @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},
doi = {10.1117/12.2551472},
year = {2020},
date = {2020-01-01},
booktitle = {Fiber Lasers and Glass Photonics: Materials through Applications II},
volume = {11357},
pages = {1 -- 11},
publisher = {SPIE},
organization = {International Society for Optics and Photonics},
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} substrates, even after bending. Prism coupling technique is used to measure the optical parameter of the planar waveguide fabricated on flexible substrates. The ^{4}I_{13/2} → ^{4}I_{15/2} emission band, detected upon TE_{0} mode excitation at 514.5 nm, exhibits the spectral shape characteristic of Er^{3+} ions embedded in a crystalline environment.},
keywords = {Conference, Proceeding, Scopus Indexed},
pubstate = {published},
tppubtype = {proceedings}
}
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 SiO2 substrates, even after bending. Prism coupling technique is used to measure the optical parameter of the planar waveguide fabricated on flexible substrates. The 4I13/2 → 4I15/2 emission band, detected upon TE0 mode excitation at 514.5 nm, exhibits the spectral shape characteristic of Er3+ ions embedded in a crystalline environment. |
| 9. | Osman Sayginer; Alessandro Chiasera; Stefano Varas; Anna Lukowiak; Maurizio Ferrari; Oreste S Bursi Design and fabrication of multilayer-driven optomechanical device for force and vibration sensing (Proceedings) International Society for Optics and Photonics SPIE, vol. 11357, 2020. @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},
doi = {10.1117/12.2555347},
year = {2020},
date = {2020-01-01},
booktitle = {Fiber Lasers and Glass Photonics: Materials through Applications II},
volume = {11357},
pages = {255 -- 264},
publisher = {SPIE},
organization = {International Society for Optics and Photonics},
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.},
keywords = {Conference, Proceeding, Scopus Indexed},
pubstate = {published},
tppubtype = {proceedings}
}
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. |
| 8. | Z. Arslanturk; A. Sezgin; O. Sayginer Automated Design Framework for Thin Film Optical Coatings Using Material and Geometry Optimization (Conference) Şişecam International Glass Conference Combined With 34th Şişecam Glass Symposium “Glass In The Sustainable Future: Achieving What Is Possible, Istanbul, Turkey, 2019. @conference{cOllab3,
title = {Automated Design Framework for Thin Film Optical Coatings Using Material and Geometry Optimization},
author = {Z. Arslanturk and A. Sezgin and O. Sayginer},
url = {https://collab.sayginer.com/ifofo/abstract-presented-in-sisecam-34th-glass-symposium/},
year = {2019},
date = {2019-11-20},
booktitle = {Şişecam International Glass Conference Combined With 34th Şişecam Glass Symposium “Glass In The Sustainable Future: Achieving What Is Possible},
address = {Istanbul, Turkey},
abstract = {Thin-film optical coatings are commonly used elements in optical, electrical and architectural applications. Their ability to manipulate the spectral behavior of the light is especially beneficial in fields such as monitoring, sensing and communication. A thin film optical coating is a material layer made of dielectric or conductive material with nano to micrometer level thickness. Distribution of thin-film coating layers with different thickness and materials enable us to obtain optical systems with unique properties which cannot be achieved with a single material. In this work, we intended to develop a novel design tool which can replace commercial software available in the market. Thus, we propose an automated design framework enabling novel product developments for thin-film optical coatings. The goal of the framework is to build an autonomous design and optimization engine which can tailor the spectral response of an optical system by choosing coating materials, layer thicknesses and the number of layers. To do that, a Transfer Matrix Method is built based on a simulation model of the optical films. Then, the simulation model was coupled with the Genetic Algorithm which mimics the biological evolution. For a design objective, we aimed to lower transmission spectra response through the ultraviolet region while keeping the transmission response at the desired value for architectural purposes. Fabrication limitations were defined in collaboration with Turkiye Sise ve Cam Fabrikalari A.S. – Sisecam Science and Technology Center and they were incorporated in design process.
This project is being supported by The Scientific And Technological Research Council of Turkey (TUBITAK) 2209-B Industrial Research Funding Program for Undergraduate Students 2019/1},
keywords = {Conference, Supervised Work},
pubstate = {published},
tppubtype = {conference}
}
Thin-film optical coatings are commonly used elements in optical, electrical and architectural applications. Their ability to manipulate the spectral behavior of the light is especially beneficial in fields such as monitoring, sensing and communication. A thin film optical coating is a material layer made of dielectric or conductive material with nano to micrometer level thickness. Distribution of thin-film coating layers with different thickness and materials enable us to obtain optical systems with unique properties which cannot be achieved with a single material. In this work, we intended to develop a novel design tool which can replace commercial software available in the market. Thus, we propose an automated design framework enabling novel product developments for thin-film optical coatings. The goal of the framework is to build an autonomous design and optimization engine which can tailor the spectral response of an optical system by choosing coating materials, layer thicknesses and the number of layers. To do that, a Transfer Matrix Method is built based on a simulation model of the optical films. Then, the simulation model was coupled with the Genetic Algorithm which mimics the biological evolution. For a design objective, we aimed to lower transmission spectra response through the ultraviolet region while keeping the transmission response at the desired value for architectural purposes. Fabrication limitations were defined in collaboration with Turkiye Sise ve Cam Fabrikalari A.S. – Sisecam Science and Technology Center and they were incorporated in design process.
This project is being supported by The Scientific And Technological Research Council of Turkey (TUBITAK) 2209-B Industrial Research Funding Program for Undergraduate Students 2019/1 |
| 7. | Z. Arslanturk; A. Sezgin; O. Sayginer An Automated Design Framework for UV-AR Optical Filters (Conference) Nano-optics, Nanophotonics and Nanoplasmonics , 15th Nanoscience and Nanotechnology Conference , Antalya, Turkey, 2019. @conference{cOllab2,
title = {An Automated Design Framework for UV-AR Optical Filters},
author = {Z. Arslanturk and A. Sezgin and O. Sayginer},
url = {https://collab.sayginer.com/ifofo/abstract-presented-in-nanotr-15-conference/},
year = {2019},
date = {2019-11-05},
booktitle = {Nano-optics, Nanophotonics and Nanoplasmonics },
publisher = {15th Nanoscience and Nanotechnology Conference },
address = {Antalya, Turkey},
abstract = {Thin film optical filters are key components in optical, electrical and architectural applications. Thanks to their simple and flexible structures, these filters increase their popularity in numerous areas such as monitoring, sensing, communication etc. An optical filter consists of ordered dielectric material layers in the nano-micrometre thickness. Combination of these different layers can bring many superior properties which cannot be achieved with a single material, for instance, quarter-wave stack optical filters are widely used to block light at particular wavelengths. For this reason, the design of thin film structures plays an important role in research activities as well as product development.
In this study, we propose an automated design framework for UV-AR Optical Filters. The optical response of the filters is modeled and simulated using the Transfer Matrix Method. After that, the simulation model is coupled with the genetic algorithm which is a meta-heuristic optimization approach. The design objectives aim at to lower transmission spectra through the ultraviolet region while distributing equal transmission rates through the visible optical region in order to show realistic colors for architectural purposes. In order to achieve this goal, independently distributed material layers are considered for the initial design. Moreover, fabrication constraints are a defined in collaboration with Sisecam Turkey and limitations are taken into account through the design framework.
This project is being supported by The Scientific And Technological Research Council of Turkey (TUBITAK) 2209-B Industrial Research Funding Program for Undergraduate Students 2019/1
Keywords: Thin Film Optical Filters, Transfer Matrix Method, Genetic Algorithm, UV-AR Optical Filters},
keywords = {Conference, Supervised Work},
pubstate = {published},
tppubtype = {conference}
}
Thin film optical filters are key components in optical, electrical and architectural applications. Thanks to their simple and flexible structures, these filters increase their popularity in numerous areas such as monitoring, sensing, communication etc. An optical filter consists of ordered dielectric material layers in the nano-micrometre thickness. Combination of these different layers can bring many superior properties which cannot be achieved with a single material, for instance, quarter-wave stack optical filters are widely used to block light at particular wavelengths. For this reason, the design of thin film structures plays an important role in research activities as well as product development.
In this study, we propose an automated design framework for UV-AR Optical Filters. The optical response of the filters is modeled and simulated using the Transfer Matrix Method. After that, the simulation model is coupled with the genetic algorithm which is a meta-heuristic optimization approach. The design objectives aim at to lower transmission spectra through the ultraviolet region while distributing equal transmission rates through the visible optical region in order to show realistic colors for architectural purposes. In order to achieve this goal, independently distributed material layers are considered for the initial design. Moreover, fabrication constraints are a defined in collaboration with Sisecam Turkey and limitations are taken into account through the design framework.
This project is being supported by The Scientific And Technological Research Council of Turkey (TUBITAK) 2209-B Industrial Research Funding Program for Undergraduate Students 2019/1
Keywords: Thin Film Optical Filters, Transfer Matrix Method, Genetic Algorithm, UV-AR Optical Filters |
