Refractive index control in bicomponent polymer films for integrated thermo-optical applications

Soave, Paulo Azevedo

doi:10.1117/1.3275452

Cited by 28 publications

(20 citation statements)

References 11 publications

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“…Assuming isotropic expansion (b = 3CTE), the volumetric thermal expansion coefficient for the temperature range considered is 1.7 9 10 -4 K -1 . These values are in accordance with the values found for polymers and hybrids [30,31,[33][34][35][36] and involves a dominant effect in the density change term of the Prod'homme theory for the sol-gel hybrid thin film prepared.…”

Section: Thermo-optic Properties Analysissupporting

confidence: 88%

Thermo-optic properties of hybrid sol–gel thin films doped with Rhodamine 6G at high vacuum conditions

et al. 2015

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An inorganic-organic hybrid thin film doped with Rhodamine 6G prepared by the sol-gel technique has been studied at thermal vacuum conditions by variable angle spectroscopic ellipsometry in order to assess the suitability of using these films in aerospace applications. The thermo-optic properties of the Rhodamine 6G-doped thin film, i.e., the thermo-optic coefficient dn/dT (dependence of the refractive index on temperature) and its linear thermal expansion coefficient a (dependence of the thickness of the film on temperature) were studied in the 343-77 K temperature range obtaining a negative thermooptic coefficient of -5 9 10 -5 K -1 and a linear thermal expansion a of 5.8 9 10 -5 K -1 . The stability of the Rhodamine 6G molecules in the sol-gel matrix was studied at 303, 323, and 343 K at high vacuum (10 -6 mbar) and no significant outgassing or thermal decomposition of the Rhodamine 6G molecules were found, which assures the performance of the hybrid thin films at high vacuum conditions up to the temperature of 343 K. The spectroscopic properties of the Rhodamine 6G molecules showed a dependence on temperature based on a Boltzmann distribution of the vibrational and rotational energy levels that was characterized in the 343-77 K temperature range. We have found that both the hybrid sol-gel thin film and the embedded Rhodamine 6G molecules successfully withstand the extreme temperatures and high vacuum studied, which make these materials promising components for space missions and open new opportunities for the usage of the hybrid sol-gel materials in the aerospace industry.

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Section: Thermo-optic Properties Analysissupporting

confidence: 88%

Thermo-optic properties of hybrid sol–gel thin films doped with Rhodamine 6G at high vacuum conditions

et al. 2015

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“…A solid theoretical basis for determining temperature-dependent optical properties is provided by the linear n ( T ) analysis. However, this is despite the fact that the unified linear analysis of reflection and transmission ellipsometry was developed by Azzam et al 143 already in 1975. The corresponding extension of this linear analysis to temperature-dependent ellipsometry has not yet been reported.…”

Section: Temperature-dependent Ellipsometric Modelingmentioning

confidence: 99%

Temperature-Dependent Spectroscopic Ellipsometry of Thin Polymer Films

2020

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Thin polymer films have found many important applications in organic electronics, such as active layers, protective layers, or antistatic layers. Among the various experimental methods suitable for studying the thermo-optical properties of thin polymer films, temperature-dependent spectroscopic ellipsometry plays a special role as a nondestructive and very sensitive optical technique. In this Review Article, issues related to the physical origin of the dependence of ellipsometric angles on temperature are surveyed. In addition, the Review Article discusses the use of temperature-dependent spectroscopic ellipsometry for studying phase transitions in thin polymer films. The benefits of studying thermal transitions using different cooling/heating speeds are also discussed. Furthermore, it is shown how the analysis and modeling of raw ellipsometric data can be used to determine the thermal properties of thin polymer films.

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“…Such non-linear behavior was noted for the stress higher than about 60 MPa. Yield stress is within the range for the PC material (59-70 MPa [63]), while Young's modulus slightly exceeds its upper range value (2-2.44 GPa [63]). Moreover, the Young's modulus obtained for the 3D PC mPOF is close to the one estimated for the drilled-preform 3-ring PC mPOF in [24] (2.89±0.30 GPa) and [64] (2.70±0.01 GPa).…”

Section: Dynamic Mechanical Analysis Of the Fibermentioning

confidence: 77%

Bragg Gratings Inscribed in Solid-Core Microstructured Single-Mode Polymer Optical Fiber Drawn From a 3D-Printed Polycarbonate Preform

et al. 2020

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and is now heading the Fiber Sensors and Supercontinuum Group. His current research interests include microstructured optical fibers in silica, polymer and soft glasses, fiber optical sensors for sensing biomolecules, pH, oxygen, humidity, stress/strain, in particular using Fibre Bragg gratings, as well as the fabrication and application of supercontinuum sources, in particular in imaging, such as OCT and photoacoustic imaging. He is a Fellow of the Optical Society of America. Beatriz Ortega (was born in Valencia, Spain, in 1972. She received the M.Sc. degree in Physics in 1995 from the Universidad de Valencia, and the Ph.D. in Telecommunications Engineering in 1999 from the Universidad Politécnica de Valencia. Currently working at the Departamento de Comunicaciones from the Universitat Politècnica de València and collaborating as a group leader in the Photonics Research Labs in the Institute of Telecommunications and Multimedia Applications. She has published more than 200 papers and conference contributions in fibre Bragg gratings, microwave photonics and optical networks. She has got several patents and is also a co-founder of EPHOOX company. She has participated in a large number of European Networks of Excellence and R&D projects and other national ones. Her main research is currently focused on optical devices, optical networks and microwave photonic systems and applications. Kyriacos Kalli (C.Phys. MIEEE, SMOSA) received a B.Sc. in theoretical physics (1988) and Ph.D. in physics (1992) from the University of Kent, UK, where he studied linear and non-linear phenomena in optical fibers. He joined Cyprus University of Technology (CUT) in 2008 and is a Professor in the Department of Electrical Engineering, Computer Engineering and Informatics; he is also Director of the Photonics and Optical Sensors Research Laboratory and runs the Femtosecond Laser Foundry. He has 230+ journal and conference publications, is coauthor of "Fiber Bragg Gratings: Fundamentals and Applications in Telecommunications and Sensing. His research interests are in Bragg grating and optical fiber sensors, femtosecond laser micro-fabrication of photonic devices, microfluidics and plasmonics. Dr. Kalli is currently on the Board of Directors of the Cyprus Organization for Standardization.

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Refractive index control in bicomponent polymer films for integrated thermo-optical applications

Cited by 28 publications

References 11 publications

Thermo-optic properties of hybrid sol–gel thin films doped with Rhodamine 6G at high vacuum conditions

Thermo-optic properties of hybrid sol–gel thin films doped with Rhodamine 6G at high vacuum conditions

Temperature-Dependent Spectroscopic Ellipsometry of Thin Polymer Films

Bragg Gratings Inscribed in Solid-Core Microstructured Single-Mode Polymer Optical Fiber Drawn From a 3D-Printed Polycarbonate Preform

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