Dr. Zoltan Vilagosh Profile

Dr. Zoltan Vilagosh

Adjunct Research Fellow

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Publications (7)

Proceedings Article | 7 March 2022 Presentation + Paper

Estimating dielectric parameters by reflecting evanescent waves at THz frequencies

Zoltan Vilagosh, Negin Foroughimehr, Alireza Lajevardipour, Dominique Appadoo, Saulius Juodkazis, Andrew Wood

Proceedings Volume 12000, 120000L (2022) https://doi.org/10.1117/12.2609533

KEYWORDS: Terahertz radiation, Mirrors, Reflectivity, Reflection, Refractive index, Dielectrics, Synchrotrons, Bioalcohols

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Proceedings Article | 27 October 2021 Paper

Estimating the dielectric parameters of water and gel using reflectance and transmission at 1.85 to 2.07 THz

Zoltan Vilagosh, Negin Foroughimehr, Alireza Lajevardipour , Dominique Appadoo, Saulius Juodkazis, Andrew Wood

Proceedings Volume 11925, 119250B (2021) https://doi.org/10.1117/12.2615416

KEYWORDS: Reflectivity, Water, Terahertz radiation, Crystals, Mirrors, Dielectrics, Statistical analysis, Diamond, Absorption, Reflection

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Proceedings Article | 31 December 2019 Paper

Measuring absorption coefficient of excised animal skin exposed to THz radiation

Alireza Lajevardipour, Zoltan Vilagosh, Andrew Wood

Proceedings Volume 11201, 112011W (2019) https://doi.org/10.1117/12.2539879

KEYWORDS: Skin, Terahertz radiation, Absorption, Synchrotrons, FT-IR spectroscopy, Spectroscopy, Transmittance, Refractive index, Interfaces, Water

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Proceedings Article | 30 December 2019 Paper

Exploring the temperature dependent dielectric properties of adipose tissue in the THz range

Zoltan Vilagosh, Alireza Lajevardipour, Andrew Wood

Proceedings Volume 11202, 112021G (2019) https://doi.org/10.1117/12.2539856

KEYWORDS: Terahertz radiation, Tissues, Absorption, Dielectrics, Skin, Synchrotrons, Liquids, Water, Electromagnetism, Breast cancer

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Terahertz (THz) frequency region of the electromagnetic spectrum is defined as radiation of 0.1 to 10.0 x 10¹² Hz (corresponding to wavelengths of 3.0 mm to 0.03 mm). Water in the liquid state has a very high absorption coefficient in the lower THz region¹ (80-350 cm^-1 at 0.1-2.0 THz), with ~90% of the energy being absorbed in the first 0.10 mm at 0.6- 0.9 THz at 35⁰ C. The THz absorption coefficient of ice, on the other hand is only in the order of 1.0 -7.0 cm^-1 in the same range². This, two orders of magnitude difference between the THz absorption of ice and liquid water is a unique feature of the 0.1-2.0 THz range. The water content of most normal tissue, including the dermis and the deeper layers of the epidermis is in the order of 70-73%. The water content of body adipose tissue (fat) is about 20% adults³, thus, freezing the water content in tissues will have a significant influence on THz absorption properties even in adipose tissue. The properties of other, non-water, non-fat components of adipose tissue will also have an influence. The potential for medical imaging or therapeutic intervention at body, room or freezing temperature becomes dependent, in part, on the behavior of the dielectric properties non-water elements of living tissues. These elements have a much lower absorption coefficient, generally in the order of 10-20 cm^-1, and do not change on freezing to the same extent as water^4,5. The preliminary exploration of the concept of the viability of the THz-skin freezing imaging technique in skin was undertaken using computational modelling6. The depth of the dermis in humans is in the range of 2 to 5 mm and thus freezing the skin for examination may involve subcutaneous adipose. It follows that before any advance can be made the temperature dependent properties of adipose tissue need to be understood. One poorly understood aspect is the presence of a phase change in the adipose tissue, analogous to the one observed with butter becoming soft at room temperature, after being firm at refrigerator temperatures (4⁰ C). The attenuated total reflection (ATR) apparatus at the Australian synchrotron provides for a rapid acquisition of data in a temperature controlled environment, with individual sets of readings taking in the order of 1-3 minutes. This provides an appropriate environment for the study of the changes in absorption coefficients in the samples, and to ascertain the utility of ATR for diagnostic applications.

Proceedings Article | 1 March 2019 Paper

Multiband terahertz imaging simulation of skin using freezing to enhance penetration depth

Zoltan Vilagosh, Alireza Lajevardipour, Andrew Wood

Proceedings Volume 10948, 109483S (2019) https://doi.org/10.1117/12.2512342

KEYWORDS: Terahertz radiation, Skin, Water, Absorption, Tissues, Picosecond phenomena, Sensors, Reflection, Electric field sensors, Millimeter wave imaging

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Proceedings Article | 26 February 2019 Presentation + Paper

Imaging and lesion ablation modeling in skin using freezing to enhance penetration depth of terahertz radiation

Zoltan Vilagosh, Alireza Lajevardipour, Andrew Wood

Proceedings Volume 10851, 108510E (2019) https://doi.org/10.1117/12.2506659

KEYWORDS: Terahertz radiation, Skin, Tissues, Absorption, Water

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Proceedings Article | 2 January 2018 Paper

Modelling terahertz radiation absorption and reflection with computational phantoms of skin and associated appendages

Zoltan Vilagosh, Alireza Lajevardipour, Andrew Wood

Proceedings Volume 10456, 104560M (2018) https://doi.org/10.1117/12.2283206

KEYWORDS: Terahertz radiation, Skin, Absorption, Dielectrics, Water, Modeling, Radiation effects, Magnesium, Sensors, Finite-difference time-domain method

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Showing 5 of 7 publications

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