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18 April 2022 | Story Leonie Bolleurs | Photo Stephen Collett
Prof Ted Kroon
Prof Ted Kroon from the Department of Physics recently delivered his inaugural lecture on the topic What’s the use of a rainbow on the UFS Bloemfontein Campus.

“A rainbow is a natural phenomenon, the result of the refraction and reflection of the sun’s rays in drops of rain. As far as mankind is concerned, it’s a perfectly useless object and won’t make anyone money. Yet the poet who said, My heart leaps up when I behold a rainbow in the sky, only put into word the feeling of wonder and excitement we all have when we see a rainbow.”

“Every day I see a rainbow in my work; I do not need to wait to see one in the sky,” says Prof Ted Kroon, Professor in the Department of Physics at the University of the Free State (UFS), who used this phenomenon to introduce the topic of his inaugural lecture: What’s the use of a rainbow. 

“Far from being only a colourful spectacle with no practical value, rainbows are useful – and lead to useful things,” he believes. 

According to Prof Kroon, one can find examples of real rainbows and rainbow analogies used not only in everyday life, but also in physics. “Besides it being familiar devices in literature, culture, and even marketing, studies of rainbows can yield practical engineering information and may even help us to find new habitable planets,” he says.

Inspired by the many uses of a rainbow

In his lecture, he discussed the basic features of natural rainbows and how they come about. He also explored how the rainbow gives meaning to colour, and how this relates to the temperature of objects. He looked at an array of instances where the rainbow is used; from depicting the life of a star to indicating that we are sick (a thermometer) or when we need to refill a gas cylinder.
Moreover, Prof Kroon pointed out that rainbows are used in computer chips, stress identification, and to transmit internet data through underwater cables of glass fibre. He also referred to how the rainbow was harnessed as an engineering tool to measure refractive index and characterise fine droplet sprays used in industry. 

He continues, “Remarkably, the science developed to understand the natural rainbow can be redirected and applied to the optical properties of metallic nanoparticles, allowing the development of nanotechnology. Knowing how the natural rainbow works and its limitations, better systems have been developed to produce rainbows. Such rainbows have been used to discover new elements and to determine the age of the universe.”

As a member of an international community of phosphor researchers who are privileged to work with rainbows every day, he has used them to study the light-emitting properties of materials doped with bismuth. With this project – an initiative with the African Laser Centre taking place between 2016 and 2021 – he collaborated with the University of Khartoum in Sudan and trained a number of its postgraduate students. “My role included the guidance of students and the measurement and interpretation of the light-emitting properties of the materials. Our research during this time, considering more than a dozen materials, was summarised in 34 scientific publications that contributed to a greater understanding of bismuth ions as light-emitting materials,” he explains. 

Developing new materials, efficient in emitting blue light

He has been developing luminescent materials since 2006, primarily for general lighting (fluorescent tubes and LEDs) and displays (television, computer, and cellphone screens), as well as niche applications in medical and forensic science. 

As part of his current research, he is examining the effect of plasmonic metal nanoparticles on phosphor light emission. He is also exploring materials that absorb infrared light but emit visible light. “For this, I would like to consider the long-term stability of such materials and develop new materials that are more efficient in emitting particularly blue light,” he says. 

Prof Kroon holds a C2 rating from the National Research Foundation and has published more than 150 articles and book chapters, obtaining a Scopus h-index of 26.

News Archive

Postgraduate Film and Visual Media Programme at UFS from 2015
2014-12-04

 

There is great excitement at the University of the Free State (UFS) about the approval of a new honours and master’s programme in Film and Visual Media to be offered at the Faculty of the Humanities as from January 2015.

Prof Suzanne Human, Head of the Department of Art History and Visual Culture Studies at Kovsies and Director of the new programme, says this will be an interdisciplinary Film and Visual Media programme. There will consequently be a strong theoretical-philosophical basis in the training, as well as the practical experiences of students. The UFS will be the only university in South Africa where this much emphasis is placed on the historical and theoretical aspects of film-making.

“The world of images is, in our day and age where we are overwhelmed by images on a daily basis, a central study field relevant across various disciplines and even links the natural and human sciences,” says Prof Human.

“Film, which replaced books in the lives of young people in many ways, is an exciting field of which most people have some knowledge and involves a broad field of information with wide relevance.”

The programme will be presented with the cooperation of international scholars and experienced experts from the local industry. Chris Vorster – better known as Ryno from 7de Laan – with more than 20 years of experience in writing, directing and performance for theatre and TV, was appointed as lecturer in Film-making Theory and Practice in the newly-built film studio as from 2 January 2015.

This new postgraduate programme is developed in cooperation with several UFS departments:
• Prof Suzanne Human and Johanet Kriel (History of Art and Visual Culture Studies);
• Prof Nico Luwes, Dr Pieter Venter and Debeer Cloete (Drama and Theatre Arts);
• Prof Helene Strauss (English);
• Dr Anthea van Jaarsveld and Dr Cilliers van den Berg (Afrikaans and Dutch, German and French).

Specific admission requirements apply. For example, students should have a related BA degree with a minimum achievement level of 65%. Admissions are limited and subject to selection, therefore students that are interested should apply as soon as possible.  

Admission requirements

For more information, please send an email to filmandvisualmedia@ufs.ac.za.

 

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