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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

Workplace discrimination and unfair practices explored in new book
2017-09-13

 Description: Denine read more Tags: Denine Smit, Labour law, employee relations, bullying, vulnerability, research, Damain Viviers 

Dr Denine Smit
Photo: Supplied

Two law scholars, Dr Denine Smit and Dr Damian Viviers, from the Faculty of Law at the University of the Free State (UFS) recently launched a book titled Vulnerable Employees, which was inspired by their interest in researching, creating awareness and providing a legal exposition in relation to employees who are vulnerable and experience prejudice and dignity violations in the workplace. These include workplace bullying, appearance-based discrimination, those who are gender fluid or have mental-health conditions.
“Dr Viviers, who is also a former student of mine, and I, have been working together for years and share a common understanding in relation to our various topics of interest. We often share the same train of thought. This is how we came to work together to produce this book,” said Dr Smit.


Research focused on employee challenges in the workplace

The book expands on the field of knowledge regarding certain categories of employees who, as a consequence of various mutable, immutable and semi-immutable characteristics, as well as behavioural experiences, are rendered vulnerable in their employment relationships. The book draws on various social, psychological and other empirical considerations, as well as comparative legal research from foreign and international law, in order to expand on the legal position under the South African legal framework governing these conditions. While the book first and foremost constitutes a compendium of research to be used for this purpose, it also serves as a practical guide for all legal practitioners, human resources managers, other labour stakeholders and the judiciary.

Book draws strength in other academic fields
Vulnerable Employees was launched on 28 July 2017 at the UFS library, to an audience of academics and students, with a panel discussion made up of the authors and two other panellists. One of the panellists was Dr Katinka Botha, a leading psychiatrist in the Free State who has a wealth of experience in this field. “Her selection as a panellist was motivated by the various significant inter-disciplinary considerations and intersections between psychology, psychiatry and law, contained in the book,” said Dr Smit. 
“Dr Botha’s expertise was invaluable in shedding light on mental-health considerations during the panel discussion.” 
Mr Lesley Mokgoro, the other panellist, is a leading labour law practitioner, as well as director and head of the Dispute Resolution Practice Group at Phatshoane Henney Attorneys. “His years of experience working with all role players in the employment domain, as well as his extensive legal knowledge and expertise, made him uniquely qualified to serve on the panel and deliver an opinion of the practical and academic value of the book,” said Dr Smit.


Workplace policies key to securing employee rights

There are a number of growing trends in the workplace that could shape the practice of labour law or workplace policies. Dr Smit said the need for employers to regulate workplace culture, particularly in relation to bullying, harassment and unfair discrimination, in line with the South African legal framework, was a fundamental need in all workplaces. Effective workplace policies may be used to clearly outline the relevant “dos and don’ts” to employees, as well as the procedures and processes that may be followed in order to address such conduct. Workplace policies serve to advance legal certainty and efficiency, since the rights and obligations of all role players are clearly demarcated, or should be, in terms of a well-drafted and considered policy. 
The book is one of several publications produced by Dr Smit in collaboration with Dr Viviers on the topic of workplace discrimination and the law. The two scholars are working on another book to be published at the end of 2017.

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