News and events - Tampere University of Technology

Cost- and time-efficient methods for nanostructuring

Nanostructures offer added functionalities for materials and surfaces, enabling processes such as colouring and dirt repellence application. In his dissertation, MSc (Tech) Chunlei Tan created nanostructures that can be used for subwavelength focusing.

Many methods are applied for nanofabrication, and the selection of method is based on the requirements of the desired nanostructures. The typical requirements are sufficient resolution, low costs and time efficiency.

“With nanostructures, it is possible to execute visual phenomena, such as coloured surfaces, diffraction patterns, enhanced scattering and improved optical absorbance. The resulting nanostructures can also exhibit increased surface area as well as dirt and moisture repellence,” Chunlei Tan explains.

In his dissertation, MSc (Tech) Chunlei Tan examined the designing and manufacture of periodical structures. The nanostructuring was based on the interaction of several high-intensity laser beams. The interference pattern of these beams can be quickly and directly imprinted in target materials without chemicals or additional treatments.

In his research, Tan carried out a theoretical study of possible patterns to demonstrate the capacity of a laser interference-based nanofabrication method.

“In practice, the predicted nanopatterns were implemented using two different methods. Potential applications for these fabrication techniques and structures include light trapping in solar cells, photocatalysis and optical sensor surfaces,” Tan concludes.

Public defence of a doctoral dissertation on Friday, 2 December

MSc (Tech) Chunlei Tan’s doctoral dissertation in the field of physics entitled ‘Nanofabrication by direct writing with four-beam laser interference and nanoimprint lithography’ will be publicly examined at the Faculty of Natural Sciences of Tampere University of Technology (TUT) in Auditorium S2 in the Sähkötalo Building (address: Korkeakoulunkatu 1, Tampere, Finland) at 12 noon on 2 December 2016.

The opponent will be University Lecturer Jussi Toppari (University of Jyväskylä). Associate Professor Tapio Niemi from the Optoelectronics Research Centre at TUT will act as Chairman.

Chunlei Tan comes from Jiangsu, China, and he has worked as a researcher at the Optoelectronics Research Centre of TUT.

Further information: Chunlei Tan, tel. +358 (0) 45 113 6428,

News submitted by: Tiina Leivo
Keywords: education and studies, science and research, nanostructures