The need for advanced materials and systems with new functionalities has motivated the development of micro/nanostructures on solid surfaces, which are necessary for the fabrication of functional devices for novel applications. In this talk, we will discuss the development of functional micro/nanostructures, based on laser-processed surfaces.

Coating micro/nanostructures with thin metallic films results in plasmonic substrates with enhanced electromagnetic response across the entire visible range, which are used for plasmonic optical trapping [1]. Combining silicon micro/nanostructures with thin semiconducting films results in electronic heterojunctions with increased surface area for improved optoelectronic performance [2]. Furthermore, isotype heterojunctions result in wavelength-selective, high-speed photodetectors with self-powered operation, which can be further engineered by careful selection of the electronic properties of the constituting materials [3,4]. “Smart” surfaces of controllable extreme wetting states are obtained by combining photoresponsive metal oxides with laser-processed micro/nanostructured substrates, which can reach complete water repellence without chemical modification [5]. Also, surfaces with controlled topography, either at the micro- or at the nano-scale, for targeted cell cultures for biomedical applications [6]. We will present recent advances in these fields and discuss future applications.

References

1. D.G. Kotsifaki, M. Kandyla, and P.G. Lagoudakis, Plasmon enhanced optical tweezers with gold-coated black silicon, Scientific Reports 6, 26275 (2016).
2. G. Chatzigiannakis, A. Jaros, R. Leturcq, J. Jungclaus, T. Voss, S. Gardelis, and M. Kandyla, Laser-microstructured ZnO/p-Si photodetector with enhanced and broadband responsivity across the ultraviolet-visible-near-infrared range, ACS Applied Electronic Materials 2, 2819 (2020).
3. G. Chatzigiannakis, A. Jaros, R. Leturcq, J. Jungclaus, T. Voss, S. Gardelis, and M. Kandyla, Broadband wavelength-selective isotype heterojunction n+-ZnO/n-Si photodetector with variable polarity, Journal of Alloys and Compounds 903, 163836 (2022).
4. M.D. Tsanakas, A. Jaros, Y. Fleming, M. Efthimiadou, T. Voss, R. Leturcq, S. Gardelis, and M. Kandyla, Wavelength-selective, high-speed, self-powered isotype heterojunction n+-ZnO/n-Si photodetector with engineered and tunable spectral response, Advanced Materials Technologies 10, 2401740 (2025).
5. M. Kanidi, A. Bardakas, A. Kerasidou, A. Anastasopoulos, C. Tsamis, and M. Kandyla, Hierarchical ‘rose-petal’ ZnO/Si surfaces with reversible wettability reaching complete water repellence without chemical modification, Applied Physics A 129, 320 (2023).
6. M. Kanidi, A. Papadimitropoulou, C. Charalampous, Z. Chakim, G. Tsekenis, A. Sinani, C. Riziotis, and M. Kandyla, Regulating MDA-MB-231 breast cancer cell adhesion on laser-patterned surfaces with micro- and nanotopography, Biointerphases 17, 021002 (2022).