Modelling and simulation of laser induced periodic surface structuring

Download

1937614_MSc_Thesis.pdf

Date

2023-1-24

Author

Yayla, Mahmut Sinan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

108
views

83
downloads

In recent years, the interest in laser-induced periodic surface structuring (LIPSS) is increased due to its flexibility and cost efficiency. It is a promising alternative to the conventional ways of surface micro and nano structuring. Although, there are generally accepted and supported theoretical studies in the field, the phenomenon lacks a complete model. This thesis study presensts a theoretical model based on scattering from surface nonuniformities, and includes thermochemical interactions on the surface of the material to create the grooves. This model is implemented in a simulation software that takes material, laser and scanning parameters and finds out the resulting surface structure. The simulation software is used to observe normal LIPSS on the surface of Ti and validated by normal LIPSS results. It predicts the existence of various more types of LIPSS, specifically hexagonal LIPSS, using a single scan with linearly polarized light, as demonstrated experimentally in this work. The parameters obtained in the simlation are used in fabrication to obtain hexagonal LIPSS. The desired surface structures are obtained on Ti surfaces.

Subject Keywords

LIPSS, Surface structuring, Laser micro-nano fabrication

URI

https://hdl.handle.net/11511/102031

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Multilayer graphene growth on polar dielectric substrates using chemical vapour deposition KARAMAT, SHUMAİLA; Celik, K.; Zaman, S. Shah; Oral, Ahmet (Elsevier BV, 2018-06-01) High quality of graphene is necessary for its applications at industrial scale production. The most convenient way is its direct growth on dielectrics which avoid the transfer route of graphene from metal to dielectric substrate usually followed by graphene community. The choice of a suitable dielectric for the gate material which can replace silicon dioxide (SiO2) is in high demand. Various properties like permittivity, thermodynamic stability, film morphology, interface quality, bandgap and band alignment...
Application of Electric Resistance Heating Method on Titanium Hot Forming at Industrial Scale Ozturk, Fahrettin; Ece, Remzi Ecmel; Polat, Naki; Koksal, Arif; Evis, Zafer; Sheikh-Ahmad, Jamal Y. (Springer Science and Business Media LLC, 2016-11-01) In this study, hot forming of DIN WL 3.7024 commercially pure titanium with a sheet thickness of 0.6 mm was performed by electric resistance heating. The sheet materials were heated at 600, 650, and 680 A degrees C and then hot formed with an industrial press. Grain size measurement and XRD analysis were performed for each forming temperature in order to investigate microstructure and phase changes. Results indicate that no microstructural changes have occurred at the mentioned temperature range. It was con...
IMPLEMENTATION OF STRONG LIGHT-MATTER INTERACTION FOR FABRICATION AND LIGHT MANAGEMENT OF THIN CRYSTAL SILICON SOLAR CELLS Zolfaghari Borra, Mona; Bek, Alpan; Ünalan, Hüsnü Emrah; Department of Micro and Nanotechnology (2021-7-29) The integration of photonic components with electrical elements on the same silicon chip may lead to the development of new technologies. One limitation is the space available on the wafer surface, which is restricted. Currently, conventional fabrication techniques produce devices only on the top thin layer of the wafer surface. As a result, new architectural designs are required. Producing functional components deep inside Si without creating damage to the surfaces is a potential technique for overcoming t...
Numerical modeling of short term morphological changes around coastal structures and at the river mouths Demirci, Ebru; Baykal, Cüneyt; Güler, Işıkhan; Department of Civil Engineering (2016) In this study, XBeach, a two dimensional depth averaged numerical model developed mainly for simulating nearshore hydro- and morphodynamics is applied to two case studies; i) laboratory experiments on short-term morphological changes around a detached breakwater and a T-groin and ii) a fluvial dominated coastal flooding event at the Manavgat river mouth between dates, 4th and 15th December, 1998. In the first part of study, the numerical model is calibrated for the wave, current and bottom evolution conditi...
Nanowire decorated, ultra-thin, single crystalline silicon for photovoltaic devices AURANG, Pantea; Turan, Raşit; Ünalan, Hüsnü Emrah (IOP Publishing, 2017-10-06) Reducing silicon ( Si) wafer thickness in the photovoltaic industry has always been demanded for lowering the overall cost. Further benefits such as short collection lengths and improved open circuit voltages can also be achieved by Si thickness reduction. However, the problem with thin films is poor light absorption. One way to decrease optical losses in photovoltaic devices is to minimize the front side reflection. This approach can be applied to front contacted ultra-thin crystalline Si solar cells to in...

Citation Formats

M. S. Yayla, “Modelling and simulation of laser induced periodic surface structuring,” M.S. - Master of Science, Middle East Technical University, 2023.