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1.
Advantages and disadvantages of experiments with ultrashort two-color pulses
Matija Stupar, 2020, doktorska disertacija

Opis: Advances in the development of lasers have led to a new class of radiation sources generating coherent, tunable, ultrashort light pulses in the spectral region ranging from infrared to soft X-rays. This includes high-order harmonics generation in gas (HHG), on which relies the CITIUS facility at University of Nova Gorica (Slovenia), and free-electron lasers (FELs), such as the facility FERMI at Elettra-Sincrotrone Trieste (Italy). The distinctive structure of HHG and FEL radiation paved the way to time-resolved experiments, which are performed to investigate events occurring on a short, or very short, temporal scale, from picoseconds to femtoseconds. This work focuses on the advantages and disadvantages of some experimental techniques based on using these novel light sources to investigate the microscopic and/or ultrafast dynamics of matter samples, which have been previously driven out of equilibrium. Advantages rely on the implementation of various applications based on two-color schemes and, more specifically, include the possibility of acquiring two-dimensional frequency maps, measuring electrons’ effective masses, or investigating electronic properties decoupled from the influence of the lattice. Particular focus will be put on experimental methods relying on photoelectric effect and photoelectron spectroscopy. In all experiments, we took advantage of one or more specific properties of HHG and FEL sources, such as controllable chirp, to study laser dressed states in helium, variable polarization, to study electronic properties of iron-based pnictides and ultrashort pulses (< 10 fs) to study the purely electronic dynamics in transition metal dichalcogenides. On the other hand, the study of the interface between a molecule and a topological insulator revealed some intrinsic limitations and physical drawbacks of the technique, such as spurious effects originating from the high power pulses, like multiphoton absorption and the space charge effect, or the reduction of experimental resolution when pushing for shorter and shorter pulse durations. Some disadvantages are also connected to the current state-of-the-art in the field of ultrashort laser systems, where a trade-off needs to be found between repetition rate and laser power. Finally, state-of-the-art experiments based on the ability to generate ultrashort pulses carrying orbital angular momentum in visible, near-infrared as well as extreme UV range will be presented. The use of these pulses opens the door to the investigation of new physical phenomena, such as probing magnetic vortices using extreme ultraviolet light from a free-electron laser or imprinting the spatial distribution of an ultrashort infrared pulse carrying orbital angular momentum onto a photoelectron wave packet.
Najdeno v: ključnih besedah
Ključne besede: ultrafast lasers, two-color experiments, photoemission, high-order harmonic generation, free-electron lasers, hot-electrons dynamics, surface science, pump-probe photoemission, ultraviolet photoemission, orbital angular momentum
Objavljeno: 02.12.2020; Ogledov: 2582; Prenosov: 94
.pdf Polno besedilo (19,78 MB)

2.
Photoactivated processes in optical fibers: generation and conversion mechanisms of twofold coordinated Si and Ge atoms
Nicolas Richard, Stefano De Gironcoli, Antonino Alessi, Sylvain Girard, A. Boukenter, Youcef Ouerdane, Layla Martin-Samos, Luigi Giacomazzi, 2017, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...ODC(II), silica, color centers, first-principles, twofold Si, GLPC...
Ključne besede: ODC(II), silica, color centers, first-principles, twofold Si, GLPC
Objavljeno: 15.10.2018; Ogledov: 2781; Prenosov: 0
.pdf Polno besedilo (1,39 MB)

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Use of color in animation
Maja Grčki, 2022, diplomsko delo

Opis: Color is a powerful tool that helps us set the mood, however, its importance is often left unnoticed while watching any form of media (movies, photography, commercials, books, etc.). Both art theory and human psychology show evidence that color and lighting have a large impact on the perception of the viewer which is why this thesis will focus on exploring what impact color and correct lighting of a scene have on people's minds and how it can be used in animation to convey the correct emotions and enhance the viewer’s experience. Throughout this thesis we will cover topics related to color theory, light and how animation studios work on their films in terms of color and lighting. Each chapter will help understand and learn about different uses of color, such as color psychology and symbolism of colors, color scripts, and lighting, and in the end, a case study to conclude everything mentioned before. To do so, this thesis will take a look at Pixar and Disney and their movies such as Coco (Pixar, 2017), Tangled (Walt Disney, 2010) and Finding Nemo (Pixar, 2003) as well as different color theory studies. We will also use the example of the practical part of the diploma work, animated music video Crystal Clear, to see how the colors were used and what the thought process behind it was.
Najdeno v: ključnih besedah
Ključne besede: Color, Animation, Mood, Psychology, Light, Pixar, Disney, ColorScript
Objavljeno: 22.02.2022; Ogledov: 1301; Prenosov: 76
URL Polno besedilo (0,00 KB)
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