Browsing Institutt for fysikk by Title
Now showing items 2674-2693 of 2794
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An ultra-low field SQUID magnetometer for measuring antiferromagnetic and weakly remanent magnetic materials at low temperatures
(Journal article, 2023)A novel setup for measuring magnetic fields of antiferromagnets (i.e., quadrupolar or higher-order magnetic fields) and generally weakly remanent magnetic materials is presented. The setup features a highly sensitive ... -
Ultra-short pulsed Tm- and Er-doped all-fiber MOPA lasers and supercontinuum sources.
(Doctoral thesis, 2016-12-12)The present work describes the results of the development of a family of novel diode-pumped ultra-short and short pulsed Er- and Tm-fiber laser systems in the “eye-safe” near- and mid-Infrared (mid-IR) wavelength range for ... -
Ultrabroad Continuous-Wave Tuning of Ceramic Cr:ZnSe and Cr:ZnS Lasers
(Chapter, 2010)Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth. -
Ultrafast control of spin interactions in honeycomb antiferromagnetic insulators
(Journal article; Peer reviewed, 2019)Light enables the ultrafast, direct, and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling ... -
Ultrafast fiber-based lasers beyond 2 µm
(Chapter, 2017)The talk reviews recent advances in fiber based ultrafast mid-IR lasers and frequency combs, outlines the trends in materials as well as novel approaches for generation of ultra-broadband spectra above 2 mm. -
Ultrafast generation and dynamics of isolated skyrmions in antiferromagnetic insulators
(Peer reviewed; Journal article, 2019)Based on atomistic spin dynamics simulations, we report the ultrafast generation of single antiferromagnetic (AFM) skyrmions in a confined geometry. This process is achieved through an effective magnetic field induced by ... -
Ultrafast Laser Direct Writing as a key enabling technology for silicon processing: a new target for positronium Bose-Einstein condensation and performance improvements of the MALTA2 tracking sensor
(Master thesis, 2024)I det nåværende arbeidet viser vi to anvendelser av en laserbearbeidingsteknikk kalt Ultrafast Laser Direct Writing (ULDW). Endringer i bulk kan induseres i en krystallinsk halvleder for å kontrollere dens faste tilstand ... -
Ultrafast magnon-phonon dynamics
(Master thesis, 2022)Kontroll av magnetisme ved bruk av ultraraske laserpulser har tiltrukket seg mye oppmerksomhet de siste tiårene. Dette har resultert i intensiv forskning, både teoretisk og eksperimentell, for å forstå de mikroskopiske ... -
Ultrafast manipulation of Heisenberg exchange and Dzyaloshinskii–Moriya interactions in antiferromagnetic insulators
(Master thesis, 2019)Light enables ultrafast, direct and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling and in ... -
Ultrafast Microscopy Imaging of Acoustic Cluster Therapy Bubbles: Activation and Oscillation
(Peer reviewed; Journal article, 2022)Acoustic Cluster Therapy (ACT®) is a platform for improving drug delivery and has had promising pre-clinical results. A clinical trial is ongoing. ACT® is based on microclusters of microbubbles–microdroplets that, when ... -
Ultrafast nonlocal collective dynamics of Kane plasmon-polaritons in a narrow-gap semiconductor
(Journal article; Peer reviewed, 2019)The observation of ultrarelativistic fermions in condensed-matter systems has uncovered a cornucopia of novel phenomenology as well as a potential for effective ultrafast light engineering of new states of matter. While ... -
Ultrafast Two-Magnon Excitation in Two-Dimensional Antiferromagnetic Insulators
(Master thesis, 2020)Spinneksitasjoner i todimensjonale antiferromagnetiske materialer manifesteres som spinnbølger som også er kjent som magnoner. Magnoner er bosoniske kvasipartikler som kan eksiteres ved hjelp av en laserindusert forstyrrelse ... -
Ultrahigh-pressure form of Si O2 glass with dense pyrite-type crystalline homology
(Peer reviewed; Journal article, 2019)High-pressure synthesis of denser glass has been a longstanding interest in condensed-matter physics and materials science because of its potentially broad industrial application. Nevertheless, understanding its nature ... -
Ultrasound and magnetic resonance imaging for group stratification and treatment monitoring in the transgenic adenocarcinoma of the mouse prostate model
(Journal article; Peer reviewed, 2020)Background:The transgenic adenocarcinoma of the mouse prostate (TRAMP) is a widelyused genetically engineered spontaneous prostate cancer model. However, both thedegree of malignancy and time of cancer onset vary. While ... -
Ultrasound and microbubble treatment for improved delivery of nanomedicine to tumours and the brain
(Doctoral theses at NTNU;2021:138, Doctoral thesis, 2021)The combined use of ultrasound and intravascular microbubbles, referred to as ultrasound and microbubble treatment, has emerged as a promising technique to enhance delivery of nanomedicine to tumours and the brain. Even ... -
Ultrasound and Microbubbles Increase the Uptake of Platinum in Murine Orthotopic Pancreatic Tumors
(Peer reviewed; Journal article, 2023)Objective Currently available cytotoxic treatments have limited effect on pancreatic ductal adenocarcinoma (PDAC) because desmoplastic stroma limits drug delivery. Efforts have been made to overcome these barriers by drug ... -
Ultrasound and microbubbles to beat barriers in tumors: Improving delivery of nanomedicine
(Peer reviewed; Journal article, 2021)Successful delivery of drugs and nanomedicine to tumors requires a functional vascular network, extravasation across the capillary wall, penetration through the extracellular matrix, and cellular uptake. Nanomedicine has ... -
Ultrasound Beamforming based on Deep Learning
(Master thesis, 2020)Stråleforming blir brukt av enheter som tar opp eller sender signaler med flere enn én kanaler for å gi sterkere signalstyrke i en gitt retning. Innen ultralyd kan bedre algoritmer for stråleforming gi økt bildekvalitet, ... -
Ultrasound enhanced diffusion in hydrogels: An experimental and non-equilibrium molecular dynamics study
(Journal article; Peer reviewed, 2024)Focused ultrasound has experimentally been found to enhance the diffusion of nanoparticles; our aim with this work is to study this effect closer using both experiments and non-equilibrium molecular dynamics. Measurements ... -
Ultrasound for the delivery of a nanocarrier across biological barriers in tumors: impact of cavitation and acoustic radiation force
(Doctoral theses at NTNU;2020:56, Doctoral thesis, 2020)Ultrasound for the delivery of a nanocarrier across biological barriers in tumors: impact of cavitation and acoustic radiation force Although conventional chemotherapy is the still one of the most important treatment ...