Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 20 for “"third harmonic generation"”.
-
Third harmonic generation microscopy and applications
Includes bibliographical references (pages 40-41).
-
Third Harmonic Generation as a Probe of Ultrafast Phase Transitions
Also presented are initial efforts to measure the solidification rate of metal samples using linear methods, including the design and operation of a deferential photo detector as well as the first quantitative measurements of the thermal conductance of metal-metal interfaces. The room temperature …
-
Third Harmonic Generation: A Method for Visualizing Myelin in the Murine Cerebral Cortex
<p>Here we present the use of Third Harmonic Generation (THG) for the label-free imaging of myelinated axons in the murine cerebral cortex. Myelin plays an important role in the processes of learning and disease. However, much of the myelin biology research thus far has focused on white matter …
-
The optical cubic susceptibility dispersion of some transparent thin films.
… of this dissertation has been to investigate the third order nonlinear susceptibility dispersion of molecules and polymers in order to estimate their purely electronic nonlinear response and in particular their optical Kerr nonlinear susceptibility in the 1 to 2 μm infrared spectral region. We …
-
Quantum Tunneling of Charge-Density Waves in Quasi-One-Dimensional Conductors (Trichalcogenide, Tantalum Trisulfide, Niobium-Triselenide)
… dc conductivity, ac admittance, direct mixing, harmonic mixing, second harmonic generation, and third harmonic generation as functions of dc bias voltage, applied frequencies, and, in some cases, the amplitude of an additional ac signal. Measurements of the direct and harmonic mixing responses …
-
Geometric manipulation of light : from nonlinear optics to invisibility cloaks
… at frequency w1 to frequency Wk due to second or third harmonic generation or four-wave mixing using coupled-mode theory. Using this framework, we show there is a critical input power at which maximum frequency conversion is possible. We study in depth the case of third harmonic generation, its …
-
Nonlinear optical microscopy and spectroscopy by pulse shaping of a coherent fiber supercontinuum
… visualizes endogenous fluorophores. Second and third harmonic generation microscopy maps optical non-centrosymmetry and heterogeneity. Coherent Raman scattering spectroscopic imaging probes intrinsic molecular vibrations. An integrated platform with combined modalities realizes label-free …
-
Nonlinear microscopy for material characterization
… unstudied aspects of materials. By probing third order nonlinear optical signals determined by the nonlinear susceptibility (chi-3), which is present in all materials, we gain insight not available by conventional linear or electron microscopy. Third-harmonic generation (THG) and four-wave …
-
Waveguide Integrated Optoelectronics Using Two-Dimensional Materials
… of a photodetector. Subsequent observation of third-harmonic generation led to characterization of chi(3) in black phosphorus for the first time.
-
Label-free multi-modal multiphoton imaging for real-time point-of-procedure assessment of needle biopsies
… and three-photon fluorescence, and second and third harmonic generation. Intraoperative NLOI of fresh NB specimens from tumor-bearing animals during veterinary surgeries demonstrated the potential of this system to enable real-time and point-of-procedure histological evaluation of the NB …
-
Study of nonlinear microwave properties of high-temperature superconducting film
… boundaries. The microwave impedance, second- and third-harmonic generation, and the third-order intermodulation distortion of engineeried bicrystal grain boundaries with misorientation angles of [theta] = 2⁰, 5⁰, 7.5⁰, 10⁰, and 24⁰ were measured using a suspended microstrip resonator with …
-
Nonlinear Optical Techniques For Imaging And Manipulating The Mouse Central Nervous System
… In particular, we have demonstrated that third harmonic generation is a dyefree method of imaging CNS myelin, a fundamental constituent of the spinal cord that is difficult to label using exogenous dyes and/or transgenic constructs. Since gaining optical access to the spinal cord is a …
-
Wide-field Polarimetric Second Harmonic Generation Microscopy for Histology Imaging
… several contrast mechanisms including second harmonic generation (SHG), third harmonic generation (THG) and multiphoton excitation fluorescence (MPEF) that can contribute with additional information to hematoxylin and eosin (H&E) stained tissue histopathology, which is used as a gold standard …
-
Έλεγχος της μίξης κυμάτων και της δημιουργίας αργού φωτός υπό συνθήκες ηλεκτρομαγνητικά επαγώμενης διαφάνειας και ενίσχυσης χωρίς αντιστροφή πληθυσμού σε μεταλλικούς ατμούς
… γέννεση της κωνικής τρίτης αρμονικής (conical third harmonic generation-THG) σε μεταλλικούς ατμούς Na και K υπό fsec διέγερση. Στη περίπτωση του Na (μέσο με κανονική διασπορά) βρίσκουμε ότι η χαρακτηριστική δακτυλοειδή δομή του κώνου της τρίτης αρμονικής οφείλεται στήν επίδραση κυρίως του …
-
modeling and application of nonlinear metasurface
… nonlinear metasurfaces. First, we show that the third-harmonic generation (THG) can be drastically enhanced by the nonlinear metasurfaces – film-coupled nanostripes. The large THG enhancement is experimentally and theoretically demonstrated. With numerical simulations, we present methods to …
-
Multi-Photon Spectroscopic Studies of Molecule/Metal Interfaces and Graphene
… scanning microscopy was designed to study third-harmonic generation (THG) from micron- scale graphene crystals on glass substrate. The polarization-, thickness-, and orientation- dependence of THG signals from the graphene were measured and compared to theoretical prediction using the …
-
Multimodal Optical Interfaces Enabled by Multiresonant Plasmonics for Bio-Nanophotonics
… nonlinear optical processes, such as second- and third-harmonic generation (SHG/THG), enabling broadband, label-free sensing and bio-actuation with tunable performance. Beyond sensing, the multiresonant plasmonic interface supports precise nanoscale actuation through femtosecond laser-induced …
-
Energy transfer and localization in molecular crystals
… made of PETN and ammonium nitrate. We discuss third-harmonic generation and polarization-conversion processes in such materials. These observed far-field spectral features of the reflected or transmitted light may serve as an alternative tool for stand-off explosive detection.</p>
-
Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
Surface plasmon – the electromagnetic interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers studied the dependence of plasmon resonance frequency on the size, shape and dielectric environment of the nanoscale …
-
Multiphoton microscopy for stain-free slide-free histopathology
… single-shot label-free autofluorescence-multiharmonic (SLAM) microscopy, a single-excitation source nonlinear imaging platform that uses a custom-designed excitation window at 1110 nm and shaped ultrafast pulses at 10 MHz to enable fast (2-orders-of-magnitude improvement), single-shot, and …