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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"LiNbO3"”.
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DIRECT VOLTAGE MEASUREMENTS USING BULK ACOUSTIC WAVES IN LiNbO3
… bulk acoustic wave sensor using lithium niobate (LiNbO3) that has applications to metrology, research, and power metering was developed to overcome these measurement issues with the factors of scalability, ease of use, and compactness in mind. A Y+36° cut LiNbO3crystal was coupled to two acoustic …
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Acoustic, microwave, and photonic devices in thin film LiNbO3
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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High quality integrated LiNbO3 acousto-optic platform for visible light spectrum
… of acousto-optic platforms (AlN, GaN, Quartz, LiNbO3) for many practical applications such as beam steering, signal processing, and intensity modulation. The recent integration of on-chip acousto-optic devices with photonic integrated circuits lead to many different acousto-optic devices such …
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Φωτοεπαγόµενες παραµορφώσεις σε κρυστάλλους LiNbO3 µε προσµίξεις σιδήρου. In situ µελέτη µε συνδυασµό τοπογραφίας σύγχροτρον και περιθλασιµετ...
… σε οπτοηλεκτρονικές διατάξεις. Φωτισµός του LiNbO3 µε ορατή ακτινοβολία έχει ως αποτέλεσµα την ανάπτυξη ισχυρού ηλεκτρικού πεδίου φορτίων χώρου κατά µήκος του άξονα πόλωσης c στον όγκο του υλικού (φωτοβολταϊκό φαινόµενο όγκου). Με τη συνδυαστική χρήση των πλέον σύγχρονων µεθόδων …
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FABRICATION METHODOLOGIES FOR INTEGRATED PHOTONIC DEVICES IN LITHIUM NIOBATE
… devices. However, the fabrication of advanced LiNbO3 devices like suspended membrane is still quit challenging, limiting the development of integrated optics. The overall aim of this study was to explore the fabrication methods and attempt to develop novel devices based on deep anisotropic …
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Design, fabrication, and characterization of lithium niobate whispering-gallery-mode microdisk and microring resonators and grating couplers
Lithium niobate (LiNbO3) is becoming popular in microelectronics and photonics research due to its exciting physical properties. Properties such as large electro-optic and piezoelectric coefficients make lithium niobate an excellent material for RF-photonics platforms that require center frequency …
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Advancing acoustic filters for 5G front-ends: Lithium niobate piezoelectric MEMS resonators and filters
… mode in the Z-cut and Y-cut lithium niobate (LiNbO3) thin films. The fabricated devices based on Z-cut LiNbO3 demonstrated an electromechanical coupling (kt2) of 30%, which is more than three times of current commercial solutions. The fabricated devices based on Y-cut LiNbO3 demonstrated a …
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Processing and characterization of lithium niobate thin films for ferroelectric nonvolatile memory applications
Both highly c-axis and randomly-oriented LiNbO3 thin films are grown on p-type Si (111) substrates by RF magnetron sputtering and metallo-organic decomposition (MOD), respectively. Ellipsometry, X-ray diffraction, AFM and SEM are used to analyze the structural quality of the deposited ferroelectric …
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Electrical characterizations of lithium niobate thin films in a metal-ferroelectric-semiconductor capacitor
A LiNbO3 thin film Metal-Ferroelectric-Semiconductor capacitor is analyzed with various electrical characterization methods for studying the polarization switching and the thin film conduction behavior. The polarization density vs. electric field (P-E) curve shows that the remnant polarization is …
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Super-high-frequency lithium niobate microelectromechanical system resonators
… ion-sliced and suspended Z-cut lithium niobate (LiNbO3) thin films, which feature a phase velocity exceeding 10,000 m/s. The fabricated device has demonstrated a high electromechanical coupling (kt2) of 29% and a high quality factor (Q) of 527 simultaneously. Hence, this work marks the first time …
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Lithium niobate RF-MEMS oscillators for IoT, 5G and beyond
… design and implementation of lithium niobate (LiNbO3) radiofrequency microelectromechanical (RF-MEMS) oscillators for internet-of-things (IoT), 5G and beyond. The dissertation focuses on solving two main problems found nowadays in most of the published works: the narrow tuning range and the low …
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Investigating the Thermal Stability and Cation Ordering in Layered Cathode LixMO2 (x ≤ 1; M = Co, Mn, Ni) Materials for Li-ion Rechargeable Batteries and Studying the Ferroelectric Properties of LiNbO3 Nanoparticles
… materials in the rechargeable battery, and LiNbO3, has wide application in ferroelectric devices such as electronics, non-volatile memories, and thin film capacitors. LiMO2 was synthesized and characterized to understand the correlation between capacity fading and thermal stability relating …
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RF micro-systems for 5G front-end signal processing
… advances in materials, design, and fabrication, LiNbO3 thin-film has been proved as a promising low-loss, wideband, and frequency-diverse acoustic platform for novel functions toward high-performance 5G front-end signal processing. Based on acoustic devices in LiNbO3 thin films, this thesis aims …
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Electro-Optic Properties of Self-Assembled Non-Linear Optical Polymers
… determined to be on the order that of LiNbO3. The self-assembled samples are shown to have an enhanced polar order compared to that of more traditional poled polymers. Furthermore, this polar order is intrinsic and thus doesn't require electric field poling and does not decay with time. …
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Enhanced condensation with active methods
… patterns were fabricated on piezoelectric LiNbO3 wafers and SAW waves were generated with RF voltages in the 12.5 - 100 MHz regime. These were tested in the in-house condensation rig with Ethanol, Pentane, Hexane and Perfluorohexane. Heat transfer coefficients showed more than 2X …
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Lithium niobate thin films on diamond substrates for SAW devices
… fast Fourier transformation. SAW activities for LiNbO3/diamond/silicon structure are observed. Discussions about the results and further improvements are presented.
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Development of phonon-polarization THz spectroscopy, and the investigation of relaxor ferroelectrics
… generated in an ionic crystal (typically LiNbO3 or LiTaO3) via impulsive stimulated Raman scattering as a THz source for spectroscopy: (1) the versatility of phonon-polariton waveform shaping and detection, (2) the ability to use the ionic crystal as a compact, integrated spectroscopic …
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Characterization of Linear Electro-Optic Effect of Poled Organic Thin Films
… beam optics and the suitability of a thick z-cut LiNbO3 crystal as a reference to validate the Teng-Man measurement. Simply taking the metal electrode off the Teng-Man sample makes it feasible to use the ATR method using a metal-coated prism. This technique has the capability of measuring …
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
Lithium Niobate (LiNbO3) is a piezoelectric material that also exhibits promising optical characteristics such as low optical loss and high electro-optic coefficient, making it an interesting choice for Radio Frequency (RF) micro-opto-electro-mechanical systems (MOEMS) and devices, electro-optical …
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The generation of high field terahertz radiation and its application in terahertz nonlinear spectroscopy
… pulse generation via optical rectification in a LiNbO3 (LN) crystal. I also developed a method for the non reconfigurable generation of high-intensity multiple-cycle THz fields aimed to more efficiently deliver THz energy to resonant samples. A novel free-space THz-pump/THz-probe setup enabled …
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