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 23 for “"thermo-optic"”.
-
Passive and Thermo-Optic Characterization of Long-Range Surface Plasmon-Polariton Structures in CYTOP
… of their fabrication quality is necessary. In thermo-optic measurements, electric currents were injected heating the waveguides and changing the refractive index of the claddings. Electromigration were characterized and the conclusion was that the waveguides can work under the current density …
-
Thermo-optic Phase Spectroscopy techniques for multiscale thermal conductance characterization in semiconductor integrated circuits
… applications. This thesis introduces Thermo-optic Phase Spectroscopy (TOPS), a family of non-destructive techniques for multiscale thermal conductance characterization across bulk materials, buried films and interfaces, and nanoscale films. Three variants are developed: Displacement …
-
Determination of thermo-optic coefficient for B2O3 and GeO2 co-doped optical silica fiber
… understand the influence of B2O3 and GeO2 on the thermo-optic coefficient (TOC) of silica optical fiber. This is important since understanding the contributions to the TOC by these constituents can provide insight into the way to lower the positive-valued TOC of SiO2, which is a potential method …
-
Design of a CMOS compatible, athermal, optical waveguide
… possible design for a CMOS compatible, athermal, optical waveguide. The design explored is a slot waveguide with light guided in the low index material. A design paradigm is proposed which shows the relationship between cross-sectional parameters and their impact on both the effective index of …
-
Multi-layer, Low-crosstalk Integrated Optical Switches
… and data-intensive applications necessitates optical switching technologies with ultra-low crosstalk, high bandwidth, and nanosecond-scale reconfigurability. This work presents a comprehensive study of 3D Si-SiN-SiN tri-layer optical switches employing switch-and-select (S&S) architectures for …
-
Optical signal generation, stabilization, and manipulation in broadband silicon photonics
… issues are addressed by investigating the thermo-optic characteristics of various CMOS-compatible media. Negative thermo-optic coefficient of titanium dioxide is utilized to compensate for the all-positive thermal index shifts in the Si/SiN waveguide platform. An athermal resonator with …
-
The design and application of polymeric materials in a novel light modulated accelerometer.
… the development of the accelerometer the stress-optic and thermo-optic coefficients have been determined for a range of polymeric materials.The stress optic coefficient was determined for polycarbonate, polymethyl methacrylate, polvinyl chloride and araldite epoxy resin using a circular …
-
Towards Monolithically Integrated Optical Systems for Communication and Sensing
… platform is developed to address the limited thermo-optic tunability of SiN. By overlaying an amorphous silicon (α-Si) layer on SiN waveguides, the hybrid design enhances thermo-optic modulation efficiency while retaining the low-loss characteristics of SiN. Simulations predict robust …
-
Adsorption of molecular layers on hydrophilic SiOxNy probed by DPI technique
… perturbations. That raised the importance of thermo-optic effects in such a configuration since they get mixed with adsorption effects within the results. Also an asymmetrical beam expander has been designed in order to improve the optical setup of the instrument.
-
The study of acoustic properties of P205-doped silica fiber
Silica-based optical fibers have been applied to numerous fields. The interactions between acoustic phonons and the optical wave are involved in several of these applications. A significant stimulated scattering mechanism observed is stimulated Brillouin scattering (SBS), resulting in strong …
-
Lightwave circuits for integrated Silicon Photonics
… is chosen to integrate all the components of an optical bench necessary for a quantum experiment into a single chip. The problem of generating photon pairs have been addressed by studying second order polarisation effects in strained silicon with the aim to realize a bright photon pairs source …
-
Simultaneous measurement of strain and temperature using liquid core optical fiber sensors
… core fiber sensor is comprised of a hollow core optical fiber filled with a liquid of a known index of refraction which is slightly higher than that of the silica tube which acts as the cladding. The refractive index fluid is chosen such that the variation of its refractive index with strain and …
-
Bragg grating filters for optical networks
… on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an erbium-doped …
-
The synergistic role of light and heat in liquid-based nanoparticle manipulation
… of nanoparticles and biomolecules. When optical effects dominate over thermal effects, the motion of nanoparticles can be controlled by optical forces. Here, we study the motion of 100 nm gold particles within a 1D optical potential, created by interfering counterpropagating beams. …
-
Athermal photonic devices and circuits on a silicon platform
In recent years, silicon based optical interconnects has been pursued as an eective solution that can offer cost, energy, distance and bandwidth density improvements over copper. Monolithic integration of optics and electronics has been enabled by silicon photonic devices that can be fabricated …
-
Germanium on Silicon Integrated Photonics for the Mid-Wave Infrared
… applies nanofabrication approaches with optical materials in order to miniaturize and improve the robustness of optical systems. Most integrated photonics development occurs in the near-infrared for telecommunications applications, but there is increasing interest in expanding the …
-
Improvement of the Optical and Mechanical Properties of Silica Nanoparticle Ionic Self-Assembled Multilayer Anti-Reflection Coatings on Glass and Polycarbonate Substrates
This thesis presents the characterization of the optical and mechanical properties of silica nanoparticle films fabricated by ionic self-assembly, also known as layer-by-layer (LbL) deposition. Utilizing electrostatic attraction of oppositely-charged materials permits uniform and rapid growth of …
-
Sustainable battery engineering: single-step battery recycling, battery modeling, and battery electrolyte analysis
… in this thesis help fill the gap in published thermophysical properties of battery electrolytes. Immersion thermo-optic phase spectroscopy (I-TOPS) is introduced as a novel and effective tool for determining the thermal conductivity of liquids, liquid mixtures, and battery electrolytes. I-TOPS …
-
Nonlinear photonics with applications in lightwave communications
… applications. Different highly nonlinear optical materials have been considered for the investigation of Lightwave communications data carriers, with a focus on the optical carrier pulsewidth. A state-of-the-art novel method has been developed to measure pico-second optical carrier pulses …
-
Measuring Nonlinear Properties of Graphene Thin Films Using Z-Scan Technique
… (n2), nonlinear absorption coefficient (β), and thermo-optic coefficient (dn/dT), which are dependent on the laser power and temperature of graphene thin film materials. Many techniques have been used for measuring the nonlinear parameters, and the Z-scan method has been considered the standard …
Page 1 of 2