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.
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Showing 1 to 20 of 46 for “"optical modes"”.
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Brillouin scattering induced transparency and generation of slow and fast light
… analogue of EIT is demonstrated using the two optical modes that are coupled through a phase matched acoustic mode. The coherent coupling of two energy levels is emulated by the acousto-optic interaction of Brillouin scattering. The probe phase response is analyzed to estimate BSIT's effect on …
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Molecular Characterization of Human Tissue Samples by Raman Spectroscopy with Different Laser Modes and Excitation Wavelengths
… the influence of both excitation wavelengths and optical modes. Different optical modes, single mode and multimode lasers, with the same excitation 785 nm and different excitation wavelengths, 785 nm and 830 nm lasers with the same multimode are compared here. According to this study, …
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Full-vectorial study of light and sound interactions in low and high index contrast silica waveguides
… to find accurate modal solutions of acoustic modes in Ge-doped and un-doped planar silica waveguides. The structural symmetry is exploited and Aitken’s extrapolation is also used to improve the accuracy of the solutions. The spatial dependences of the dominant and non-dominant displacement …
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Enhancing solar cells with plasmonic nanovoids
… access to the energy-momentum dispersion of optical modes within nanostructured materials. A four-fold enhancement of overall power conversion efficiency is observed in organic nanovoid solar cells compared to flat solar cells. The efficiency enhancement is shown to be primarily due to strong …
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The characterisation of acoustic waves in optical waveguides
… The Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices …
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Characterisation of acoustic waves in optical waveguides
… The Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices …
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Modal Optical Studies of Multi-Moded Ultra-Low-Noise Detectors in Far-Infrared
… modelling the behaviour of partially coherent optical systems and multi-mode detectors. The numerical simulations were carried out for the ultra-low-noise Transition Edge Sensors (TESs) being proposed for use on the SAFARI instrument on the cooled aperture infrared space telescope SPICA (34 - …
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Stimulated Brillouin scattering in an on-chip microdisk resonator
… are three waves involved in the process: two optical waves (pump and scattered light) and one acoustic wave, and the scattering process is restricted through the conservation of momentum and energy. Stimulated Brillouin Scattering (SBS) occurs when the interference between the pump and …
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Two quantum photoconductivity in potassium iodide
… the increase in mobility as the longitudinal optical modes of lattice vibration freeze out. The electric and magnetic field dependences indicate higher mobilities than usually found in colored alkali halide crystals.
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Unitary transformations on temporal modes using dispersive optics for Boson Sampling and quantum simulation
Conventionally, unitary transformations on optical modes have been implemented on a spatial basis set using a system of beam splitters and phase shifters. We present methods which allow orders of magnitude increase in the number of modes in linear optics experiments by moving from spatial encoding …
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Οπτικές ιδιότητες του αραιού μαγνητικού ημιαγωγού Ζn₁₋ₓΜnₓS
… The Raman spectra have supplied the optical phonon frequencies of the lattice and the impurity induced modes. From the concentration dependence of the optical modes, an 'one-mode' behavior has been established. By applying the configuration coordinate model, the lattice properties …
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Controlling light-matter interaction with resonant semiconductor nanostructure
This thesis aims to bridge dielectric materials' optical and electronic properties to obtain full control of light-matter interaction at the nanoscale. The outcomes may open the way for tunable, ultra-thin, cost-effective, and energy-saving optoelectronic devices. This research first studies the …
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Study on the photoelectric hot electrons generation and transport with metallic-semiconductor photonic crystals
… in metal-semiconductor junctions allows for optical-to- electrical energy conversion at photon energies below the bandgap of the semiconductor. Which opens new opportunities in optical sensors and energy conversion devices. In this thesis research, the wafer-scale metallic-semiconductor …
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Computer simulation of lattice defects in Ni₃Al
… were found to relax in two different oscillation modes namely the acoustic and optical modes. While the former is similar to the relaxation observed in pure Aluminum or Nickel, the latter was found to be a result of micromoments within the unit cell. The presence of atoms that differ in size and …
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High-Dimensional Quantum Information: From Sensing to Underwater Quantum Communication
… Laguerre-Gaussian (LG) and vector vortex optical modes in underwater quantum communication channels. Making use of these high-dimensional states in quantum communication provides certain advantages including increased security and increased information capacity. We investigate underwater …
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DNA nanotechnology for light-emitting plasmonic applications
… light into nanometric spaces, sustaining an optical resonance. This resonance can be carefully tuned by changing the geometry and material of the gap. In this work, I use the NanoParticle-on-Mirror (NPoM) geometry to fabricate plasmonic cavities in a bottom-up fashion by simply drop casting …
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Passive damping of a LIGO mirror
… that with this increased radiation pressure, optical modes in the cavity may overlap with acoustic modes of the mirrors and excite mechanical motion. If such a parametric instability occurs, it will disrupt the operation of the interferometer. In this thesis I test a method to passively damp …
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Numerical Simulation of Vertical Cavity Surface Emitting Lasers
… of a closed boundary imposed on the optical modes by Minilase is no longer acceptable. Therefore, the extension of Minilase primarily required the development of a more sophisticated optical mode set for use with open VCSEL structures. The theory of this mode set is rigorously …
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Optical excitations in cold gases
… the effects of interparticle interactions on the optical spectrum of cold gases. We first consider homogenous gas in the weak excitation regime and find that the optical spectrum of a system of Bosons is highly sensitive to interactions. We find that optical excitations, at temperatures low enough …
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Scalable development of multiplexed microparticle technologies for optical single-cell barcoding
… diversity and interaction of individual cells. Optical imaging techniques with single cell resolution have played an invaluable role in developing an understanding of cellular identity and function. However, current imaging techniques, although widely used to distinguish several different cell …
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