Current Search: Nonlinear Spectroscopy (x)
View All Items
 Title
 Absorptive and Refractive Optical Nonlinearities in Organic Molecules and Semiconductors.
 Creator

Peceli, Davorin, Hagan, David, Vanstryland, Eric, Christodoulides, Demetrios, Belfield, Kevin, University of Central Florida
 Abstract / Description

The main purpose of this dissertation to investigate photophysical properties, third order nonlinearity and free carrier absorption and refraction in organic materials and semiconductors. Special emphasis of this dissertation is on characterization techniques of molecules with enhanced intersystem crossing rate and study of different approaches of increasing triplet quantum yield in organic molecules. Both linear and nonlinear characterization methods are described. Linear spectroscopic...
Show moreThe main purpose of this dissertation to investigate photophysical properties, third order nonlinearity and free carrier absorption and refraction in organic materials and semiconductors. Special emphasis of this dissertation is on characterization techniques of molecules with enhanced intersystem crossing rate and study of different approaches of increasing triplet quantum yield in organic molecules. Both linear and nonlinear characterization methods are described. Linear spectroscopic characterization includes absorption, fluorescence, quantum yield, anisotropy, and singletoxygen generation measurements. Nonlinear characterization, performed by picosecond and femtosecond laser systems (single and double pumpprobe and Zscan measurements), includes measurements of the triplet quantum yields, excitedstate absorption, twophoton absorption, nonlinear refraction and singlet and tripletstate lifetimes.The double pumpprobe technique is a variant of the standard pumpprobe method but uses two pumps instead of one to create two sets of initial conditions for solving the rate equations allowing a unique determination of singlet and tripletstate absorption parameters and transition rates. The advantages and limitations of the the double pumpprobe technique are investigated theoretically and experimentally, and the influences of several experimental parameters on its accuracy are determined. The accuracy with which the double pumpprobe technique determines the tripletstate parameters improves when the fraction of the population in the triplet state relative to the ground state is increased. Although increased accuracy is in principle achievable by increasing the pump fluence in the reverse saturable absorption range, it is shown that the DPP is optimized by working in the saturable absorption regime.Two different approaches to increase intersystem crossing rates in polymethinelike molecules are presented: traditional heavy atom substitution and molecular levels engineering. Linear and nonlinear optical properties of a series of polymethine dyes with Br and Se atoms substitution, and a series of new squaraine molecules, where one or two oxygen atoms in a squaraine bridge are replaced with sulfur atoms, are investigated. A consequence of the oxygentosulfur substitution in squaraines is the inversion of their lowest lying ??* and n?* states leading to a significant reduction of singlettriplet energy difference and opening of an additional intersystem channel of relaxation. Experimental studies show that triplet quantum yields for polymethine dyes with heavyatom substitutions are small (not more than 10%), while for sulfurcontaining squaraines these values reach almost unity. Experimental results are in agreement with density functional theory calculations allowing determination of the energy positions, spinorbital coupling, and electronic configurations of the lowest electronic transitions.For three different semiconductors: GaAs, InP and InAsP two photon absorption, nonlinear refraction and free carrier absorption and refraction spectrums are measured using Zscan technique. Although two photon absorption spectrum agrees with the shape of theoretical prediction, values measured with picosecond system are off by the factor of two. Nonlinear refraction and free carrier nonlinearities are in relatively good agreement with theory. Theoretical values of the third order nonlinearities in GaAs are additionally confirmed with femtosecond Zscan measurements. Due to large spectral bandwidth of femtosecond laser, three photon absorption spectrum of GaAs was additionally measured using picosecond Zscan. Again, spectral shape is in excellent agreement with theory however values of three photon absorption cross sections are larger than theory predicts. ?
Show less  Date Issued
 2013
 Identifier
 CFE0004735, ucf:49815
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0004735
 Title
 In Actu Et In Silicio: Linear and Nonlinear Photophysical Characterization of a Novel Europium Complex, and Incorporating Computational Calculations in the Analysis of Novel Organic Compounds.
 Creator

Woodward, Adam, Belfield, Kevin, Campiglia, Andres, Harper, James, Frazer, Andrew, Cheng, Zixi, University of Central Florida
 Abstract / Description

Despite not being a tangible substance, light is becoming an increasingly valuable tool in numerous areas of science and technology: the use of laser excitation of a fluorescent probe can generate incredibly detailed images of cellular structures without the need for large amounts of dissection; new types of solar cells are being produced using organic dyes to harvest light; computer data can be stored by inducing a chemical change in a compound through irradiation with light. However, before...
Show moreDespite not being a tangible substance, light is becoming an increasingly valuable tool in numerous areas of science and technology: the use of laser excitation of a fluorescent probe can generate incredibly detailed images of cellular structures without the need for large amounts of dissection; new types of solar cells are being produced using organic dyes to harvest light; computer data can be stored by inducing a chemical change in a compound through irradiation with light. However, before any of these materials can be applied in such a way, their properties must first be analyzed for them to be deemed viable.The focus of this dissertation is the photophysical characterization, linear and nonlinear, of a several novel organic compounds, and a europium complex, as well as using quantum chemical calculation techniques to understand some of the phenomena that are witnessed and begin to develop predictive capability. The nonlinear characterization of compounds utilizes wavelengths outside of their linear absorption range, where a focused beam can achieve the same excitation as one at half the wavelength, though this effect has a quadratic dependence on power.The potential for nonlinear excitation, or twophoton absorption (2PA), is becoming of increasing interest and importance for organic chromophores. Exciting only a small volume of material at a focal point makes it possible to nondestructively image samples in 3dimensions, record data in multiple layers, and fabricate intricate structures through photopolymerization reactions.Lanthanides such as europium are known to exhibit sharp emission bands when excited, typically through an antenna effect due to the low probability of achieving direct excitation. This emission is longlived, and through gating systems can readily be separated from background noise and autofluorescence (often observed in biological samples) that have much shorter lifetimes. Thus, one of the foci of this dissertation is the photophysical investigation of a series of novel lanthanide complexes, with particular attention to a europium complex.
Show less  Date Issued
 2014
 Identifier
 CFE0005908, ucf:50891
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0005908
 Title
 MOLECULAR STRUCTURE – NONLINEAR OPTICAL PROPERTY RELATIONSHIPS FOR A SERIES OF POLYMETHINE AND SQUARAINE MOLECULES.
 Creator

Fu, Jie, Van Stryland, Eric, University of Central Florida
 Abstract / Description

This dissertation reports on the investigation of the relationships between molecular structure and twophoton absorption (2PA) properties for a series of polymethine and squaraine molecules. Current and emerging applications exploiting the quadratic dependence upon laser intensity, such as twophoton fluorescence imaging, threedimensional microfabrication, optical data storage and optical limiting, have motivated researchers to find novel materials exhibiting strong 2PA. Organic materials...
Show moreThis dissertation reports on the investigation of the relationships between molecular structure and twophoton absorption (2PA) properties for a series of polymethine and squaraine molecules. Current and emerging applications exploiting the quadratic dependence upon laser intensity, such as twophoton fluorescence imaging, threedimensional microfabrication, optical data storage and optical limiting, have motivated researchers to find novel materials exhibiting strong 2PA. Organic materials are promising candidates because their linear and nonlinear optical properties can be optimized for applications by changing their structures through molecular engineering. Polymethine and squaraine dyes are particularly interesting because they are fluorescent and showing large 2PA. We used three independent nonlinear spectroscopic techniques (Zscan, twophoton fluorescence and whitelight continuum pumpprobe spectroscopy) to obtain the 2PA spectra revealing 2PA bands, and we confirm the experimental data by comparing the results from the different methods mentioned. By systematically altering the structure of polyemthines and squaraines, we studied the effects of molecular symmetry, strength of donor terminal groups, conjugation length of the chromophore chain, polarity of solvents, and the effects of placing bridge molecules inside the chromophore chain on the 2PA properties. We also compared polymethine, squaraine, croconium and tetraon dyes with the same terminal groups to study the effects of the different additions inserted within the chromophore chain on their optical properties. Near IR absorbing squaraine dyes were experimentally observed to show extremely large 2PA cross sections ( 30000GM). A simplified threelevel model was used to fit the measured 2PA spectra and detailed quantum chemical calculations revealed the reasons for the squaraine to exhibit strong 2PA. In addition, twophoton excitation fluorescence anisotropy spectra were measured through multiple 2PA transitions. A theoretical model based on fourlevels with two intermediate states was derived and used for analysis of the experimental data.
Show less  Date Issued
 2006
 Identifier
 CFE0001350, ucf:46967
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0001350
 Title
 White Light Continuum for Broadband Nonlinear Spectroscopy.
 Creator

Ensley, Trenton, Hagan, David, Vanstryland, Eric, Zeldovich, Boris, Christodoulides, Demetrios, Schulte, Alfons, University of Central Florida
 Abstract / Description

Supercontinuum (SC) generation, oftentimes referred to as whitelight continuum (WLC), has been a subject of interest for more than 40 years. From the first observation of WLC in condensed media in the early 1970s to the first observation of WLC in gases in the mid1980s, much work has been devoted to developing a framework for understanding the complex nature of this phenomenon as well as discovering its utility in various applications. The main effort of this dissertation is to develop a...
Show moreSupercontinuum (SC) generation, oftentimes referred to as whitelight continuum (WLC), has been a subject of interest for more than 40 years. From the first observation of WLC in condensed media in the early 1970s to the first observation of WLC in gases in the mid1980s, much work has been devoted to developing a framework for understanding the complex nature of this phenomenon as well as discovering its utility in various applications. The main effort of this dissertation is to develop a WLC for the purpose of broadband nonlinear spectroscopy and use it in spectroscopic measurements. The ability to generate a highquality, highspectralirradiance source of radiation confined in a single beam that spans the visible and nearinfrared spectral regimes has great utility for nonlinear measurement methods such as the Zscan technique. Using a broadband WLC instead of conventional tunable sources of radiation such as optical parametric generators/amplifiers has been shown to increase the efficiency of such measurements by nearly an order of magnitude. Although WLC generation has many complex processes involved, and complete models of the process involve highly complex numerical modeling, simple models can still guide us in the optimization of systems for WLC generation. In this dissertation the effects of two key mechanisms behind WLC generation in gaseous media are explored: selfphase modulation (SPM) and ionization leading to plasma production. The effects of SPM are largely dependent upon the thirdorder nonlinear refractive index, n2, of the gaseous medium whereas the effects of plasma production are dependent upon many parameters including the initial number density, ionization potential/energy, and the rate of ionization production. It is found that in order to generate a stable WLC suitable for nonlinear spectroscopy, the phase contributions from SPM and plasma production should be nearly equal. This guided our experiments in inert gases using mJ level, 150 fsFWHM (fullwidth at halfmaximum) pulses at 780 nm as well as 40 fsFWHM pulses primarily at 1800 nm to create a stable, highspectralirradiance WLC. The generated WLC is shown to have sufficient spectral energy and spatial quality suitable for nonlinear spectroscopic measurements. In addition to extending the WLC bandwidth by using a long wavelength (1800 nm) pump source, it is found that by using a secondary weak seed pulse with a peak irradiance three orders of magnitude less than the main pulse, the spectral energy density is enhanced by more than a factor of 3 in Krypton gas for a WLC spectrum that spans over 2 octaves. Numerical simulations are presented which qualitatively describe the experimental results. The spectral enhancement of the WLC by seeding is also demonstrated for other inert gases and condensed media. Other efforts described in this dissertation include the development of the DualArm Zscan technique and its extension to measuring thin film nonlinearities in the presence of large substrate signals as well as predicting the n2 spectra of organic molecules (where we can approximate their behavior as if they were centrosymmetric) from knowledge of the onephoton and twophoton absorption spectra using a simplified sumoverstates quantum perturbative model by utilizing a quasi 3level and quasi 4level system.
Show less  Date Issued
 2015
 Identifier
 CFE0005608, ucf:50264
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0005608
 Title
 Nonlinear Optical Response of Simple Molecules and TwoPhoton Semiconductor Lasers.
 Creator

Reichert, Matthew, Vanstryland, Eric, Hagan, David, Likamwa, Patrick, Peale, Robert, University of Central Florida
 Abstract / Description

This dissertation investigates two long standing issues in nonlinear optics: complete characterization of the ultrafast dynamics of simple molecules, and the potential of a twophoton laser using a bulk semiconductor gain medium. Within the BornOppenheimer approximation, nonlinear refraction in molecular liquids and gases can arise from both boundelectronic and nuclear origins. Knowledge of the magnitudes, temporal dynamics, polarization and spectral dependences of each of these mechanisms...
Show moreThis dissertation investigates two long standing issues in nonlinear optics: complete characterization of the ultrafast dynamics of simple molecules, and the potential of a twophoton laser using a bulk semiconductor gain medium. Within the BornOppenheimer approximation, nonlinear refraction in molecular liquids and gases can arise from both boundelectronic and nuclear origins. Knowledge of the magnitudes, temporal dynamics, polarization and spectral dependences of each of these mechanisms is important for many applications including filamentation, whitelight continuum generation, alloptical switching, and nonlinear spectroscopy. In this work the nonlinear dynamics of molecules are investigated in both liquid and gas phase with the recently developed beam deflection technique which measures nonlinear refraction directly in the time domain. Thanks to the utility of the beam deflection technique we are able to completely determine the thirdorder response function of one of the most important molecular liquids in nonlinear optics, carbon disulfide. This allows the prediction of essentially any nonlinear refraction or twophoton absorption experiment on CS2. Measurements conducted on air (N2 and O2) and gaseous CS2 reveal coherent rotational revivals in the degree of alignment of the ensemble at a period that depends on its moment of inertia. This allows measurement of the rotational and centrifugal distortion constants of the isolated molecules. Additionally, the rotational contribution to the beam deflection measurement can be eliminated thanks to the particular polarization dependence of the mechanism. At a specific polarization, the dominant remaining contribution is due to the boundelectrons. Thus both the boundelectronic nonlinear refractive index of air, and second hyperpolarizability of isolated CS2 molecules, are measured directly. The later agrees well with liquid CS2 measurements, where local field effects are significant. The second major portion of this dissertation addresses the possibility of using bulk semiconductors as a twophoton gain medium. A twophoton laser has been a goal of nonlinear optics since shortly after the original laser's development. In this case, twophotons are emitted from a single electronic transition rather than only one. This processes is known as twophoton gain (2PG). Semiconductors have large twophoton absorption coefficients, which are enhanced by ~2 orders of magnitude when using photons of very different energies, e.g., ??_a?10??_b. This enhancement should translate into large 2PG coefficients as well, given the inverse relationship between absorption and gain. Here, we experimentally demonstrate both degenerate and nondegenerate 2PG in optically excited bulk GaAs via pumpprobe experiments. This constitutes, to my knowledge, the first report of nondegenerate twophoton gain. Competition between 2PG and competing processes, namely intervalence band and nondegenerate threephoton absorption (ND3PA), in both cases are theoretically analyzed. Experimental measurements of ND3PA agree with this analysis and show that it is enhanced much more than ND2PG. It is found for both degenerate and nondegenerate photon pairs that the losses dominate the twophoton gain, preventing the possibility of a twophoton semiconductor laser.
Show less  Date Issued
 2015
 Identifier
 CFE0005874, ucf:50871
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0005874
 Title
 NONLINEAR ABSORPTION AND FREE CARRIER RECOMBINATION IN DIRECT GAP SEMICONDUCTORS.
 Creator

Olszak, Peter, Van Stryland, Eric, University of Central Florida
 Abstract / Description

Nonlinear absorption of Indium Antimonide (InSb) has been studied for many years, yet due to the complexity of absorption mechanisms and experimental difficulties in the infrared, this is still a subject of research. Although measurements have been made in the past, a consistent model that worked for both picosecond and nanosecond pulse widths had not been demonstrated. In this project, temperature dependent twophoton (2PA) and free carrier absorption (FCA) spectra of InSb are measured using...
Show moreNonlinear absorption of Indium Antimonide (InSb) has been studied for many years, yet due to the complexity of absorption mechanisms and experimental difficulties in the infrared, this is still a subject of research. Although measurements have been made in the past, a consistent model that worked for both picosecond and nanosecond pulse widths had not been demonstrated. In this project, temperature dependent twophoton (2PA) and free carrier absorption (FCA) spectra of InSb are measured using femtosecond, picosecond, and nanosecond IR sources. The 2PA spectrum is measured at room temperature with femtosecond pulses, and the temperature dependence of 2PA and FCA is measured at 10.6m using a nanosecond CO2 laser giving results consistent with the temperature dependent measurements at several wavelengths made with a tunable picosecond system. Measurements over this substantial range of pulse widths give results for FCA and 2PA consistent with a recent theoretical model for FCA. While the FCA cross section has been generally accepted in the past to be a constant for the temperatures and wavelengths used in this study, this model predicts that it varies significantly with temperature as well as wavelength. Additionally, the results for 2PA are consistent with the band gap scaling (Eg3) predicted by a simple two parabolic band model. Using nanosecond pulses from a CO2 laser enables the recombination rates to be determined through nonlinear transmittance measurements. Threephoton absorption is also observed in InSb for photon energies below the 2PA band edge. Prior to this work, data on threephoton absorption (3PA) in semiconductors was scarce and most experiments were performed over narrow spectral ranges, making comparison to the available theoretical models difficult. There was also disagreement between the theoretical results generated by different models, primarily in the spectral behavior. Therefore, we studied the band gap scaling and spectra of 3PA in several semiconductors by the Zscan technique. The 3PA coefficient is found to vary as (Eg7), as predicted by the scaling rules of simple two parabolic band models. The spectral behavior, which is considerably more complex than for 2PA, is found to agree well with a recently published theory based on a fourband model.
Show less  Date Issued
 2010
 Identifier
 CFE0003402, ucf:48418
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0003402
 Title
 EXPERIMENTAL AND THEORETICAL STUDY OF THE OPTICAL PROPERTIES OF SEMICONDUCTOR QUANTUM DOTS.
 Creator

Nootz, Gero, Cuenya , Beatriz, University of Central Florida
 Abstract / Description

The aim of this dissertation is to gain a better understanding of the unique electronic structure of lead salt quantum dots (QDs) and its influences on the nonlinear optical (NLO) properties as well as the time dynamics of the photogenerated charge carriers. A variety of optical techniques such as Zscan, twophoton excited fluorescence and timeresolved pump probe spectroscopy are used to measure these properties. The onephoton as well as the degenerate and nondegenerate twophoton...
Show moreThe aim of this dissertation is to gain a better understanding of the unique electronic structure of lead salt quantum dots (QDs) and its influences on the nonlinear optical (NLO) properties as well as the time dynamics of the photogenerated charge carriers. A variety of optical techniques such as Zscan, twophoton excited fluorescence and timeresolved pump probe spectroscopy are used to measure these properties. The onephoton as well as the degenerate and nondegenerate twophoton absorption (2PA) spectra are measured and the electronic wave functions from a fourband envelope function formalism are used to model the results. We observe local maxima in the 2PA spectra for QD samples of many different sizes at energies where only 1PA is predicted by the model. This is similar to the previously measured transitions in the 1PA spectra which are not predicted by the model but accrue at the energies of the twophoton allowed transitions. Most importantly we observe 2PA peaks for all samples at the energy of the first onephoton allowed transition. This result can only be understood in terms of symmetry breaking and therefore is strong evidence that other transitions, not predicted by the model if the selection rules are left intact, also have the origin in the lifted spatial symmetry of the wave functions. On the other hand, the uniquely symmetric eigenenergies of these quantumconfined energy states in the conduction and valance bands explain the observed trend toward larger twophoton crosssections as the quantum confinement is increased in smaller QDs. Moreover, this unique feature is shown to reduce the possible relaxation channels for photoexcited carriers, which is confirmed experimentally by the reduced carrier relaxation rate as compared to CdSe QDs which lack this symmetry. Carrier multiplication (CM), a process in which several electrons are excited by the absorption of a single photon is studied in PbS QDs. We show that for PbS QDs with radius smaller than 2.5 nm the parameters of CM get very close to the theoretical optimum. Nextgeneration solar cells operating under these ideal conditions could potentially have conversion efficiency of up to 42%. This compares favorably to the 30% efficiency limit of a single junction silicon solar cell.
Show less  Date Issued
 2010
 Identifier
 CFE0003396, ucf:48413
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0003396
 Title
 Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuronelectrode interface.
 Creator

Thakore, Vaibhav, Hickman, James, Mucciolo, Eduardo, Rahman, Talat, Johnson, Michael, Behal, Aman, Molnar, Peter, University of Central Florida
 Abstract / Description

Extracellular neuroelectronic interfacing has important applications in the fields of neural prosthetics, biological computation and wholecell biosensing for drug screening and toxin detection. While the field of neuroelectronic interfacing holds great promise, the recording of highfidelity signals from extracellular devices has long suffered from the problem of low signaltonoise ratios and changes in signal shapes due to the presence of highly dispersive dielectric medium in the neuron...
Show moreExtracellular neuroelectronic interfacing has important applications in the fields of neural prosthetics, biological computation and wholecell biosensing for drug screening and toxin detection. While the field of neuroelectronic interfacing holds great promise, the recording of highfidelity signals from extracellular devices has long suffered from the problem of low signaltonoise ratios and changes in signal shapes due to the presence of highly dispersive dielectric medium in the neuronmicroelectrode cleft. This has made it difficult to correlate the extracellularly recorded signals with the intracellular signals recorded using conventional patchclamp electrophysiology. For bringing about an improvement in the signaltonoise ratio of the signals recorded on the extracellular microelectrodes and to explore strategies for engineering the neuronelectrode interface there exists a need to model, simulate and characterize the cellsensor interface to better understand the mechanism of signal transduction across the interface. Efforts to date for modeling the neuronelectrode interface have primarily focused on the use of point or area contact linear equivalent circuit models for a description of the interface with an assumption of passive linearity for the dynamics of the interfacial medium in the cellelectrode cleft. In this dissertation, results are presented from a nonlinear dynamic characterization of the neuroelectronic junction based on VolterraWiener modeling which showed that the process of signal transduction at the interface may have nonlinear contributions from the interfacial medium. An optimization based study of linear equivalent circuit models for representing signals recorded at the neuronelectrode interface subsequently proved conclusively that the process of signal transduction across the interface is indeed nonlinear. Following this a theoretical framework for the extraction of the complex nonlinear material parameters of the interfacial medium like the dielectric permittivity, conductivity and diffusivity tensors based on dynamic nonlinear VolterraWiener modeling was developed. Within this framework, the use of Gaussian bandlimited white noise for nonlinear impedance spectroscopy was shown to offer considerable advantages over the use of sinusoidal inputs for nonlinear harmonic analysis currently employed in impedance characterization of nonlinear electrochemical systems. Signal transduction at the neuronmicroelectrode interface is mediated by the interfacial medium confined to a thin cleft with thickness on the scale of 20110 nm giving rise to Knudsen numbers (ratio of mean free path to characteristic system length) in the range of 0.015 and 0.003 for ionic electrodiffusion. At these Knudsen numbers, the continuum assumptions made in the use of PoissonNernstPlanck system of equations for modeling ionic electrodiffusion are not valid. Therefore, a lattice Boltzmann method (LBM) based multiphysics solver suitable for modeling ionic electrodiffusion at the mesoscale neuronmicroelectrode interface was developed. Additionally, a molecular speed dependent relaxation time was proposed for use in the lattice Boltzmann equation. Such a relaxation time holds promise for enhancing the numerical stability of lattice Boltzmann algorithms as it helped recover a physically correct description of microscopic phenomena related to particle collisions governed by their local density on the lattice. Next, using this multiphysics solver simulations were carried out for the charge relaxation dynamics of an electrolytic nanocapacitor with the intention of ultimately employing it for a simulation of the capacitive coupling between the neuron and the planar microelectrode on a microelectrode array (MEA). Simulations of the charge relaxation dynamics for a step potential applied at t = 0 to the capacitor electrodes were carried out for varying conditions of electric double layer (EDL) overlap, solvent viscosity, electrode spacing and ratio of cation to anion diffusivity. For a large EDL overlap, an anomalous plasmalike collective behavior of oscillating ions at a frequency much lower than the plasma frequency of the electrolyte was observed and as such it appears to be purely an effect of nanoscale confinement. Results from these simulations are then discussed in the context of the dynamics of the interfacial medium in the neuronmicroelectrode cleft. In conclusion, a synergistic approach to engineering the neuronmicroelectrode interface is outlined through a use of the nonlinear dynamic modeling, simulation and characterization tools developed as part of this dissertation research.
Show less  Date Issued
 2012
 Identifier
 CFE0004797, ucf:49718
 Format
 Document (PDF)
 PURL
 http://purl.flvc.org/ucf/fd/CFE0004797