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 106 for “"Spontaneous Emission"”.
-
Enhanced Spontaneous Emission And Spectral Analysis Using Waveguide Based Devices.
<p>We will put abstract in here.</p>
-
Plasmonic metamaterial for structural color printing and spontaneous emission control
… structural color printing, and quantum emitter spontaneous emission enhancement.</p><p>In this dissertation two of the most important applications will be addressed. The first application is structure color printing and the other is to control the spontaneous emission rate of quantum emitters …
-
Modal Properties and Spontaneous Emission Factor in Unstable-Resonator Semiconductor Lasers
… modes in the unstable resonator, the spontaneous emission factor, defined as the ratio of the power of the spontaneous emission entering the lasing mode to the total power of the spontaneous emission, is much larger than that of a regular Fabry-Perot cavity of the same dimension. The …
-
Investigating the Modification of Spontaneous Emission using Layer-by-Layer Self-Assembly
The process of spontaneous emission can be dramatically modified by optical micro- and nanostructures. We studied the modification of fluorescence dynamics using a polymer spacer layer fabricated through layer-by-layer (LbL) self-assembly. The advantages of this method are numerous: The …
-
Novel II-IV semiconductor nanocrystal gain media : from amplified spontaneous emission to lasing
… stringent requirements for observing amplified spontaneous emission (ASE), a signature manifestation of gain. Then the synthesis of a robust NCs-titania, sol-gel matrix is described which satisfies these requirements. We exploit the stability and processability of these matrices to study the …
-
The spectral analysis of the spontaneous emission of MIT's 8.8 mm, room temperature, pulsed free electron laser microwiggler
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
-
Computational investigations of nanophotonic systems
… solver to simulate the quantum phenomenon of spontaneous emission and its enhancement by a photonic crystal. The results of these simulations were favorably cross-checked with semi-analytical predictions and experimental results. This code was further extended to simulate spontaneous emission …
-
Controlling light emission with shaped electron wavefunctions
The extent to which can one change the nature of spontaneous emission from a free electron by shaping the its wavefunction has been a long-standing question. In this work, we use both a semi-classical formalism and a QED formalism to show that Bremsstrahlung radiation can be tailored by altering …
-
1.2-micron multi-section quantum dot superluminescent diodes
… allows simultaneous tuning of the ground state emission and excited state emission, resulting in wide bandwidth and high power. Theoretical equations describing the intensity output of the multi-section SLD configuration are presented. It is found that these equations are able to closely predict …
-
Theoretical investigation of metal-cavity nanolasers and nanoLEDs and comparison with experiments
… devices is then investigated. Since the spontaneous emission plays an important role in a small cavity, especially when it works in the LED region, we derive the complete representation for the spontaneous emission in a metal cavity and show that the Purcell effect appears naturally in …
-
Temperature and Spatial Hole Burning Effects in Semiconductor Lasers and Integrated Optical Devices
… using a consistent method involving gain and spontaneous emission measurements to isolate the temperature-sensitive effects. Second, longitudinal spatial hole burning is examined theoretically and experimentally in both Fabry-Perot and index-coupled distributed-feedback lasers. The photon …
-
High Power Sources Near 0.9 Micrometers in *Oxide Glass Fibers
… and experimentally. Parasitics such as amplified spontaneous emission and stimulated Brillouin scattering are also investigated to determine the limitations to this approach.
-
Measurement of the nitrogen(+) ((5)sulfide) state radiative lifetime
… has been measured by directly monitoring the spontaneous emission from stored N{dollar}\sp{+}{dollar} in a radio-frequency ion trap. The electron excitation technique was used to create N{dollar}\sp{+}{dollar}({dollar}\sp5{dollar}S{dollar}\sb2{dollar}), and the spontaneous emission decay curve …
-
Infrared Radiation of Metal Oxidation Chemical Reaction Flames
… have been examined for their stimulated and spontaneous infrared radiative properties. Various thermodynamic, spectroscopic, and thermochemical parameters for the reaction product salt vapors have been calculated in order to characterize energy transfer mechanisms and radiative emissions. …
-
Design of high efficiency Mid IR QCL lasers
… designs, and finally measuring lasing and spontaneous emission performance for various designs.
-
Vacuum-mediated incoherent processes in coherently prepared media
… study of incoherent processes, such as the <br>spontaneous emission of light by an atom mediated by the surrounding vacuum <br>field. One of the reasons for this interest is that the decoherence due to <br>incoherent processes is one of the major limitations to many schemes of <br>current …
-
Functional 2D nanoparticle/polymer array : interfacial assembly, transfer, characterization, and coupling to photonic crystal cavities
… assembly. viii Controlling the rate of spontaneous emission and thus promoting the photon generation efficiency is a key step toward fabrication of Quantum dot based single-photon sources, and harnessing of light energy from emitters with a broad emitting spectrum. Coupling of photo …
-
Feasibility studies for quantum computation with spectral hole burning media
… cavity. The coherence transfer is susceptible to spontaneous emission and cavity decay; the latter is the dominant decay channel for Pr:YSO. I have shown that the coherence transfer can proceed in a cavity dark state which is invulnerable to cavity decay, at the cost of becoming especially …
-
Spin-orbit coupling and supersolidity in ultracold quantum gases
… The realization suppresses heating due to spontaneous emission.
-
Design and fabrication of a light emitting diode using a two-dimensional photonic crystal
… crystal may be used to directly modify the spontaneous emission of a light-emitting diode by eliminating the coupling of light to guided modes. In this work, the design and fabrication of a two-dimensional photonic crystal light-emitting diode with an emission wavelength of 980 nm is …
Page 1 of 6