Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: V
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CHAPTER 4: SPECTRAL STRAIN MAPPING.................................. ....... 35
4.1 Introduction ......... .... .... ...................... ............35
4.2 The Huang-Rhys Parameter (S) ..................................... 36
4.3 Calculating S....................... ................................................ 37
4.3.1 The Exciton W avefunction .............. ..................... 38
4.3.2 The Phonon Dispersion Relation..................................... 44
4.3.3 AjBj - The Interface Constants ........................................ ........ 47
4.3.4 F - The Electron-Phonon Coupling Strength ..... .................. 48
4.4 S and Strain ...................................... ........................ .. . 51
4.5 Application: Near-field Strain Mapping ............................. .................. 53
4.6 Summary and Future W ork...................................................... 57
CHAPTER 5: THE IMAGE CHARGE EFFECT .................................... 59
5.1 Emission Enhancement and Applied Plasmonics .............................. 59
5.2 Anomalous Photoluminescence Results ................... ................. 60
5.3 The Im age Charge Effect.................................................... 61
5.4 Modeling the Image Charge Effect ................................. .... 64
5.5 Power Saturation and Screening ............................ ............ 68
5.6 Angle Dependent PL Measurements .................................. .................. 73
5.7 Modification of Electron-Phonon Coupling .................. .......................... 75
5.8 Near-field Spectroscopy................................. ................. 77
5.9 Fluorescence Lifetime Imaging Microscopy ........................................... 79
5.10 Summary and Future Research ......... ............................................... 80
APPENDIX A: DERIVATION OF EQUATION FOR NET FORCE ON EXCITON .......... 83
APPENDIX B: REFLECTION AND ANGLE DEPENDENT INTENSITY....................... 89
R E F E R E N C E S .......................................................................................9 3
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Llopis, Antonio. Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures, dissertation, May 2012; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc115113/m1/6/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .