Enhancing and Modulating Light Emission by Surface Plasmon or Photonic Crystal
Date Issued
2007
Date
2007
Author(s)
Chuang, Chih-Min
DOI
en-US
Abstract
Enhancing and modulating light emission by surface plasmon or photonic crystal was studied in this dissertation.
For the surface plasmon, two kinds of two dimensional metal periodic arrays are investigated. The silver coated PMMA arrays are fabricated by electron beam patterned PMMA and thermal evaporated silver metal. The silver oxide exhibits photoactived fluorescence. By adjusting column diameters and lattice constants of the array to coincide with the excitation wavelength, the fluorescence was markedly enhanced.
The gold coated CdSe/PMMA array are fabricated by electron beam patterned CdSe/PMMA and thermal evaporated gold metal. The semiconductor CdSe nanoparticles exhibit the quantum confined fluorescence. The main surface plasmon resonance was red shifted as we increased the column diameter. The fluorescence also can be enhanced by adjusting column diameters.
We have developed a direct writing resist from water based spin-coatable LSMO material by using its precursor sol gel solution and the patterned LSMO film that can be developed using nontoxic and environmental friendly pure water. Additional, the LSMO can be a good photonic crystal material due to its high refractive index. (n=2.38) The absorbance spectra of the La0.7Sr0.3MnO3 resist can be tuned in a fixed design pattern by varying the electron dose. The photoluminescence of CdSe can be manipulated by 2D LSMO photonic crystal. The magnetic properties of the patterned LSMO can be enhanced by post sintering the sample at 900oC for 4 hours after e-beam writing.
We have also fabricated 3D silica photonic crystal to modulate the photoluminescence of CdSe nanoparticles. The 3D silica photonic crystals were fabricated either by gravitational sedimentation or convective method. The photonic crystal band gap can be changed by controlling the diameter of the silica spheres. The photoluminescence of CdSe nanopartilces can be either enhanced or decreased.
Subjects
光子晶體
表面電漿
自組裝
螢光
奈米粒子
photonic crystal
surface plasmon
self-assembly
fluorescence
nanoparticle
Type
thesis
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