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奈米金屬線結構在光電元件之研究與應用

為了解決Alexandre Mattiussi的問題，作者許勝裕 這樣論述：

This dissertation contains the studies and applications for three kinds of nanoscale metallic wire structures. The first one is the studies of subwavelength dielectric-loaded surface plasmon polariton (DLSPP) waveguides by using a near-field scanning optical microscopy combined with a high numerica

l aperture (N.A.) optical microscope. We verified the existence of anti-symmetrical mode single-mode in the DLSPP waveguide and observed different propagation properties of SPPs when the light source is launched at different positions near the waveguide entrance. The second one is the polarization s

tudies of subwavelength Au nanoslits. A giant form-birefringence larger than one is induced due to surface plasmon polaritons (SPPs) in gold nanoslit arrays. The last one is the applications of Au Nanowires array for enhancing the light extraction of light emitting devices.The optical fiber tip whic

h is widely used in near field scanning optical microscopy (NSOM) was employed to generate the surface plasmon wave (SPW) at the entrance of the DLSPP waveguide. Comparing with conventional end-fire coupling, the near-field has a higher spatial resolution and more broadband angular spectrum (in Four

ier space). Besides, a high N.A. microscope can observe the radiation of DLSPP waveguide, and the optical images were collected by charge coupling devices (CCD). Previous research reported that there are symmetric and antisymmetric modes supported in the insulator-metal-insulator (IMI) waveguide. T

his thesis is the first one to experimentally confirm the antisymmetric modes. Furthermore, the NSOM and high N.A. microscope were employed to excite and observe, respectively, the bending DLSPP waveguides (L-shape). The results show the SPW can make a 90o turn in the bending waveguides at the speci

al excitation region.Large phase differences between transverse electric (TE) and transverse magnetic (TM) waves were investigated in plasmonic nanoslit arrays. The phase of the TE wave shifts ahead because of its low propagation constant. On the other hand, the phase of the TM wave is retarded due

to the propagation of surface plasmons. The opposite phase shift forms a giant birefringence. The results show that its magnitude is dependent on the width of nanoslits. The birefringence magnitude was ~1 for 300-nm-wide nanoslits and up to ~2.7 for 100 nm ones (the world record was 1 in 2008). Besi

des, the spectroscopic measurements indicate that waveplates made of gold nanoslits have large bandwidths.This dissertation also demonstrates the extraction efficiency enhancement of organic light emitting devices by fabricating Au nanowires on the indium tin oxide (ITO) anode. For the aluminum-tris

-(8-hydroxyquinoline) (Alq3) base devices, a 100 nm-width and 450 nm-period gold nanowire array increases light extraction up to 46% from glass substrate and 80% from the organic layer. Such metallic nanowire arrays can double the brightness with small absorption, only 10% lower than ITO-coated glas

s. In addition, the colors extracted by the nanowires can be selected by the period of nanowire array. We extracted blue to red light extraction by using single Alq3-based device.