The Extraordinary Optical Transmission and Absorption of metallic Sub-wavelength hole arrays
Date Issued
2010
Date
2010
Author(s)
Hong, Wei-Ting
Abstract
In electromagnetic science, subwavelength structure means that characteristic length of the structure is smaller than incident electromagnetic wavelength. While the arrangements of the structures are period, the structures have tunable resonance and effective dielectric material. These characters can build some materials that are not found in nature. We can call these artificial structures as meta-materials, just like negative permeability, negative refraction index, some special anisotropic and inhomogeneous materials. These ideals derive from the arrangements of atoms in microscopic that will influence the physical properties in macroscopic. In microwave band, we usually name sub-wavelength periodic structures as frequency selective surface. Because they possess band-pass and band-stop identities, what are often used to be filters, reflectors, radar receivers or guided wave controllers. In optical band, they are not only used to be optical gratings but also popular researches about photonic crystals. they can be applied to optical displayers, optical extractors, optical storages, optical sensors...etc. Recently, many scholars use the resonance of meta-materials to attain extraordinary transmission, extraordinary absorption, optical capture and chiral structures...etc. Even a new research is about using optical transformation theorem to achieve optical invisible.
This thesis emphasize using electromagnetic theorem to explore and analyze the mechanism of resonance modes. they include Lorentzian resonance, Bragg resonance, surface plasmon resonance, Fabry-Perot resonance, guided mode resonance and Fano resonance. Electromagnetic theorems include the patterns and magnitude of electromagnetic field, surface bounded charges, induced currents, time average power flow. Materials we used include perfectly electric conductors, real metals, dielectric materials. Parameters we used include one dimension slits, two dimension holes, lattice constant, shape of holes, thickness of layers and multi-layers. After knowing every mechanisms, we can use them to design frequency selective transmission, reflection and absorption devices.
Subjects
Sub-wavelength periodic structures
Meta-materials
Optical filter
Light absorption
Lorentzian resonance
Bragg resonance
Fano resonance
Surface plasmon polaritons resonance
Fabry-Perot resonance
Guided mode resonance
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R97543032-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):ede571254055e0b6d24d74386595098f