LabAdviser/Technology Research/Fabrication of Hyperbolic Metamaterials using Atomic Layer Deposition: Difference between revisions
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==Project Description== | ==Project Description== | ||
[[image:HMM_implementation_topology.png| | [[image:HMM_implementation_topology.png|600px|thumb|Figur 1. Schematics of (a) a multilayer and (b) a nanowire hyperbolic metamaterial.]] | ||
This project deals with the technological development, design, and fabrication of hyperbolic metamaterials (HMMs) - one of the most unusual classes of artificial electromagnetic subwavelength structures. Electrodynamically, HMMs are described by a dielectric permittivity tensor " with components of opposite signs (e.g. <math>\varepsilon_{x}=\varepsilon_{y}<0, \varepsilon_{z}>0</math> ). HMMs possess unusually high wavevector, the optical density of states, and anisotropy, leading to a wide variety of potential applications such as broadband enhancement in the spontaneous emission for a single photon source, subwavelength imaging, sensing, thermal engineering, and steering of optical signals. HMMs have a potential to be a robust and versatile multi-functional platform for nanophotonics in the broad range of operating wavelengths from visible to THz regions and even at microwave region. Despite the proposed architecture of hyperbolic medium, which geometry includes simple metal/dielectric multilayers (Figure 1a) and metallic wires (Figure 1b) incorporated in dielectric host, the fabrication is still challenging, since ultrathin, continuous, pinhole free nanometer-scale coatings are desired.<br> | This project deals with the technological development, design, and fabrication of hyperbolic metamaterials (HMMs) - one of the most unusual classes of artificial electromagnetic subwavelength structures. Electrodynamically, HMMs are described by a dielectric permittivity tensor " with components of opposite signs (e.g. <math>\varepsilon_{x}=\varepsilon_{y}<0, \varepsilon_{z}>0</math> ). HMMs possess unusually high wavevector, the optical density of states, and anisotropy, leading to a wide variety of potential applications such as broadband enhancement in the spontaneous emission for a single photon source, subwavelength imaging, sensing, thermal engineering, and steering of optical signals. HMMs have a potential to be a robust and versatile multi-functional platform for nanophotonics in the broad range of operating wavelengths from visible to THz regions and even at microwave region. Despite the proposed architecture of hyperbolic medium, which geometry includes simple metal/dielectric multilayers (Figure 1a) and metallic wires (Figure 1b) incorporated in dielectric host, the fabrication is still challenging, since ultrathin, continuous, pinhole free nanometer-scale coatings are desired.<br> | ||
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image:pillars.jpg| AZO pillars. | image:pillars.jpg| AZO pillars. | ||
image:tubes.jpg| AZO tubes. | image:tubes.jpg| AZO tubes. | ||
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<gallery caption="Fabricated metamaterials based on Al-doped ZnO" widths="500px" heights="500px" perrow="4"> | |||
image:11.jpg| AZO trenches in air host. | |||
image:22.jpg| AZO trenches in Si host. | |||
image:33.jpg| AZO trenches in Si host. | |||
image:44.jpg| AZO trenches in Si host. | |||
</gallery> | </gallery> | ||
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