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- W2053646890 abstract "One’s first experience with an antenna often involves nothing more than positioning one or two metal wires ‘just right’ to capture an invisible television signal. ‘Rabbit ears’ on top of televisions are simple dipole antennae that capturemeter-long electromagnetic waves. Because Maxwell’s equations are independent of length scale, the dipole antenna can be miniaturized to operate with shorter-wavelength radiation. Optical nanoantennae are small metallic particles that resonate at visible and near-IR frequencies. Analogous to conventional antennae, nanoantennae hold the promise of transferring optical radiation to and from nanosized structures and devices. Light shining on ametallic nanoparticle can cause its electrons to oscillate in what is called a localized surface-plasmon resonance (LSPR). When two particles are close to each other, their dipole-like oscillations interact, creating a system analogous to the half-wave dipole antennae with a feed gap in the middle. Modern fabrication techniques let researchers create optical antenna systems with a desired resonance wavelength by controlling the particle size and shape, the distance between particles, and the choice of metal and host materials.1 LSPRs also exhibit large electromagnetic-field enhancements, with the largest enhancement, for coupled particles, in the antenna gap.2 We make optical nanoantennae using electron-beam lithography, vacuum deposition of gold, and lift off.3–5 The results are well-defined pairs of elliptical cylinders that are either regularly packed in an array, as show in in Figure 1, or isolated to permit study of a single pair. By selecting the geometry and host dielectric, we can choose the primary antenna resonance wavelength (for light polarized along the ellipses’ common axis) anywhere from the red through the near-IR. The resonance properties of optical nanoantennae have been mapped with subwavelength resolution. Illumination mode Figure 1. (a) Schematic top and side views of an optical nanoantenna sample, showing dimensions for two geometries. (b) and (c) Electron microscope images for geometries denoted G1 and G2." @default.
- W2053646890 created "2016-06-24" @default.
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- W2053646890 date "2008-01-01" @default.
- W2053646890 modified "2023-09-25" @default.
- W2053646890 title "Optical nanoantennae: bridging the far-field to the near-field" @default.
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- W2053646890 doi "https://doi.org/10.1117/2.1200805.1155" @default.
- W2053646890 hasPublicationYear "2008" @default.
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