Abstract
In the last chapter we have discussed surface plasmons. These are coherent charge oscillations at the interface between a metal and a dielectric, which can be excited optically and propagate along the interface. They come along with evanescent electromagnetic fields, which decay exponentially when moving away from the interface. In this chapter we analyze metallic nanoparticles embedded in dielectrics and show that corresponding excitations exist there, which we will denote as particle plasmons. We start our discussion with nanoparticles much smaller than the wavelength of light, where the quasistatic approximation can be employed, and generalize the results later for larger particles.
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Notes
- 1.
The resulting condition ε 1ℓ = −ε 2(ℓ + 1) can neither be fulfilled for dielectric particles with ε 1 > 0, ε 2 > 0 nor for metallic particles with a permittivity that has a non-zero imaginary part.
- 2.
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Hohenester, U. (2020). Particle Plasmons. In: Nano and Quantum Optics. Graduate Texts in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-30504-8_9
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DOI: https://doi.org/10.1007/978-3-030-30504-8_9
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