Abstract
When light propagates in matter it couples to optical excitations like optical phonons, electronic transitions, excitons etc. which leads to a polarization wave accompanying the electromagnetic wave. Quantization of this mixed propagating wave results in new quasi-particles called polaritons. We review here the general properties of polaritons like their dispersion relation and resulting optical properties in the Lorentz-oscillator model for (crystalline) matter including effects of anisotropy. We explicitly discuss the validity range of the polariton concept for different ratios of the distance of Lorentz oscillators and wavelength. Then we consider the consequences of coupling of the oscillators (i.e., spatial dispersion) for the dispersion, optical functions, and experimental spectra. Finally we introduce surface polaritons and their dispersion relation.
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Notes
- 1.
For electric quadrupole transitions, the matrix element varies linearly with \(\varvec{k}\). Compare (6.23), which has been truncated after the constant term for the dipole approximation.
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Problems
Problems
8.1
Which dispersion relations would you expect for the polariton resulting from oscillators with the dispersion relations of Fig. 7.2a, b? Do not forget that a finite coupling between photons and the oscillator necessarily implies a finite \(\Delta _{\text {LT}}\).
Check if you were right when you come to the chapters on phonon and on exciton polaritons.
8.2
Calculate the frequency shift a photon experiences when it is scattered off an atom in a backward direction. Compare with the homogenous linewidth of luminescence lines in semiconductor optics, which hardly fall below 0.1 meV.
8.3
Inform yourself about the possibility of cooling atoms by absorption and emission of photons.
8.4
What is the Mösbauer effect? How does it work?
8.5
In Na vapor it is possible to slow light down to an almost complete stop. Inform yourself with the help of some literature. Which effects apart from the extremely flat dispersion relation for large k-vectors contribute to this phenomenon?
8.6
Calculate the dispersion relation \(\omega (\varvec{k})\) from (8.7) for vanishing damping. What changes if \(\omega _0=\omega _0(\varvec{k})\) and/or if a small but finite damping \(\gamma \) are introduced?
8.7
Write down the equations of motion of two coupled harmonic oscillators and try to solve them. Find or imagine examples in classical physics and in quantum mechanical systems.
8.8
Which dependence of \(\Delta _{\text {LT}}(\varvec{k})\) do you expect for a transition that is dipole forbidden but allowed in quadrupole approximation?
8.9
Can you give an intuitive explanation as to why a photon with spin \(\pm \hbar \) can excite a quadrupole transition, e.g., from an atomic s state to a d (or s) state? Hint: Place the atom in the origin of the coordinate system and vary the impact parameter of the photon.
8.10
Sketch the dispersion of a polariton resonance with spatial dispersion and an oscillator strength which increases with \(\varvec{k}\). (Assume for simplicity zero damping). Does \(\Delta _{\text {LT}}\) then also depend on \(\varvec{k}\)?
8.11
Sketch the dispersion of the polariton for two close lying resonances A and B, with and without spatial dispersion for an order of the energies at \(\varvec{k}\,{=}\,0\) \(\hbar \omega ^A_0<\hbar \omega ^A_\text {L}< \hbar \omega ^B_0 <\hbar \omega ^B_\text {L}\). Is it possible for a single orientation of the polarization to have the sequence \(\hbar \omega ^A_0< \hbar \omega ^B_0<\hbar \omega ^A_\text {L} <\hbar \omega ^B_\text {L}\)?
8.12
Apart from the use of ATR methods see Sect. 21.1.5, it is possible to excite surface polaritons optically if a periodic structure, i.e., a grating, is formed at the interfaces. What is the principle behind this? Compare this with the statements about momentum conservation in Sects. 5.1.3 and 9.2.
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Kalt, H., Klingshirn, C.F. (2019). The Polariton Concept. In: Semiconductor Optics 1. Graduate Texts in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-24152-0_8
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