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By Heinz Raether
The ebook stories the homes of floor plasmons that depict electromagnetic floor waves or floor plasma polaritons. Their propagation on tender and corrugated surfaces (with tough or grating profiles) is taken into account. within the latter case, the corrugations may cause robust coupling of the skin plasmons with photons resulting in resonances with a robust enhancement of the electromagnetic box within the floor. Coupling and box enhancement are the main admired phenomena on corrugated surfaces and result in various very important functions. recognition has been concerned about the reason of the physics. to maintain the textual content readable, refined calculations were kept away from, and as a substitute a variety of functions facing superior gentle emission, nonlinear optics, SERS, and different instances of curiosity are mentioned.
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Additional info for Surface Plasmons on Smooth and Rough Surfaces and on Gratings
Sample text
4ooo 1 60 ~ " BOOO S oo 90 ~ Fig. The ratio Z(@ -- 9 0 ~ 1 6 2 = 0 o) at r = 90 ~ or 4 / I , , is plotted as function of 0, measured against the z direction, for surface (s) and volume (v) scattering at different wavelengths. The experimental data agree with the surface scattering concept confirming that (nonradiative) SPs are responsible for a light emission. 21]. The experimental results demonstrated that the nonradiative SPs interact with surface roughness. Volume Roughness and Radiative SPs The dispersion relation of the radiative SPs lies left of the light line, see Fig.
S]. These experiments demonstrated, that a) b) c) the excitation of SPs on a thin metal film in direct contact with the glass prism produces an ATR minimum; the SPs propagating on a rough surface radiate light into the air space of a Lorentzian shape by SP-photon coupling; and the strong light intensity in the resonance case indicates a strong electromagnetic field in the boundary air/metal (field enhancement). In Fig. 2a the enhanced radiation is registered: it displays the intensity maxima at different wavelengths reflecting thus the dispersion relation.
The back-scattered light, right side of the curve, is determined by the roughness of the silver surfeme. 1] T h e slope yields a a n d the linear e x t r a p o l a t i o n to Akx = 0 gives 5. 12]. 1. T h e s t r o n g f o r w a r d scattering at A k x E 1 X 10 - 3 / ~ - 1 which shows an int e n s i t y v a r y i n g w i t h the s u b s t r a t e is remarkable. 1. 1]. This has been interpreted as due to a waviness of the fire-polished quartz plates which serve as a substrate and which may be caused by the production process.