Abstract
The effect of surface roughness on the response of metals to electromagnetic fields has been under investigation since the turn of the century when R. W. Wood1 observed an “anomalous” optical absorption by thin alkali metal films, which he attributed to their granular structure. Until fairly recently, the focus of the investigations has been almost entirely on the effect of surface roughness on the linear optical response of metals, e.g., the reflection, absorption, and elastic scattering of EM radiation, the coupling of EM radiation with surface EM waves, and photoemission by metals. There was some speculation about the possible effect of surface roughness on second-harmonic generation by metals5 but, until very recently, no experimental study of this effect had been carried out. The observation of a “giant” enhancement (~106) of the Raman scattering by molecules adsorbed on a Ag electrode6,7 and the corresponding large enhancement of the inelastic light scattering by rough metal surface8–10 has provided further impetus to the investigation of the role of surface roughness in non-linear, as well as linear, optical phenomena. The observation of light emission in inelastic electron tunneling between metals is another recently observed optical phenomenon in which surface roughness plays a crucial role.11–13
Guggenheim Fellow (1980–81) and Chalmers University of Technology One Hundred and Fifthieth Anniversary Professor of Physics (Spring 1981).
Research supported in part by ONR and NSF.
Research supported in part by AFOSR.
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References
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Burstein, E., Lundqvist, S., Mills, D.L. (1982). The Roles of Surface Roughness. In: Chang, R.K., Furtak, T.E. (eds) Surface Enhanced Raman Scattering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9257-0_4
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