Parametric decay of electromagnetic waves into two Langmuir oscillations near the quarter critical density is suggested as being attributable to an enhanced electric field and to surface-enhanced Raman scattering in near-field optics. A nanolayer of silver aggregates localizes the wave in the evanescent region to a one-wavelength span and results in a wave-number mismatch as well as in a reduced growth rate. The fastest-growing mode has a growth rate that scales with the square root of the nanolayer's thickness.
© 2004 Optical Society of America
(000.6800) General : Theoretical physics
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.5890) Nonlinear optics : Scattering, stimulated
(240.6680) Optics at surfaces : Surface plasmons
J. Y. Hsu, "Nanolayer parametric instability in near-field optics," Opt. Lett. 29, 2157-2159 (2004)