Abstract
We theoretically explore the spectral behavior of the fundamental and sum-frequency waves generated from the surface of a thin metal film in the Kretschmann configuration with coherent ultrashort pulses. We show that the spectra of reflected sum-frequency waves exhibit pronounced shifts for the incident fundamental waves close to the plasmon coupling angle. We also demonstrate that the scale of discovered plasmon-enhanced spectral changes is strongly influenced by the magnitude of the incidence angle and the bandwidth of the source spectrum.
Highlights
Since the inception of the electromagnetic theory, we have witnessed enormous progress of how the newly invented tools could continue our incomplete biological evolution
X We found that at the incidence angle corresponding to light coupling to the surface plasmon, the spectral behaviors of reflected fundamental and sumfrequency waves (SFW) are totally different: the former has a spectral hole at the carrier frequency whereas the spectrum of the latter gets blue-shifted from the expected maximum
That at the incidence angle corresponding to light coupling to the surface plasmon, the reflected sum-frequency wave (SFW) spectrum gets blue-shifted from the expected maximum whereas the reflected fundamental wave (FW) has a spectral hole at the carrier frequency
Summary
Since the inception of the electromagnetic theory, we have witnessed enormous progress of how the newly invented tools could continue our incomplete biological evolution. Circuit theory, a simplified and practical version of Maxwell’s equations, triggered some of our greatest inventions – electronics and the computer; making use of electromagnetic energy allows us to communicate with people even on the other side of our planet, through radio or microwaves; we can interact with the molecular or atomic world easier – by firing scary high-power laser beams onto the matter, and seeing what will happen All these advances that we couldn’t imagine as hungry cavemen, remarkably extend the outreach of our brains and hands, cultivating a vivid society that is progressing to an even more advanced and sophisticated one. The area of plasmonics, young but rich in phenomena, has found more applications including much faster computer chips (into the 100 THz range) [4], high-resolution lithography and microscopy [5], organic light-emitting diodes [6], national security/environmental monitoring [7], medical drag delivery [8], full color holograms [9], and photovoltaic cells [10]
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