Extremely large extinction efficiency and field enhancement in terahertz resonant dipole nanoantennas
Razzari, et.al. >From the abstract: .". demonstrating a metal nanostructure in shape of a dipole nanoantenna, which can efficiently resonate at terahertz frequencies, showing an effective cross section >100 times larger than its geometrical area, and a field enhancement factor of ~280, confined on a lateral section of ~λ/1,000." More comments later. -Mark From: Mark Iverson-ZeroPoint [mailto:zeropo...@charter.net] Sent: Tuesday, January 03, 2012 1:27 PM To: vortex-l@eskimo.com Subject: [Vo]:Nickel nanoantennas... its all about resonances. More evidence that we are dealing with oscillations and need to look at whether there are any harmonic relationships within the H-loaded Ni lattice, plasmons, deflated H, inverse Rydbergs, magnetic effects, etc. Note the statement, ".a strong magnetic behavior", and that "the oscillations are aligned along the polarization direction of the incident light". These are the kinds of unusual coherences that one never encounters in bulk matter, thus, all existing theoretical foundations have not had to incorporate them. Since these highly unusual coherences are not taken into consideration, theorists have concluded that the effects from these unusual arrangements are "not possible". It could very well be that current theoretical models wouldn't even be able to accurately model these unusual conditions. Caption from the cover: "The cover shows the near-field amplitude image of dipolar plasmon modes in nickel nanodisks. Each disk exhibits two bright spots oscillating along the polarization direction of the incident light, revealing the enhanced near-field at the rims of the nickel disks. The image was recorded by a scattering-type scanning near-field microscope (s-SNOM) within a study of the optical and magnetic properties of nickel nanostructures. An interesting dual functionality is observed: a strong magnetic behavior is identified together with a clear plasmonic response, which could be a useful building block for future biotechnological and optoelectronic applications, where active control of the functional components is required. For more information, please read the Full Paper "Plasmonic Nickel Nanoantennas" by R. Hillenbrand and co-workers" -Mark Iverson
