Electromagnetic near-field interactions of a dipolar emitter with metal and metamaterial nanoslabs
2011 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 84, no 3, 033849- p.Article in journal (Refereed) Published
We investigate the emission properties of a polarizable point dipole placed within a subwavelength distance from a silver or a slightly absorbing, negative-index metamaterial nanoslab. Using electromagnetic theory we show that in the immediate vicinity of the slab the dipole-slab interaction prevents the dipole from radiating. For the metamaterial slab close to the perfect-lens arrangement, the interaction is relatively weak and of short range. In particular, a region exists in the near zone of the metamaterial slab where the dipole emission is not disturbed by the interaction, and a bright intensity distribution of subwavelength width is created on the opposite side of the slab. This suggests that a low-loss metamaterial slab can act as a near-field imaging device which does not disturb the object. For the silver slab the interaction is stronger and it reaches over the near-field zone, adversely influencing the imaging capabilities in terms of brightness and resolution. The results are important for the development of metal and metamaterial superlenses.
Place, publisher, year, edition, pages
2011. Vol. 84, no 3, 033849- p.
negative refractive-index, silver superlens, diffraction limit, perfect lens, point-dipole, surface, light, microscopy, optics
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-43425DOI: 10.1103/PhysRevA.84.033849ISI: 000295216700022ScopusID: 2-s2.0-80053211059OAI: oai:DiVA.org:kth-43425DiVA: diva2:448501
QC 201110172011-10-172011-10-172011-10-17Bibliographically approved