2007/03/01 by S. Anantha Ramakrishna, Ramakrishna, S. Anantha, Sangeeta Chakrabarti +3
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #FOS: Physical sciences #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Photonic Crystals and Applications
paper · pdf · doi:10.48550/arxiv.physics/0703003
openalex publication_date 2007/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We demonstrate that arrays of split ring resonators (SRR) can have negative refractive index at optical frequencies (~1.4 eV). Our calculations reveal that the electric fields of radiation interact strongly with even symmetric SRR at optical frequencies as the size of the SRR becomes of the order of the wavelength (~lambda /3) for practicably realizable structures. We also demonstrate by calculations the focussing of a line source by a flat slab of a (2D) SRR medium. The negative refractive index here is related to the plasmonic excitations of the SRR and cannot be directly explained by the usual paradigm of negative dielectric permittivity and negative magnetic permeability in these limits when homogenization breaks down.