Open AccessExtraordinary optical transmission through metallic films perforated with aperture arrays having short-range order
Author(s) -
Amit Agrawal,
Tatsunosuke Matsui,
Z. Valy Vardeny,
Ajay Nahata
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.006267
Subject(s) - optics , materials science , superposition principle , reciprocal lattice , terahertz radiation , aperture (computer memory) , dielectric , transmission (telecommunications) , resonance (particle physics) , optoelectronics , diffraction , physics , electrical engineering , particle physics , quantum mechanics , acoustics , engineering
Using terahertz time-domain spectroscopy, we have measured the optical properties of metallic films perforated with arrays of subwavelength apertures that possess short-range order (SRO), but lack long-range orientational order (LRO). We demonstrate that extraordinary transmission enhancement still occurs through the SRO aperture structures, despite the absence of LRO. The dielectric response of these arrays is characterized by a superposition of a broad principal resonance that is due to the random rotations of the building block (BB) units, and discrete resonances arising from well-defined reciprocal vectors in the structure factor that result from a virtual lattice associated with the BB units.