Theoretical realization of robust broadband transparency in ultrathin seamless nanostructures by dual blackbodies for near infrared light
2013 (English)In: Nanoscale, ISSN 2040-3364, Vol. 5, no 8, 3373-3379 p.Article in journal (Refereed) Published
We propose a counter-intuitive mechanism of constructing an ultrathin broadband transparent device with two perfect blackbodies. By introducing hybridization of plasmon modes, resonant modes with different symmetries coexist in this system. A broadband transmission spectrum in the near infrared regime is achieved through controlling their coupling strengths, which is governed by the thickness of high refractive index layer. Meanwhile, the transparency bandwidth is found to be tunable in a large range by varying the geometric dimension. More significantly, from the point view of applications, the proposed method of achieving broadband transparency can perfectly tolerate the misalignment and asymmetry of periodic nanoparticles on the top and bottom, which is empowered by the unique dual of coupling-in and coupling-out processes within the pair of blackbodies. Moreover, roughness has little influence on its transmission performance. According to the coupled mode theory, the distinguished transmittance performance is physically interpreted by the radiative decay rate of the entire system. In addition to the feature of uniquely robust broadband transparency, such a ultrathin seamless nanostructure ( in the presence of a uniform silver layer) also provides polarization-independent and angle-independent operations. Therefore, it may power up a wide spectrum of exciting applications in thin film protection, touch screen techniques, absorber-emitter transformation, etc.
Place, publisher, year, edition, pages
2013. Vol. 5, no 8, 3373-3379 p.
Extraordinary Optical-Transmission, Subwavelength Hole Arrays, Nanohole Arrays, Plasmon, Nanoparticles, Absorption, Resonance, Metamaterials, Hybridization, Apertures
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-122129DOI: 10.1039/c3nr34278fISI: 000316959500036ScopusID: 2-s2.0-84880897862OAI: oai:DiVA.org:kth-122129DiVA: diva2:621169
QC 201305142013-05-142013-05-132013-05-14Bibliographically approved