Abstract
Using transmission and reflection measurements under normal incidence in one and three layers of a mum-scale metamaterial consisting of pairs of short-slabs and continuous wires, fabricated by a photolithography procedure, we demonstrate the occurrence of a negative refractive index regime in the far infrared range, ~2.4-3 THz. The negative index behavior in that system at ~2.4-3 THz is further confirmed by associated simulations, which are in qualitative agreement with the experimental results.
Highlights
Left-handed or negative index metamaterials (LHMs), i.e. artificial materials that exhibit both negative effective electrical permittivity, ε, and magnetic permeability, μ, over a common frequency band [1,2], and negative index of refraction, n, [1] have received recently a lot of attention due to their interesting electromagnetic (EM) properties, which create new perspectives for the manipulation of electromagnetic waves
Using transmission and reflection measurements under normal incidence in one and three layers of a μm-scale metamaterial consisting of pairs of short-slabs and continuous wires, fabricated by a photolithography procedure, we demonstrate the occurrence of a negative refractive index regime in the far infrared range, ~2.4-3 THz
It is for that reason that in most of the THz experiments [18,19,20], transmission measurements have been performed for propagation normal to the SRRs plane, and the occurrence of resonant magnetic behavior has been concluded indirectly, through the effect of electric excitation of the magnetic resonance (EEMR), i.e. excitation of the resonant circular currents in the SRR by the incident electric field [25, 26]
Summary
Left-handed or negative index metamaterials (LHMs), i.e. artificial materials that exhibit both negative effective electrical permittivity, ε, and magnetic permeability, μ, over a common frequency band [1,2], and negative index of refraction, n, [1] have received recently a lot of attention due to their interesting electromagnetic (EM) properties, which create new perspectives for the manipulation of electromagnetic waves (negative refraction [3,4,5], evanescent wave amplification, perfect lensing [6] etc). The short-slab pairs arrangement (with or without continuous wires) has obvious advantages compared to the conventional SRR plus wires design: It is simpler in fabrication and, LH behavior can be achieved for incidence normal to the short-slab pairs plane, enabling the observation of negative index behavior with only a few, if one, short-slab pairs layer. The latter feature could facilitate the realization and characterization of high-frequency LH metamaterials. It should be noted that three layers of the metamaterial have been fabricated, unlike the usual one layer approach
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
