2015 MRS Spring Meeting, San Francisco, USA

<Poster Session : Z8-14>

Babinet Crosslink Meta-Atoms for Novel Electromagnetically Induced Transparency Analogue

Hyunseung Jung and Hojin Lee

Abstract

In this study, we propose a novel EIT analogue by using so-called Babinet crosslink meta-atoms (BCM) at terahertz frequencies. As a BCM unit cell, the two cut-wire (CW) structures and single complementary cut-wire (CCW) aperture are integrated into one meta-atom structure. According to Babinet principle, since the complementary structure has orthogonal polarization compared with its original structure, two CW patterns in the BCMs are oriented for the parallel polarization direction so that they exhibit a broad reflection band, whereas the CCW aperture in the BCMs is oriented for the perpendicular polarization direction so that it exhibits a sharp transmission band to produce EIT properties. By utilizing this EIT analogue, the proposed BCM structures can achieve extraordinary focus of incident wave and subsequently transmit it through the structural window in each meta-atom, whereas the conventional EIT analogues merely transmit the incident wave at their transmission peak. Measurement results verify that the maximum field amplitude and the quality factor of the BCMs are enhanced by 20 times and 1.3 times in comparison to those of the incident field and the conventional CCW apertures, respectively. Therefore, by using the proposed BCMs, we can expect to overcome the power loss problem of incident waves in the conventional EIT analogues. Moreover, based on this exceptional field enhancement property, the proposed BCMs are expected to be utilized for the exotic applications such as low-power bio-chemical sensing and imaging devices, slow light applications with higher spatial resolution, and phase hologram systems.