Andryieuski, Andrei

Gritti, Claudia

He, Q.

Jepsen, Peter Uhd

Lavrinenko, Andrei

Malureanu, Radu

Song, Z.

Zalkovskij, Maksim

Zhou, L.

We suggest a new possibility for obtaining a transparent metallic film, thus allowing for completely transparent electrodes. By placing a complementary composite layer on top of the electrode, we can cancel the back-scattering of the latter thus obtaining a perfectly transparent structure. For ease of fabrication, we performed the first experiments in the THz regime, but the concept is applicable to the entire electromagnetic waves spectrum. We show that the experiments and theory match each other perfectly

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Downloaded from orbit.dtu.dk on: Dec 20, 2017Transparent electrodes in the terahertz regime – a new approachMalureanu, Radu; Song, Z.; Zalkovskij, Maksim; Gritti, Claudia; Andryieuski, Andrei; He, Q.; Zhou, L.;Jepsen, Peter Uhd; Lavrinenko, AndreiPublication date:2013Link back to DTU OrbitCitation (APA):Malureanu, R., Song, Z., Zalkovskij, M., Gritti, C., Andryieuski, A., He, Q., ... Lavrinenko, A. (2013). Transparentelectrodes in the terahertz regime – a new approach. Paper presented at 4th International Conference onMetamaterials, Photonic Crystals and Plasmonics, META'13, Sharjah, United Arab Emirates.            Transparent electrodes in the terahertz regime – a new approach  R. Malureanu1, 3*, Z. Song2, 3, M. Zalkovskij1, 3, C. Gritti1, A. Andryieuski1, Q. He2, L. Zhou2, P. U. Jepsen1, A. V. Lavrinenko1 1 Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby 2800, Denmark ‎2 State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China 3 These authors contributed equally to the work *corresponding author: rmal@fotonik.dtu.dk  Abstract-We suggest a new possibility for obtaining a transparent metallic film, thus allowing for completely transparent electrodes. By placing a complementary composite layer on top of the electrode, we can cancel the back-scattering of the latter thus obtaining a perfectly transparent structure. For ease of fabrication, we performed the first experiments in the THz regime, but the concept is applicable to the entire electromagnetic waves spectrum. We show that the experiments and theory match each other perfectly.  Using the effective medium theory, the permittivity of a composite 2D layered material where the electric field is perpendicular to the layers is given by [1]:                            (1) Where   ,    are the widths of each material,         is the periodicity of the structure and   ,    are the permittivities of each layer. With the advent of the metamaterials field, at least one of the initial   values can be negative thus hugely expanding the range the composite material permittivity can reach. In this example, we defined the B layer as a metallic mesh with, in the THz regime; a permittivity         (     ⁄ )  and the A layer as a dielectric with a constant permittivity of 3.85. This resulted in a dielectric function of the composite material as:              (        )⁄ . The widths of the stripes were 10 and 30µm for the A and B layers respectively (see figure 1(a)) and   is the frequency in THz. Employing the standard transfer matrix method [2] and considering the C layer a uniform metallic mesh with  Figure 1. (a) the design considered for simulations; The A layer is silica, the B one is the composite mesh while the C is the electrode. The polarization is parallel to the y axis. (b) S-parameters results showing high transmittivity at 0.6THz         (     ⁄ )  we obtain, for a frequency of 0.6THz, perfect transmission through a complex structure placed on a Si substrate (see figure 1(b)). The simulated structures were fabricated using aligned optical lithography and thin layer depositions. The fabrication flow will be presented during the conference. Figure 2 shows the fabrication results for the C mesh as well as the AB complex layer. [3] The obtained experimental results are in almost perfect match with the predicted theory ones thus showing that our approach for designing such structures is viable. The experimental results as well as the challenges in measurements will be discussed during the conference. Acknowledgements, R.M., M.Z., A.L. wish to acknowledge the FTP THzCOW project for partial financial support. Z.Y.S, Q. H. and L. Z. thank the financial supports from NSFC (60990321, 11174055)), Program of Shanghai Subject Chief Scientist (12XD1400700) and MOE of China (B06011). A.A. acknowledges the Danish Council for Technology and Production Sciences for partial financial support via the FTP GraTer project.   REFERENCES 1. Bergman, D., “The dielectric constant of a composite material - a problem in classical physics,” Phys. Rep., Vol. 43, 377–407, 1978. 2. Busch, K., Chan, C. T., and Soukoulis, C. M., Photonic band gap materials, Kluwer, Dordrecht, 1996. 3. Malureanu, R., Zalkovskij, M., Song, Z., Gritti, C., Andryieuski, A., He, Q., Zhou, L., Jepsen, P. U., and Lavrinenko, A. V. “A new method for obtaining transparent electrodes” Opt.Exp., Vol. 20, 22770-22782, 2012  Figure 2. Fabricated structure showing high alignment accuracy and high quality of the structure. 

Transparent electrodes in the terahertz regime – a new approach

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Transparent electrodes in the terahertz regime – a new approach

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