META 2018 CONFERENCE, ROUND-TRIP MARSEILLE CRUISE, JUNE 24 – JULY 1, 2018 Carbyne Based Metasurfaces Stabilized with Metallic Nanoparticles Vladislav Samyshkin 1,2,3,4 , Yakov Galutin 1,2,3 , Stella Kutrovskaya 4 , Alexey Kucherik 4 , and Alina Karabchevsky 1,2,3* 1 1Electrooptical Engineering Unit, Ben-Gurion University, Israel 2 Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University, Israel 3 Center for Quantum Information Science and Technology, Ben-Gurion University, Israel 4 Stoletovs Vladimir State University, Russian Federation *corresponding author, E-mail: alinak@bgu.ac.il Abstract Carbyne is a linear carbon polymer. In a carbyne molecule, the carbon atoms are joined in chains by either triple or sin- gle bonds such as in polyene structure, or by constant dou- ble bonds such as in polycoumoulene structure. Here, we develop a metasurface deposition procedure in which we align carbyne structures on a surface. Our novel metasur- face based on linear carbon chains is expected to provide a solid platform for chip-scale devices. 1. Introduction Linear carbon chains are inherently unstable. One- dimensional carbon-based structures cannot maintain their state of matter. Therefore, to keep the chains stable during the deposition process, we applied an external electric field within the deposition area, which prevented the structures from curling up. This method allowed us to successfully deposit the carbyne on the substrate while maintaining the linearity of the chains. 2. Synthesis of carbyne in the liquid A colloidal solution was obtained by laser-ablating the tar- get immersed in a liquid. Shungite was used as the basis for the solution. For irradiation of the colloidal systems, a Ytterbium (Yb) fiber laser was used with a central fre- quency of 1.06 µm, pulse duration of 100 ns, repetition rate of 20 KHz and pulse energy up to 1 mJ. The laser radiation was focused into the volume of the colloid with a spot di- ameter of 50 µm, the scan rate varied from 1 to 10 mm/s. The irradiation time varied from 5 to 15 minutes. Dur- ing the laser exposure, we observed the colloidal systems clearing up and lighten as shown in Figure 1. Characteriza- tion by a laser particle size analyzer (Horiba LB-550) shows the particle diameter variation with the exposure time. We found that the particle size distribution becomes bimodal with time. This indicates that particle aggregation occurs in addition to the particle fragmentation. However, the aver- age particle diameter in a colloidal system decreases with increasing the exposure time. In general, this behavior of colloidal systems is consistent with typical mechanisms of laser fragmentation of liquid systems [1, 2]. Figure 1: Colloidal systems before and after the laser expo- sure. Left to right: the original system, after irradiation for: 5, 10 and 15 minutes, respectively. To obtain the carbyne-based structures, we first pre- pared a gold-based colloidal solution that was mixed with the carbon-based colloidal solution. The second step was to irradiate the mixture for 15 minutes. We analyzed the colloidal solution using Raman spec- troscopy as shown in Figure 2. The carbyne structure is most clearly isolated in the spectral range of 4690-5200 nm [3, 4]. The valence vibrations of the triple carbon bonds (C ≡ C) corresponding to the polyinic carbyne structure are reflected by bands in the range of 4750-5250 nm [5, 6]. In accordance with ref. [7], the band of nm corresponds to the vibrational modes of ideal poly-linear chains, hence the shift of this peak to the short-wave region is explained by the change in the length of the chain. Figure 2: Raman spectrum of carbyne.