Terahertz axicone made of nanoporous SiO2
V.E. Ulitko1, G.M. Katyba1,2, G.A. Komandin2, I.E. Spector2, G.A. Emelchenko1, V.N. Kurlov1, V.M. Masalov1, K.I. Zaytsev2,3,4.
1Institute of Solid State Physics of RAS, Russia
2Prokhorov General Physics Institute of RAS, Russia
3Institute for Regenerative Medicine, Sechenov University, Russia
4Bauman Moscow State Technical University, Russia
Abstract
We have shown in the previous articles [1,2], that nanoporous SiO2, namely, artificial opals, are promising terahertz (THz) optical materials with no dispersion in the frequency range 0.1-2.5 THz, low absorption and quite a unique ability to vary the effective refractive index in a wide range (1.6-1.95) only by annealing. In this work, we fabricate THz axicone by direct sedimentation of the opal colloidal suspension into a mold. The axicone was dried and annealed in order to achieve higher refractive index. Next, we study fabricated axicone using a homemade THz imaging setup. Experimental results were compared with theoretical considerations. Obtained results show that artificial opals have a great potential for THz applications.
This work was partially supported by the Russian Science Foundation (RSF), Project # 22-72-10033.
[1] Ulitko, V.E. et. al. Nanoporous SiO2 based on annealed artificial opals as a favorable material platform of terahertz optics, Optical Materials Express, 10(9), 2100, 2020.
DOI:10.1364/OME.402185;
[2] Ulitko, V.E. et. al. Opal-based terahertz optical elements fabricated by self-assembly of porous SiO2 nanoparticles, Optics Express 29(9), 13764, 2021.
DOI:10.1364/OE.422637.
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Vladislav Ulitko
Institute of Solid State Physics of RAS
Russia
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